Anthropic market share this week
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.
Who Wins and Why
| Outcome | Market | Model | Why |
|---|---|---|---|
| Above 3.45% | 1.0% | 1.1% | Anthropic's Q3 2026 market share shows a downward trend due to competitive pricing and cheaper models. |
| Above 3.25% | 5.0% | 3.2% | Anthropic's Q3 2026 market share shows a downward trend due to competitive pricing and cheaper models. |
| Above 2.95% | 10.0% | 13.4% | Anthropic's Q3 2026 market share shows a downward trend due to competitive pricing and cheaper models. |
| Above 3.1% | 9.0% | 6.8% | Anthropic's Q3 2026 market share shows a downward trend due to competitive pricing and cheaper models. |
| Above 2.85% | 19.0% | 20.4% | Anthropic's Q3 2026 market share shows a downward trend due to competitive pricing and cheaper models. |
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% [^][^]. 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 [^][^][^]. 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 [^][^]. 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 [^][^][^]. In early 2026, Anthropic’s usage share was 32%, ahead of OpenAI's 25% and Google's 20% [^][^][^].
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 [^][^][^]. Anthropic's Claude accounted for approximately 9.3%–10.3% of this traffic [^][^][^]. 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% [^]. 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 [^].
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 [^]. 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 [^]. Hyperscalers exhibit significant dependency on both Anthropic and OpenAI [^]. The march to anticipated initial public offerings continues for both companies [^], with Salesforce deepening its partnership with Anthropic PBC [^].
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 [^]. 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 [^][^][^]. While Anthropic holds a significant share in enterprise LLM spend (approximately 40%) and has shown growth in its API market share [^][^][^][^][^][^], 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.
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.
Available Contracts
Market options and current pricing
| Outcome bucket | Yes (price) | No (price) | Last trade probability |
|---|---|---|---|
| Above 2.25% | $0.95 | $0.09 | 95% |
| Above 2.45% | $0.65 | $0.48 | 79% |
| Above 2.6% | $0.54 | $0.56 | 52% |
| Above 2.75% | $0.30 | $0.71 | 30% |
| Above 2.85% | $0.31 | $0.87 | 19% |
| Above 2.95% | $0.12 | $0.90 | 10% |
| Above 3.1% | $0.13 | $0.91 | 9% |
| Above 3.25% | $0.07 | $0.94 | 5% |
| Above 3.45% | $0.02 | $1.00 | 1% |
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 [^][^][^][^][^][^]. 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 [^][^][^][^][^]. Furthermore, in the consumer AI assistant market, Claude held approximately 7% of primary platform usage in mid-2026, significantly trailing competitors [^].
5. Trader Dashboard
A deterministic, per-market integrity scorecard computed from order-book and price data. Higher is better for Trader Trust, Liquidity, Move Quality and Resolution; higher means more risk for Quote Risk and Avoid Risk.
Above 3.45%PrimaryTrader Trust—Liquidity—Move Quality84Resolution—Quote Risk—Avoid Risk—
Move Quality84Confirmed
- Factor
- Factor
- flow_agreement
- 0.85
- move_retained_pct
- 100
Above 2.25%Trader Trust—Liquidity—Move Quality74Resolution—Quote Risk—Avoid Risk—
Move Quality74Confirmed
- Factor
- Factor
- flow_agreement
- 0.85
- move_retained_pct
- 100
Above 2.6%Trader Trust—Liquidity—Move Quality75Resolution—Quote Risk—Avoid Risk—
Move Quality75Confirmed
- Factor
- Factor
- flow_agreement
- 0.85
- move_retained_pct
- 99
Above 2.75%Trader Trust—Liquidity—Move Quality52Resolution—Quote Risk—Avoid Risk—
Move Quality52Mixed
- Factor
- Factor
- flow_agreement
- 0.85
- move_retained_pct
- 41
Above 2.85%Trader Trust—Liquidity—Move Quality59Resolution—Quote Risk—Avoid Risk—
Move Quality59Mostly confirmed
- Factor
- Factor
- flow_agreement
- 0.85
- move_retained_pct
- 50
Above 2.95%Trader Trust—Liquidity—Move Quality—Resolution—Quote Risk—Avoid Risk—
Move Quality—No significant move (6h)
- Factor
- move_log_odds
- -0.11
Above 3.1%Trader Trust—Liquidity—Move Quality83Resolution—Quote Risk—Avoid Risk—
Move Quality83Confirmed
- Factor
- Factor
- flow_agreement
- 0.85
- move_retained_pct
- 100
Above 3.25%Trader Trust—Liquidity—Move Quality—Resolution—Quote Risk—Avoid Risk—
Move Quality—No significant move (23h)
- Factor
- move_log_odds
- -0.19
trader_dashboard_lean_v1.14 · computed Sep 9, 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) [^][^][^][^] |
|---|---|
| Claude Fable 5 Output Token Cost | $50 per million output tokens (Q3 2026) [^][^][^][^] |
| Preferred for Complex Coding | Claude Fable 5 [^][^][^][^] |
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 [^][^][^][^]. 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 [^][^][^].
