Short Answer

The model assigns meaningfully lower odds than the market for Mythos releasing "Before Jan 1, 2027" (16.6% model vs 28.0% market). This divergence is driven by the unrestricted Claude Mythos 5 model remaining confined to vetted partners, with no specific date announced for broader public release.

1. Market Behavior & Drivers

This prediction market's price chart illustrates a sharp, news-driven collapse. The overall trend was downward, beginning at a 25.0% probability and ultimately settling at 1.0%. The most critical price action occurred around a key announcement date. On June 7, the price experienced a 10.0 percentage point spike, which appeared to be driven by intense social media speculation and reports that Anthropic was expected to release Mythos publicly on June 9. This speculative rally continued until June 9, when the market price crashed by 60.0 percentage points, from 61.0% to 1.0%. This precipitous drop was a direct response to Anthropic's official announcement that the unrestricted Mythos 5 model would not be publicly released, but limited to vetted partners.
The total traded volume of 370,608 contracts indicates significant market participation, with trading activity concentrated around the speculative run-up and subsequent crash, suggesting high conviction behind the major price movements. The chart established an early baseline around the 25.0% to 28.0% range before speculation drove the price to a peak of 61.0%, which became a firm resistance level that was immediately rejected. The current price of 1.0% acts as a support floor, indicating the market has reached a near-certain conclusion. Market sentiment began with moderate optimism, shifted to strong bullishness based on rumors, and then reversed completely to become overwhelmingly bearish following the official news. The final price reflects the market's interpretation that the release of a restricted Mythos and a public Fable 5 did not satisfy the resolution criteria for a public release of "Mythos".
  • The unrestricted Claude Mythos 5 model remains partner-confined.
  • No specific public release date announced for unrestricted Mythos 5.
  • Broader release is contingent on future safeguard development.
  • Anthropic released public-facing Claude Fable 5 on June 9, 2026.
  • Competitive pressures likely accelerated Mythos-class model release timeline.

Who Wins and Why

Outcome Market Model Why
Before Oct 1, 2026 19.0% 11.1% Public release is contingent on safeguard development; no specific date is announced.
Before Nov 1, 2026 18.0% 11.1% Public release is contingent on safeguard development; no specific date is announced.
Before Dec 1, 2026 22.0% 12.9% Public release is contingent on safeguard development; no specific date is announced.
Before Jan 1, 2027 28.0% 16.6% Public release is contingent on safeguard development; no specific date is announced.

Current Context

Anthropic launched Mythos 5 and Fable 5 on June 9, 2026. The latest iteration of its frontier model, Claude Mythos 5, was released simultaneously with Claude Fable 5, a safety-guardrailed public version of the same architecture [1][2][3][4]. Access to the unrestricted Claude Mythos 5 model remains limited to vetted partners under Project Glasswing for cybersecurity and will soon include select biology researchers [1][2][3][5]. This restricted access is due to significant risks associated with its uncapped capabilities [1][2][3][5].
Severe risks prevented general release of Claude Mythos Preview previously. Anthropic originally announced 'Claude Mythos Preview' on April 7, 2026, but explicitly stated it would not be generally released due to severe cybersecurity risks [6][7][8]. These risks specifically involved the model's capacity for autonomous identification and exploitation of zero-day vulnerabilities [6][7][8]. Anthropic has not provided a specific date for a broader public release of the unrestricted Mythos model, aiming instead to expand access through trusted programs as they continue to evaluate safety and demand [9][10].
Sources (10)
  1. 1Claude Fable 5 and Claude Mythos 5 \ Anthropicanthropic.com
  2. 2Claude Mythos \ Anthropicanthropic.com
  3. 3Anthropic releases guardrailed version of Mythos for public use | Semaforsemafor.com
  4. 4Anthropic Releases Watered-Down Version Of Mythos, An AI Model Many Fear Was Too Powerful | IFLScienceiflscience.com
  5. 5Anthropic unveils claude Fable 5, bringing its powerful Mythos AI to the publicgadgetsnow.indiatimes.com
  6. 6Project Glasswing: Securing critical software for the AI era - Anthropicanthropic.com
  7. 7Claude Mythos: What Does Anthropic's New Model Mean for the...cetas.turing.ac.uk
  8. 8Our evaluation of Claude Mythos Preview's cyber capabilitiesaisi.gov.uk
  9. 9Anthropic releases version of AI tool despite risk concerns - BBCbbc.com
  10. 10Anthropic says Claude now writes over 90% of its code and wants the world to have an AI pause buttonthe-decoder.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: Before Aug 1, 2026

