Short Answer

Anthropic's market share is expected to remain above 2.25% this week, supported by its historical presence despite a Q3 2026 downward trend from competitive pricing, with the market pricing this at 95.0%.

1. Market Behavior & Drivers

The market's low valuation appears driven by reports of shifting momentum in the enterprise AI space. Data from early Q3 2026 indicates that while Anthropic maintains a lead in enterprise adoption at 43.5%, OpenAI is closing the gap at 39.7%. News that OpenAI's growth is accelerating, driven by adoption of its GPT-5.6 Sol model, is the primary negative catalyst reflected in the contract's price.
The sharp drop from an opening of 6.0% to the current 1.0% level suggests traders are pricing in a high likelihood that OpenAI's momentum will continue, eroding Anthropic's position. The market consensus, supported by over 5,100 contracts traded, is that Anthropic's market share is unlikely to meet the threshold required for a YES resolution. This sentiment is based on the reported Q3 dynamics from sources tracking company spending.
  • Anthropic's share likely holds above 2.25%, supported by mid-2026 OpenRouter data.
  • Q3 2026 downward trend reduces higher share likelihood due to competitive pricing.

Current Context

Anthropic holds an enterprise lead despite recent competitive shifts. As of early Q3 2026, Anthropic led the enterprise AI market with approximately 43.5% of company adoption among Ramp-tracked businesses, compared to OpenAI's 39.7% [1][2]. While Anthropic maintained an overall lead in enterprise adoption, OpenAI demonstrated faster growth momentum during Q3 2026, driven by the adoption of its GPT-5.6 Sol model among developers and enterprise users [1][3][2]. Anthropic's Fable 5 models faced headwinds in enterprise adoption due to pricing and data-retention policy concerns, contributing to OpenAI's recent momentum in the sector [2][4]. Anthropic also holds a significant lead in enterprise LLM API spend, with a reported 40% share versus OpenAI's 27% based on Menlo Ventures data from late 2025 [5][6][7]. In early 2026, Anthropic’s usage share was 32%, ahead of OpenAI's 25% and Google's 20% [8][9][10].
OpenAI dominates the consumer market, Anthropic shows niche strength. In the consumer market, OpenAI's ChatGPT remains the dominant force, holding approximately 51.5%–55.5% of global chatbot web traffic as of September 2026 [11][4][12]. Anthropic's Claude accounted for approximately 9.3%–10.3% of this traffic [11][4][12]. In the broader consumer AI assistant market as of mid-2026, Claude is positioned in the third tier of platform usage, with roughly 34% of users reporting usage in the past month and a primary platform share of about 7% [13]. On the OpenRouter platform in late May 2026, Anthropic captured approximately 42% of platform revenue, despite representing about 11% of token share, reflecting its premium pricing strategy [14].
Market competition is evolving amidst high-stakes financial events. Broader market concentration in LLM inference services has declined, with the four-firm concentration ratio (CR4) dropping to approximately 81% by 2026 [15]. Prediction markets on Kalshi have set the odds at 95% for Anthropic's OpenRouter text market share exceeding 2.25% for the week of September 8, 2026 [16]. Hyperscalers exhibit significant dependency on both Anthropic and OpenAI [17]. The march to anticipated initial public offerings continues for both companies [18], with Salesforce deepening its partnership with Anthropic PBC [19].
Sources (19)
  1. 1Anthropic And OpenAI Enterprise AI Market Share Dynamics Shift In Q3 2026ainvest.com
  2. 2OpenAI vs Anthropic Business AI Spending: Ramp Q3 2026 Datathrumos.com
  3. 3OpenAI is gaining on Anthropic with business users, new data...techcrunch.com
  4. 4Top Generative AI Chatbots by Market Share – September 2026 – First Page Sagefirstpagesage.com
  5. 540% Enterprise LLM — Anthropic Passes OpenAIvalueaddvc.com
  6. 6LLM Statistics 2026: Market Size, Market Share, and Why the Two Leaders Are Different Companies - Axis Intelligenceaxis-intelligence.com
  7. 7LLM Market Report 2026: Anthropic vs. OpenAI vs. Google - The AI Indexreport-ai.org
  8. 8The Inference Bottleneck: A Formal Model of Vertical Foreclosure in AI Marketsarxiv.org
  9. 9https://arxiv.org/pdf/2604.17431arxiv.org
  10. 10The Inference Bottleneck: A Formal Model of Vertical Foreclosure in AI Marketsarxiv.org
  11. 11AI and LLM Market Share 2026: Users, Trends, Regionsdiploria.ai
  12. 12ChatGPT claws back web traffic share to 55.5 percent as Gemini's brief comeback fadesthe-decoder.com
  13. 13Platform Choice, Trust, and Privacy in the Consumer AI Assistant Marketarxiv.org
  14. 14Memory Scarcity, Open Models, and the Restructuring of the AI Industry, 2026–2030 A quantitative scenario analysis of inference economics, training-cost divergence, and infrastructure solvencyarxiv.org
  15. 15Tiered Super-Moore’s Law: Price Evolution, Production Frontiers, and Market Competition in Large Language Model Inference Servicesarxiv.org
  16. 16Anthropic market share this week - Kalshi Odds | CoinRithmcoinrithm.com
  17. 17AI’s Achilles’ Heel: Why Everything Hinges on Anthropic & OpenAI | The Weekly Wrapyoutube.com
  18. 18Anthropic Finalizing $15 Billion Pre-IPO Credit Facility | Bloomberg Intelligenceyoutube.com
  19. 19Salesforce Jumps Most Since 2020 on Outlook, Anthropic Deal | Bloomberg Intelligenceyoutube.com