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 [^][^]. Developers often prefer Fable 5 for complex, correctness-critical coding tasks, where it consistently demonstrates higher code quality in practical application benchmarks [^][^][^][^]. Consequently, Claude Fable 5 is frequently deployed as a specialized "safety net" or for high-stakes, long-horizon agentic workflows, leveraging its unique strengths [^][^].
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 growth | 82% [^][^] |
|---|---|
| Anthropic Q3 2026 API spend growth | 76% [^][^] |
| Anthropic OpenRouter market share (Sept 8, 2026 prediction) | 2.75%-3.5% [^][^] |
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 [^][^]. 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% [^][^]. OpenRouter, acquired by Stripe for $7.5 billion in August 2026, is characterized by intense pricing competition [^][^].
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 [^][^]. 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.
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 Share | 14.8% (June 2026) [^][^] |
|---|---|
| Prediction Market Share Thresholds | 3.0% to 5.5% (August-September 2026) [^][^][^][^] |
| Chinese-Origin Models' OpenRouter Share | Over 45% (by April 2026) [^][^][^] |
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 [^][^]. 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 [^][^][^][^]. These market share metrics from OpenRouter are derived from real-time API token usage across its platform, encompassing both prompt and completion tokens [^][^][^]. This comprehensive measurement serves as a reliable proxy for broader developer and application usage.
9. How is 'text market share' defined and measured by OpenRouter, the likely source for this market's resolution?
| OpenRouter 'text market share' definition | Calculated by volume of prompt and completion tokens, aggregated daily in UTC buckets [^][^][^] |
|---|---|
| Prediction market resolution basis | Based on OpenRouter's 'Market Share' view, calculated weekly by model author or company [^][^][^] |
| Scope of OpenRouter metric | Reflects developer activity solely within OpenRouter's ecosystem, not the global AI market [^][^][^][^] |
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 [^][^][^]. 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 [^][^][^].
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 [^][^][^][^]. 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 [^][^][^][^].
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 [^][^][^]. 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 [^].
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 [^] |
|---|---|
| Kalshi Market Share Target | Exceeds 2.75% [^] |
| Compute Capacity Deal | SpaceX (May 2026) [^] |
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 [^], the launch of a $100 million Services Track and Partner Hub [^], and the formation of an enterprise AI services firm alongside Blackstone, Hellman & Friedman, and Goldman Sachs [^]. Additionally, Anthropic and Thomson Reuters broadened their existing collaboration [^]. These strategic enterprise developments, along with a May 2026 compute capacity deal with SpaceX, aimed to increase API usage limits [^].
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 [^][^][^][^][^]. 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 [^].
11. What Could Change the Odds
Key Catalysts
Anthropic's IPO is scheduled for mid-October 2026, following a delay [^] . 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 [^]. Anthropic also secured over $275 billion in compute capacity commitments to support its operations [^].
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 [^]. Anthropic leads the enterprise LLM API market, commanding 40% of enterprise LLM API spend as of late 2025 and mid-2026 [^][^], and 32% usage share in April 2026, surpassing OpenAI (25%) and Google (20%) [^][^]. Its revenue mix is estimated at approximately 80% enterprise/API and 20% consumer (Claude.ai) [^][^]. In contrast, Claude captured approximately 9.6% to 10.3% of the generative AI chatbot market in September 2026 [^][^], and holds approximately 7% primary user share in the consumer AI assistant market as of mid-2026 [^]. The company faces competitive pressure from cheaper, leaner AI models [^] and is involved in a quota-reset conflict with OpenAI regarding subscription usage limits [^]. Additionally, Anthropic is in talks to buy an AI startup called DART for six billion, whose software lowers costs [^].
Key Dates & Catalysts
- Expiration: September 14, 2026
- Closes: September 14, 2026
12. Decision-Flipping Events
- Trigger: Anthropic's IPO is scheduled for mid-October 2026, following a delay [^] .
- Trigger: 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 [^] .
- Trigger: Anthropic also secured over $275 billion in compute capacity commitments to support its operations [^] .
- Trigger: Market performance shows segmentation.
14. Related News
15. 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)