📉 June 09, 2026: 82.0pp drop

Price decreased from 92.0% to 10.0%

What happened: The primary driver of the prediction market price movement was Anthropic's official announcement on June 9, 2026 [1]. Anthropic announced the release of Claude Mythos 5, specifying it would remain restricted to specific partners due to high-risk capabilities, while launching Claude Fable 5, a safeguarded "Mythos-class" model, for general public use [1]. This indicated that a public release of Mythos would not occur before the August 1, 2026 deadline, leading to the substantial drop in the prediction market for that outcome. Social media activity was not indicated as a primary driver, contributing accelerant, or significant noise, as the market movement was directly attributable to official company announcements and subsequent news coverage.

Outcome: Before Jun 15, 2026

📈 June 07, 2026: 10.0pp spike

Price increased from 18.0% to 28.0%

What happened: The primary driver of the June 7, 2026, price spike was intense social media speculation on X, amplified by reports from journalists and analysts [2]. These reports indicated that Anthropic was expected to release Mythos AI publicly on June 9, 2026 [2][3]. This activity appeared to lead the market movement, anticipating Anthropic's release of the public-facing, guardrailed Claude Fable 5 model (a Mythos-class model) on June 9, 2026 [4][5]. Social media was a primary driver.

Outcome: Before Jul 1, 2026

📈 June 06, 2026: 18.0pp spike

Price increased from 42.0% to 60.0%

What happened: The prediction market price spike on June 6, 2026, was primarily driven by market anticipation of Anthropic's imminent release of the Mythos model. While specific social media activity or breaking news from June 6, 2026, is not detailed in the provided sources, the movement preceded Anthropic's official announcement on June 9, 2026, confirming the release of Claude Fable 5 and the restricted Claude Mythos 5 [1][6][7]. This official release, occurring before July 1, 2026, validated the market's pre-emptive movement [1][6][7]. Based on the provided information, social media cannot be identified as a primary driver or contributing accelerant, as no relevant social activity from the date of the price spike is referenced.

📈 June 04, 2026: 11.0pp spike

Price increased from 27.0% to 38.0%

What happened: The 11.0 percentage point spike on June 4, 2026, for the "Before Jul 1, 2026" outcome was most likely driven by anticipation or pre-announcement leaks regarding Anthropic's public release of 'Claude Fable 5' on June 9, 2026 [1][5][8]. 'Claude Fable 5' is based on the "Mythos-class" architecture, leading market participants to interpret its release as a form of "Mythos" availability, even though the full, unrestricted 'Claude Mythos 5' remains restricted [1][5][9]. No specific social media activity from key figures or viral narratives are evident in the provided information to directly explain the timing of this price movement. Social media was mostly noise or irrelevant in this specific instance, based on the provided data.