2. Price Chart

Historical Price (Probability)

Outcome probability
Date

3. Significant Price Movements

Notable price changes detected in the chart, along with research into what caused each movement.

Outcome: Above 2.75%

📉 September 09, 2026: 57.0pp drop

Price decreased from 87.0% to 30.0%

What happened: The web research indicates that a 57.0 percentage point drop is not associated with the "Anthropic market share this week" prediction market. Instead, this specific movement is linked to unrelated political prediction markets concerning US-Iran diplomatic meetings from April 2026 [1]. Therefore, based on the provided information, no primary driver for the stated Anthropic market share price movement can be identified. Social media was irrelevant, as the reported movement is not evidenced for this market.

Outcome: Above 2.25%

📈 September 08, 2026: 89.0pp spike

Price increased from 6.0% to 95.0%

What happened: Based on the provided research, there is no evidence of an 89.0 percentage point market share spike for Anthropic on September 08, 2026, nor is a 2.25% market share threshold relevant to this date [2][3][4]. While Anthropic holds a significant share in enterprise LLM spend (approximately 40%) and has shown growth in its API market share [5][6][7][8][9][10], these are long-term trends, not a sudden, massive daily movement. Without evidence that the described market movement occurred, identifying a primary driver, including social media activity, is not possible.
Sources (10)
  1. 1US–Iran meeting odds collapse as Islamabad talks pause; US blockadeglobal-political-spotlight.com
  2. 2Is Misinformation More Open? A Study of robots.txt Gatekeeping on the Webarxiv.org
  3. 3[PDF] Is Misinformation More Open? A Study of robots.txt Gatekeeping on...arxiv.org
  4. 4https://arxiv.org/pdf/2601.02430arxiv.org
  5. 5Anthropic And OpenAI Enterprise AI Market Share Dynamics Shift In Q3 2026ainvest.com
  6. 6Anthropic Now Takes 40% of Enterprise LLM Spend - Value Add VCvalueaddvc.com
  7. 7LLM Statistics 2026: Market Size, Market Share, and Why the Two Leaders Are Different Companies - Axis Intelligenceaxis-intelligence.com
  8. 8OpenAI vs Anthropic Business AI Spending: Ramp Q3 2026 Datathrumos.com
  9. 9LLM Market Report 2026: Anthropic vs. OpenAI vs. Google - The AI Indexreport-ai.org
  10. 10A Formal Model of Vertical Foreclosure in AI Markets - arXivarxiv.org

4. Market Data

Contract Snapshot

For the "Above 2.6%" contract, a YES resolution occurs if Anthropic's market share for "this week" is determined to be greater than 2.6%. Conversely, a NO resolution occurs if their market share for "this week" is 2.6% or less. The market begins on Sunday, September 13, 12:00 am EDT, with a listed maximum payout date of September 13, 2026; however, no specific settlement conditions or data sources for determining market share are detailed in the provided content.