Outcome: Before Sep 1, 2026

📈 June 02, 2026: 9.0pp spike

Price increased from 78.0% to 87.0%

What happened: The provided web research details Anthropic's release of Claude Fable 5 and Claude Mythos 5 on June 9, 2026 [1][10]. This release date is seven days after the observed 9.0 percentage point price spike in the "Before Sep 1, 2026" outcome, which occurred on June 02, 2026. The available information does not specify any social media activity, traditional news, or market structure factors that directly caused the price movement on June 02, 2026. Therefore, based solely on the provided data, the primary driver for the market spike cannot be identified. Social media activity cannot be assessed as a primary driver or contributing factor given the absence of information for the relevant date.
Sources (10)
  1. 1Claude Fable 5 and Claude Mythos 5 \ Anthropicanthropic.com
  2. 2Claude Mythos 2 Rumor: A Day on X - AIScrollaiscroll.io
  3. 3Anthropic to release Mythos AI publicly on June 9: Reportsthenews.com.pk
  4. 4Anthropic releases guardrailed version of Mythos for public use | Semaforsemafor.com
  5. 5Anthropic releases Mythos-like AI model to the public, Claude Fable 5cnbc.com
  6. 6Introducing Claude Fable 5 and Claude Mythos 5 - Claude API Docsplatform.claude.com
  7. 7Claude Fable 5 and Claude Mythos 5 \ Anthropicanthropic.com
  8. 8Anthropic releases version of AI tool despite risk concerns - BBCbbc.com
  9. 9Claude Mythos \ Anthropicanthropic.com
  10. 10Anthropic rolls out public version of Mythos without cybersecurity capability | The Starthestar.com.my

4. Market Data

Contract Snapshot

The market resolves to "Yes" if Anthropic releases a model explicitly named "Mythos" (e.g., "Claude Mythos 5") to the general public by the specified deadline for each sub-market. A public release includes paid subscription tiers but excludes closed betas; crucially, a model described as "Mythos-class" with a different name (e.g., "Claude Fable 5") does not count. If these conditions are not met by the respective deadline (e.g., before January 1, 2027, for which the market closes on December 31, 2026, 11:59 PM EST), the market resolves to "No."

Available Contracts

Market options and current pricing

Outcome bucket Yes (price) No (price) Last trade probability
Before Oct 1, 2026 $0.19 $0.82 19%
Before Nov 1, 2026 $0.19 $0.82 18%
Before Dec 1, 2026 $0.22 $0.79 22%
Before Jan 1, 2027 $0.28 $0.73 28%

Market Discussion

The market discussion revolves around the strict payout criteria, which require Anthropic to release a model named "Mythos" to the public. Arguments for "Yes" contend that recent releases like "Fable 5" are effectively "Mythos-class" and that the naming distinction is overly semantic, with some traders accusing the market of arbitrary rule enforcement to avoid payouts. Conversely, the market's official position and other traders uphold the "fine print," noting that "Fable 5" is not named "Mythos" and any "Mythos 5" release was not public, leading to declining "Yes" probabilities as the event has not yet occurred.

5. Trust Index

Octagon Trust Index Kalshi 69 Caution

Primary risk· Trade quality

How it adds up
Integrity80% of score83Good
Trade quality20% of score15Avoid
Trust score69Caution

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
79Good

Outcome is hard to influence

Large tradesTrade signals · medium confidence

Largest single print on KXCLAUDE-MYTH-27JAN01 carried 37% of its $1,265 tape (window is 100% of 24h flow; print is 8d old)

Screened clean
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
11Very thin

Hard to fill near the screen price

4 contracts · worst first · 2 settled or closed — not scored

Before Jan 1, 20275
Very thin · low confidence

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

Before Oct 1, 20265
Very thin · low confidence

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

Before Dec 1, 202624
Very thin · low confidence

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

Before Nov 1, 202630
Very thin · low confidence

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

Move quality
71Confirmed

Moves came with real volume

4 contracts · worst first · 2 settled or closed — not scored

Before Dec 1, 202671
Confirmed · medium confidence

Volume opposes the move over 24h

Before Oct 1, 202690
Confirmed · high confidence

Volume confirms the move over 6h

Before Jan 1, 2027—
No significant move (6h)

Price was stable over the last 6 hours.

Before Nov 1, 2026—
No significant move (24h)

Price was stable over the last 24 hours.

Rule clarity
100Clear

Counts toward Resolution quality, not here

4 contracts · worst first · 2 settled or closed — not scored

Before Jan 1, 2027100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Before Dec 1, 2026100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Before Oct 1, 2026100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Before Nov 1, 2026100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Trade quality
15Avoid

Thin market — entering or exiting at fair value will be difficult.

Outcome quality 15 (notional-weighted across 4 scored legs)

2 settled or closed — not scored

Before Jan 1, 20275Market 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
Before Dec 1, 202624Market scoreLiquidity24Move quality71Rule clarity100
Why 24
Liquidity
24 · Very thin · low confidence

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

Move quality
71 · Confirmed · medium confidence

Volume opposes the move over 24h

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Before Oct 1, 20265Market scoreLiquidity5Move quality90Rule clarity100
Why 5
Liquidity
5 · Very thin · low confidence

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

Move quality
90 · 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
Before Nov 1, 202630Market scoreLiquidity30Move quality–Rule clarity100
Why 30
Liquidity
30 · Very thin · low confidence

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

Move quality
No significant move (24h)

Price was stable over the last 24 hours.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear

underwriting_v1.4 · computed Sep 23, 2026

6. What competitive pressures from OpenAI or Google could accelerate Anthropic's timeline for a public Mythos release before 2027?

Funding Round$65 billion [1][2][3][4][5]
Company Valuation$965 billion [1][2][3][4][5]
Claude Fable 5 Public ReleaseJune 9, 2026 [1][2][6][7]
Anthropic significantly accelerated its Mythos-class model release due to market pressures. Intense competitive pressures from companies like OpenAI and Google, combined with substantial commercial incentives from a $65 billion funding round and a $965 billion valuation, hastened the commercialization of Anthropic's Mythos-class capabilities [1][2][3][4][5]. This accelerated development led to Anthropic publicly releasing a version of its Mythos-class model, branded as Claude Fable 5, on June 9, 2026 [1][2][6][7]. Prediction markets regarding the "Mythos" release largely resolved following this announcement, with participants having previously cited intense competition as a primary factor for an earlier release timeline [8][9][10][11][12].
A dual-release strategy balanced commercial drivers with safety concerns. Anthropic implemented this approach to manage the competitive environment alongside critical safety considerations [1][2][3][4][5]. Under this strategy, the safeguarded Claude Fable 5 became publicly available. In contrast, the full-capability Mythos 5 model remains restricted to partners within the Project Glasswing cybersecurity consortium [1][2][6][7].
Sources (12)
  1. 1Anthropic Launches 'Mythos Class' AI Models, Pressuring OpenAI and Google | AJU PRESSm.ajupress.com
  2. 2Anthropic Releases Watered-Down Version Of Mythos, An AI Model Many Fear Was Too Powerful | IFLScienceiflscience.com
  3. 3Mythos vs. GPT‑5.4‑Cyber - by Fabian Hediger - StudioAlphastudioalpha.substack.com
  4. 4Anthropic Mythos: The Frontier Model Anthropic Withheldcodersera.com
  5. 5Anthropics Mythos AI Can Autonomously Hack — And Its Almost Herewitho2.com
  6. 6Claude Fable: 10,000 Zero-Days Found by Anthropic's New AI - FourWeekMBAfourweekmba.com
  7. 7Claude Mythos \ Anthropicanthropic.com
  8. 8When will Anthropic release Mythos? Odds & Predictions - Kalshikalshi.com
  9. 9When will Anthropic release Mythos? | Prediction Markets | Coinbasecoinbase.com
  10. 10Claude Mythos released by…? Trading Odds & Predictions 2026 | Polymarketpolymarket.com
  11. 11Claude Mythos released on…? Trading Odds & Predictions 2026 | Polymarketpolymarket.com
  12. 12Will Anthropic make Claude Mythos broadly available before July 1, 2026? | Manifoldmanifold.markets

7. What specific safety thresholds, as defined by Anthropic's Responsible Scaling Policy, are currently preventing a general release of Claude Mythos 5?