Market Discussion

As of September 2026, Anthropic holds an approximate 40-43.5% share of the enterprise AI market, having also led the enterprise LLM API market with 32% usage share in April 2026 [1][2][3][4][5][6]. While prediction markets in early September 2026 show strong sentiment favoring Anthropic as the current leader in frontier model performance, critics suggest its premium pricing and 'Fable 5.1' release are struggling to maintain market share against more efficient and lower-cost rivals [7][8][9][10][11]. Furthermore, in the consumer AI assistant market, Claude held approximately 7% of primary platform usage in mid-2026, significantly trailing competitors [12].

Sources (12)
  1. 1Anthropic And OpenAI Enterprise AI Market Share Dynamics Shift In Q3 2026ainvest.com
  2. 240% Enterprise LLM — Anthropic Passes OpenAIvalueaddvc.com
  3. 3LLM Statistics 2026: Market Size, Market Share, and Why the Two Leaders Are Different Companies - Axis Intelligenceaxis-intelligence.com
  4. 4LLM Market Report 2026: Anthropic vs. OpenAI vs. Google - The AI Indexreport-ai.org
  5. 5A Formal Model of Vertical Foreclosure in AI Markets - arXivarxiv.org
  6. 6https://arxiv.org/pdf/2604.17431arxiv.org
  7. 7Which company has the best AI model end of September?polymarket.com
  8. 8The Best AI Model Race in 2026: What a $1M Polymarket Bet Reveals About Where AI Is Heading | AdTools.orgadtools.org
  9. 9Best AI Model Company Sep 2026 Odds | Polymarket & Kalshipredictmarketcap.com
  10. 10OpenAI just nuked Anthropic's Fable 5.1 launch. By a landslide. It's not funny. | Dominik Lambersylinkedin.com
  11. 11Anthropic AI Models Losing Market Share to Cheaper Rivalsai-newspaper.com
  12. 12Platform Choice, Trust, and Privacy in the Consumer AI Assistant Marketarxiv.org

5. Trust Index

This scorecard was computed Sep 13, 2026 and may not reflect current market conditions.

Octagon Trust Index Kalshi 79 Good
How it adds up
Integrity80% of score84Good
Trade quality20% of score56Caution
Trust score79Good

Weighted blend with hard caps — a critically weak safety pillar, or a severe trading anomaly, caps the total regardless of the rest. Full methodology · About the Trust Index

Trust profile
Integrity4 screens run · 6 don't apply
Market integrity
84Good

Outcome is hard to influence

No suspicious activity on any screen

Screened clean
Large tradesNo single trade dominates the tape. Clear
Thin-volume movesMoves carried volume Clear
Size patternsNo distribution read Clear
2 screens not run
Outcome control · doesn't apply to this market type
Thin-leg conviction · doesn't apply to this market type
Info fairness
80Good

Structural prior — no screens apply

No suspicious activity on any screen

Screened clean
Information exposureNo concentrated group can know the outcome materially early. Clear
4 screens not run
Move vs. catalyst · doesn't apply to this market type
Longshot repricing · doesn't apply to this market type
Pre-broadcast certainty · doesn't apply to this market type
Cross-venue timing · doesn't apply to this market type
Resolution quality
92Strong

Resolution mechanism is dependable

No suspicious activity on any screen

Resolution rules read: Clear

Liquidity
40Thin

Expect slippage beyond small size

9 contracts · worst first

Above 2.6%5
Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Above 2.75%5
Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Above 2.85%5
Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Above 3.1%5
Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Above 3.25%5
Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Above 3.45%5
Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Above 2.95%14
Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Above 2.25%65
Tradeable · low confidence

Scored from 24h activity alone — realized cost unmeasurable (capped at 65)

Above 2.45%79
Tradeable · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
48Mixed

Some moves lacked volume

9 contracts · worst first

Above 2.45%26
Unconfirmed · high confidence

Unconfirmed move — light volume and/or it has partly reverted.

Above 2.6%81
Confirmed · high confidence

Volume confirms the move over 6h

Above 2.75%86
Confirmed · high confidence

Volume confirms the move over 6h

Above 3.25%89
Confirmed · high confidence

Volume confirms the move over 6h

Above 2.95%91
Confirmed · high confidence

Volume confirms the move over 6h

Above 3.45%94
Confirmed · medium confidence

Volume confirms the move over 24h

Above 2.25%—
No significant move (6h)

Price was stable over the last 6 hours.

Above 2.85%—
No significant move (6h)

Price was stable over the last 6 hours.

Above 3.1%—
No significant move (6h)

Price was stable over the last 6 hours.