Claude Mythos 5 Release StatusSpecialized model tier, restricted to approved, vetted partners [1][2]
Reason for RestrictionLacks safety classifiers present in Claude Fable 5 [1][2]
Claude Fable 5 Launch DateJune 9, 2026 [1][2]
Claude Mythos 5 is a specialized model restricted to specific partners. This model is not being withheld from a general release due to specific Responsible Scaling Policy (RSP) thresholds. Instead, Anthropic has limited Claude Mythos 5 to approved partners, such as Project Glasswing partners and select biology researchers, primarily because it does not include the safety classifiers present in the widely released Claude Fable 5, which became available on June 9, 2026 [1][2].
Anthropic's Responsible Scaling Policy guides releases, not specific model blocks. The RSP employs capability-based AI Safety Levels (ASL) and various thresholds, including ASL-3, ASL-4, and those related to Autonomous AI R&D or CBRN weapons, to enforce specific security and deployment safeguards [3][4][5]. This policy guides the company's decisions on model releases rather than serving as a direct block for a particular model name like 'Mythos' [3][4][5]. As of June 10, 2026, Claude Mythos 5's availability remains limited to Glasswing partners, signifying it is not generally accessible and continues to be a topic for prediction markets regarding its broader release [6][7][8].
Sources (8)
  1. 1Claude Fable 5 and Claude Mythos 5 \ Anthropicanthropic.com
  2. 2Introducing Claude Fable 5 and Claude Mythos 5 - Claude API Docsplatform.claude.com
  3. 3Anthropic’s Responsible Scaling Policy (version 3.0)www-cdn.anthropic.com
  4. 4Responsible Scaling Policy Version 3.0 \ Anthropicanthropic.com
  5. 5Anthropic’s Responsible Scaling Policy (version 2.2) - Google Docswww-cdn.anthropic.com
  6. 6When will Anthropic release Mythos? | Prediction Markets | Coinbasecoinbase.com
  7. 7Claude Mythos released by June 30? | Myriadmyriad.markets
  8. 8Will Anthropic make Claude Mythos broadly available before July 1, 2026? | Manifoldmanifold.markets

8. How do the capabilities of the publicly available Claude Fable 5 differ from the partner-restricted Claude Mythos 5?

Release DateJune 9, 2026 (for Fable 5) [1][2]
Fable 5 AvailabilityGenerally available via Claude API, Amazon Bedrock, Google Cloud Vertex AI, and Microsoft Foundry [1][2]
Mythos 5 AccessRestricted to vetted partners through Project Glasswing, with safeguards lifted [3][4][2]
Claude Fable 5 and Mythos 5 share core architecture and base capabilities. Both models represent Anthropic's most advanced 'Mythos-class' offerings, sharing the same underlying architecture and base capability level, and were released on June 9, 2026 [5][4][2]. The primary distinction between these two models lies in their respective safety measures and accessibility [3][4][2].
Claude Fable 5 is generally available with robust safety measures. Released on June 9, 2026, it is widely accessible through multiple platforms, including the Claude API, Amazon Bedrock, Google Cloud Vertex AI, and Microsoft Foundry [1][2]. This model is equipped with robust safety classifiers specifically designed to automatically redirect high-risk queries, particularly those concerning cybersecurity and biology, to the Opus 4.8 model [3][4][2].
Claude Mythos 5 has lifted safeguards and restricted partner access. While it offers a different operational profile due to the removal of these specific safeguards, its accessibility is significantly more restricted [3][4][2]. Claude Mythos 5 is exclusively available to vetted partners through a dedicated initiative known as Project Glasswing [3][4][2].
Sources (5)
  1. 1AWS announces Claude Fable 5, the first generally available Mythos-class model - AWSaws.amazon.com
  2. 2Introducing Claude Fable 5 and Claude Mythos 5 - Claude API Docsplatform.claude.com
  3. 3Claude Mythos - Anthropicanthropic.com
  4. 4Claude Fable 5 vs Mythos 5: Review and Benchmark Analysislabellerr.com
  5. 5Claude Fable 5 and Claude Mythos 5 \ Anthropicanthropic.com