Rule clarity
100Clear

Counts toward Resolution quality, not here

9 contracts · worst first

Above 2.25%100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 2.45%100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 2.6%100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 2.75%100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 2.85%100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 2.95%100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 3.1%100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 3.25%100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 3.45%100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Trade quality
56Caution

Tradable, but expect execution cost beyond small sizes.

Outcome quality 56 (notional-weighted across 9 scored legs)

Above 2.25%65Market scoreLiquidity65Move quality–Rule clarity100
Why 65
Liquidity
65 · Tradeable · low confidence

Scored from 24h activity alone — realized cost unmeasurable (capped at 65)

Move quality
No significant move (6h)

Price was stable over the last 6 hours.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 2.45%79Market scoreLiquidity79Move quality26Rule clarity100
Why 79
Liquidity
79 · Tradeable · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
26 · Unconfirmed · high confidence

Unconfirmed move — light volume and/or it has partly reverted.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 2.6%5Market scoreLiquidity5Move quality81Rule clarity100
Why 5
Liquidity
5 · Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
81 · Confirmed · high confidence

Volume confirms the move over 6h

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 2.75%5Market scoreLiquidity5Move quality86Rule clarity100
Why 5
Liquidity
5 · Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
86 · Confirmed · high confidence

Volume confirms the move over 6h

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 2.85%5Market scoreLiquidity5Move quality–Rule clarity100
Why 5
Liquidity
5 · Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
No significant move (6h)

Price was stable over the last 6 hours.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 2.95%14Market scoreLiquidity14Move quality91Rule clarity100
Why 14
Liquidity
14 · Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
91 · Confirmed · high confidence

Volume confirms the move over 6h

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 3.1%5Market scoreLiquidity5Move quality–Rule clarity100
Why 5
Liquidity
5 · Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
No significant move (6h)

Price was stable over the last 6 hours.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 3.25%5Market scoreLiquidity5Move quality89Rule clarity100
Why 5
Liquidity
5 · Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
89 · Confirmed · high confidence

Volume confirms the move over 6h

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Above 3.45%5Market scoreLiquidity5Move quality94Rule clarity100
Why 5
Liquidity
5 · Very thin · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
94 · Confirmed · medium confidence

Volume confirms the move over 24h

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear

underwriting_v1.4 · computed Sep 13, 2026

6. How do Anthropic's Fable 5 and OpenAI's GPT-5.6 Sol compare on developer-centric metrics like pricing, performance, and adoption rates in Q3 2026?

GPT-5.6 Sol Input Token Cost$4-$5 per million input tokens (Q3 2026) [1][2][3][4]
Claude Fable 5 Output Token Cost$50 per million output tokens (Q3 2026) [1][2][3][4]
Preferred for Complex CodingClaude Fable 5 [2][5][3][4]
GPT-5.6 Sol proves more cost-effective, driving higher adoption in Q3 2026. OpenAI's GPT-5.6 Sol is notably more cost-effective, priced at $4-$5 per million input tokens and $20-$30 per million output tokens. This is considerably cheaper compared to Anthropic's Claude Fable 5, which costs $10 per million input tokens and $50 per million output tokens [1][2][3][4]. This favorable pricing, combined with superior efficiency and its integration into widely used platforms, contributes to GPT-5.6 Sol's greater adoption momentum among developers. Conversely, Fable 5 faces challenges largely due to its higher operational cost and occasional service interruptions [3][4][6].
GPT-5.6 Sol leads general benchmarks, but Fable 5 excels in critical coding. Despite GPT-5.6 Sol performing better on general benchmarks such as Terminal-Bench 2.1, Claude Fable 5 distinguishes itself in specific applications [2][5]. Developers often prefer Fable 5 for complex, correctness-critical coding tasks, where it consistently demonstrates higher code quality in practical application benchmarks [2][5][3][4]. Consequently, Claude Fable 5 is frequently deployed as a specialized "safety net" or for high-stakes, long-horizon agentic workflows, leveraging its unique strengths [3][4].
Sources (6)
  1. 1GPT-5.6 Sol Model | OpenAI APIdevelopers.openai.com
  2. 2GPT-5.6 Sol vs Claude Fable 5 — Real head-to-head AI model comparison on 47 tasks · Goldie Benchgoldiebench.com
  3. 3Claude Fable 5 vs GPT-5.6 Sol (2026): The Definitive Frontier Model Showdownaitoolsrecap.com
  4. 4GPT-5.6 vs Fable 5 Review: Which One You Pick Depends on These Factors - Decryptdecrypt.co
  5. 5Fable 5 vs GPT-5.6 Sol - Expoexpo.dev
  6. 6Claude Fable - Anthropicanthropic.com

7. What potential product launches or pricing changes from Anthropic or OpenAI in late Q3 2026 could significantly alter their market shares on OpenRouter?

OpenAI Q3 2026 API spend growth82% [1][2]
Anthropic Q3 2026 API spend growth76% [1][2]
Anthropic OpenRouter market share (Sept 8, 2026 prediction)2.75%-3.5% [3][4]
Anthropic's market share on OpenRouter has recently declined. In Q3 2026, its token-based market share on OpenRouter has been decreasing as cost-sensitive users increasingly gravitate towards more affordable open-weight and Chinese AI models [1][5]. OpenAI, by contrast, demonstrated stronger API spend growth, rising 82%, largely due to the success of its GPT-5.6 Sol model. During the same period, Anthropic's Fable 5 model struggled with adoption and regulatory restrictions, contributing to its lower growth of 76% [1][2]. OpenRouter, acquired by Stripe for $7.5 billion in August 2026, is characterized by intense pricing competition [2][6].
Anthropic faces low market share predictions without new product details. Prediction markets for the week of September 8, 2026, indicate low expectations for Anthropic's market share on OpenRouter, with betting probabilities concentrating on a token-based share in the 2.75%-3.5% range [3][4]. The available information details current market dynamics and anticipated market share but does not include any potential new product launches or pricing adjustments from either company that could alter these trends in late Q3 2026.
Sources (6)
  1. 1OpenAI vs Anthropic: Q3 API spend growth comparison - Facebookfacebook.com
  2. 2[AINews] Stripe buys OpenRouter for $7B - Latent.Spacelatent.space
  3. 3Anthropic market share this week Odds & Predictions 2026 - Kalshikalshi.com
  4. 4Anthropic market share this week Odds | Kalshi & Polymarketpredictmarketcap.com
  5. 5Chinese AI Models Top OpenRouter; Claude at 13.3% [2026]tech-insider.org
  6. 6Report: OpenRouter Business Breakdown & Founding Storyresearch.contrary.com

8. What underlying OpenRouter data from mid-2026 supports the high market consensus for Anthropic's text share exceeding 2.25%?

Anthropic's OpenRouter Token Share14.8% (June 2026) [1][2]
Prediction Market Share Thresholds3.0% to 5.5% (August-September 2026) [3][4][5][6]
Chinese-Origin Models' OpenRouter ShareOver 45% (by April 2026) [7][1][8]
OpenRouter data from mid-2026 confirmed strong market consensus for Anthropic's share. The data demonstrated Anthropic's actual performance on the platform, aligning with high expectations for its text share. In June 2026, Anthropic secured a 14.8% share of weekly token volume on OpenRouter, positioning it as the second-highest among all model laboratories [1][2]. This substantial share provides a solid basis for the sustained confidence observed in various prediction markets.
Prediction markets consistently projected Anthropic's share above 2.25 percent. Platforms like Kalshi routinely set 'Anthropic market share' thresholds significantly higher, frequently testing between 3.0% and 5.5% throughout August and September 2026 [3][4][5][6]. These market share metrics from OpenRouter are derived from real-time API token usage across its platform, encompassing both prompt and completion tokens [9][10][2]. This comprehensive measurement serves as a reliable proxy for broader developer and application usage.
The broader AI market also experienced significant shifts by mid-2026. This period saw the notable rise of Chinese-origin models, including DeepSeek, Xiaomi, and MiniMax, which collectively captured over 45% of OpenRouter traffic by April 2026 [7][1][8].
Sources (10)
  1. 1OpenRouter's Real AI Rankings: DeepSeek Dominates, Chinese...pro.stockalarm.io
  2. 2LLM Rankings - OpenRouteropenrouter.ai
  3. 3Anthropic market share this week Odds | Kalshi & Polymarketpredictmarketcap.com
  4. 4Anthropic market share this week Odds & Predictions 2026 - Kalshikalshi.com
  5. 5Anthropic Market Share Aug 17 2026 Odds | Kalshi & Polymarketpredictmarketcap.com
  6. 6Anthropic market share this week - Probabilidades na Kalshi | CoinRithmcoinrithm.com
  7. 7OpenRouter Rankings April 2026: Top AI Models by Datadigitalapplied.com
  8. 8Token Market Share by Lab - Diracdirac.run
  9. 9State of AI:An Empirical 100 Trillion Token Study with OpenRouterarxiv.org
  10. 10State of AI 2025: 100T Token LLM Usage Study | OpenRouteropenrouter.ai

9. How is 'text market share' defined and measured by OpenRouter, the likely source for this market's resolution?

OpenRouter 'text market share' definitionCalculated by volume of prompt and completion tokens, aggregated daily in UTC buckets [1][2][3]
Prediction market resolution basisBased on OpenRouter's 'Market Share' view, calculated weekly by model author or company [3][4][5]
Scope of OpenRouter metricReflects developer activity solely within OpenRouter's ecosystem, not the global AI market [1][6][7][2]
OpenRouter defines "text market share" by platform token volume. This is calculated by aggregating the sum of prompt (input) and completion (output) tokens processed through its platform, with data compiled in daily UTC buckets [1][2][3]. Prediction markets focused on "Anthropic market share" typically resolve based on data obtained from OpenRouter's "Market Share" view, which provides a weekly calculation of share attributed to specific model authors or companies [3][4][5].
The metric reflects activity exclusively within OpenRouter's ecosystem. This measure indicates relative developer engagement solely on the OpenRouter platform, rather than representing the global artificial intelligence market [1][6][7][2]. It explicitly excludes private usage and traffic occurring outside OpenRouter, such as direct usage of model providers' own application programming interfaces. Furthermore, the metric is influenced by factors like model availability, pricing strategies, and platform-specific routing patterns [1][6][7][2].
Prediction markets specify evaluation criteria for specific weeks. These markets typically define a required threshold and a designated week for the data to be assessed [3][4][5]. It has been noted that a comprehensive public data set regarding AI market share does not currently exist, with the expectation that more robust, real-world data might become available once major industry players like OpenAI and Anthropic go public [8].
Sources (8)
  1. 1What an OpenRouter Usage Chart Can and Cannot Show Youdigitalapplied.com
  2. 2How to Read OpenRouter Model Usage Rankings for Business AI...technine.io
  3. 3OpenRouter's Real AI Rankings: DeepSeek Dominates, Chinese...pro.stockalarm.io
  4. 4Anthropic market share this week Odds & Predictions 2026 - Kalshikalshi.com
  5. 5Anthropic market share this week - Probabilidades na Kalshi | CoinRithmcoinrithm.com
  6. 6State of AI:An Empirical 100 Trillion Token Study with OpenRouterarxiv.org
  7. 7State of AI 2025: 100T Token LLM Usage Study | OpenRouteropenrouter.ai
  8. 8AI’s Achilles’ Heel: Why Everything Hinges on Anthropic & OpenAI | The Weekly Wrapyoutube.com

10. Have any major enterprise partnerships announced by Anthropic in Summer 2026 been substantial enough to drive a noticeable increase in its API volume?

Services Track and Partner Hub$100 million [1]
Kalshi Market Share TargetExceeds 2.75% [2]
Compute Capacity DealSpaceX (May 2026) [3]
Anthropic significantly expanded its enterprise partnerships during Summer 2026, initiating several key collaborations and programs. These included a partnership with IBM to integrate Claude into its software offerings [4], the launch of a $100 million Services Track and Partner Hub [1], and the formation of an enterprise AI services firm alongside Blackstone, Hellman & Friedman, and Goldman Sachs [5]. Additionally, Anthropic and Thomson Reuters broadened their existing collaboration [6]. These strategic enterprise developments, along with a May 2026 compute capacity deal with SpaceX, aimed to increase API usage limits [3].
Data is currently insufficient to confirm a surge in API volume from these Summer 2026 initiatives. Public information does not explicitly link these partnerships to a quantifiable increase in Anthropic's total API volume [4][1][5][6][3]. Therefore, there is insufficient data to definitively determine if these agreements have substantially driven a noticeable increase in API volume. The Kalshi prediction market provides an external measure, tracking whether Anthropic's OpenRouter text market share exceeds 2.75% for the week of September 8, 2026 [2].
Sources (6)
  1. 1Anthropic is launching a Services Track and Partner Hub to push...facebook.com
  2. 2Anthropic market share this week Odds & Predictions 2026 - Kalshikalshi.com
  3. 3Higher usage limits for Claude and a compute deal with SpaceXanthropic.com
  4. 4IBM taps Anthropic's Claude to accelerate enterprise AI developmentedtechinnovationhub.com
  5. 5Anthropic and partners establish enterprise AI services firmfinance.yahoo.com
  6. 6Thomson Reuters and Anthropic Expand Partnership to...thomsonreuters.com

11. What Could Change the Odds

Key Catalysts

Anthropic's IPO is scheduled for mid-October 2026, following a delay [1]. As of September 4, 2026, the company's annual recurring revenue (ARR) was approximately $65 billion, surpassing OpenAI's $40 billion, with a private valuation of $965 billion [2]. Anthropic also secured over $275 billion in compute capacity commitments to support its operations [3].
Market performance shows segmentation. Prediction markets track Anthropic's OpenRouter text market share, with a 2.75% threshold for positive resolution as of the week of September 8, 2026 [4]. Anthropic leads the enterprise LLM API market, commanding 40% of enterprise LLM API spend as of late 2025 and mid-2026 [5][6], and 32% usage share in April 2026, surpassing OpenAI (25%) and Google (20%) [7][8]. Its revenue mix is estimated at approximately 80% enterprise/API and 20% consumer (Claude.ai) [7][8]. In contrast, Claude captured approximately 9.6% to 10.3% of the generative AI chatbot market in September 2026 [9][10], and holds approximately 7% primary user share in the consumer AI assistant market as of mid-2026 [11]. The company faces competitive pressure from cheaper, leaner AI models [12] and is involved in a quota-reset conflict with OpenAI regarding subscription usage limits [13]. Additionally, Anthropic is in talks to buy an AI startup called DART for six billion, whose software lowers costs [14].

Key Dates & Catalysts

  • Expiration: September 14, 2026
  • Closes: September 14, 2026
Sources (14)
  1. 1Anthropic IPO launch shifts toward mid-October, sources say - Reutersreuters.com
  2. 2Anthropic surpasses OpenAI in ARR and valuation, says OpenAI presidentcryptobriefing.com
  3. 3Anthropic's AI compute deals top $275 billion in 2026 | Value Add Pulsevalueaddvc.com
  4. 4Anthropic market share this week Odds & Predictions 2026 - Kalshikalshi.com
  5. 5Anthropic Now Takes 40% of Enterprise LLM Spend - Value Add VCvalueaddvc.com
  6. 6LLM Statistics 2026: Market Size, Market Share, and Why the Two Leaders Are Different Companies - Axis Intelligenceaxis-intelligence.com
  7. 7The Inference Bottleneck: A Formal Model of Vertical Foreclosure in AI Marketsarxiv.org
  8. 8https://arxiv.org/pdf/2604.17431arxiv.org
  9. 9Top Generative AI Chatbots by Market Share – September 2026 – First Page Sagefirstpagesage.com
  10. 10AI and LLM Market Share 2026: Users, Trends, Regionsdiploria.ai
  11. 11Platform Choice, Trust, and Privacy in the Consumer AI Assistant Marketarxiv.org
  12. 12Anthropic AI Models Losing Market Share to Cheaper Rivalsai-newspaper.com
  13. 13Claude Code's 17% Limit Cut & the GPT-6 Astra Reset Warorcarouter.ai
  14. 14Anthropic's $2T IPO, Zuck's AI Manifesto, Nvidia's $500B AI Bet, Grok's Comebackyoutube.com

13. Related News

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Last updated: September 9, 2026, 13:12 UTC

Cheaper AI Rivals Drive Down Forecasts for Anthropic's Market Share

A growing body of analysis showing intense competition from lower-cost AI models has prompted traders to sharply reduce expectations for Anthropic's market share on the OpenRouter API platform. In the...

14. Historical Resolutions

Historical Resolutions: 20 markets in this series

Outcomes: 6 resolved YES, 14 resolved NO

Recent resolutions:

  • KXANTHSHARE-26SEP07-3.8: NO (Sep 07, 2026)
  • KXANTHSHARE-26SEP07-3.4: NO (Sep 07, 2026)
  • KXANTHSHARE-26SEP07-3.2: NO (Sep 07, 2026)
  • KXANTHSHARE-26SEP07-3.0: NO (Sep 07, 2026)
  • KXANTHSHARE-26SEP07-2.8: YES (Sep 07, 2026)