9. What is the publicly communicated roadmap for Project Glasswing, and what partner feedback would signal a move towards a broader release?

Project NameProject Glasswing (Anthropic initiative) [1]
Model UsedClaude Mythos Preview [1][2][3]
Current Access StatusRestricted to authorized partners [1][4][3][5][6]
Project Glasswing is an Anthropic initiative focused on securing critical software. It utilizes a restricted-access frontier model called "Claude Mythos Preview," specifically designed for cybersecurity tasks like vulnerability scanning [1][2][3]. Currently, access to Mythos-class models is limited to authorized partners because Anthropic has not yet developed sufficient safeguards to prevent potential misuse [1][4][3][5][6].
The publicly communicated roadmap for Project Glasswing involves expanding the initiative to additional partners. These partners include infrastructure providers, open-source maintainers, and safety testers, while maintaining strict security requirements [4][7][8]. A general release of Mythos-class models is planned for the future, contingent upon the development and implementation of these necessary safeguards [1][4][3][5]. Prediction markets have shown activity regarding the public release of Mythos, with some indicating high probability or resolution by June 9, 2026 [9][10][11][6].
A broader Mythos release hinges on sufficient safeguards, not explicit partner feedback. The research does not explicitly detail what specific partner feedback would trigger a move towards a broader release of Mythos-class models. However, Anthropic has consistently stated that a general public release is anticipated once sufficient safeguards are in place [1][4][3][5].
Sources (11)
  1. 1Project Glasswing: An initial update \ Anthropicanthropic.com
  2. 2Project Glasswing \ Anthropicanthropic.com
  3. 3Project Glasswing: An initial update \ Anthropicanthropic.com
  4. 4Expanding Project Glasswing \ Anthropicanthropic.com
  5. 5Project Glasswing: An initial update \ Anthropicanthropic.com
  6. 6Claude Mythos released by June 30? | Myriadmyriad.markets
  7. 7Expanding Project Glasswing \ Anthropicanthropic.com
  8. 8Project Glasswing 2026: Anthropic Expands AI Cyber Defence to 150 Partners - Business 2.0 Newsbusiness20channel.tv
  9. 9When will Anthropic release Mythos? Odds & Predictions - Kalshikalshi.com
  10. 10Claude Mythos released by…? Trading Odds & Predictions 2026 | Polymarketpolymarket.com
  11. 11Claude Mythos released on…? Trading Odds & Predictions 2026 | Polymarketpolymarket.com

10. How might emerging AI regulations in the US and UK concerning dual-use models affect Anthropic's public release strategy in late 2026?

Anthropic Mythos 5 ReleaseJune 9, 2026 [1]
US AI Regulation FrameworkVoluntary 30-day pre-release evaluation [2][3][4]
UK AI Regulation ApproachVoluntary, standards-based [5]
Emerging US and UK AI regulations are voluntary, not mandatory, for Anthropic. Anthropic publicly released its "Mythos 5" frontier model on June 9, 2026 [1]. Concurrently, new AI regulations in the US and UK, established around June 2026, involve voluntary frameworks, meaning they do not impose mandatory changes on Anthropic's public release strategy for any subsequent models or updates in late 2026 [2][3][4][5].
US and UK frameworks offer voluntary pre-release evaluations for frontier models. A US Executive Order signed on June 2, 2026, established a voluntary framework for AI developers to provide the federal government with a pre-release evaluation window of up to 30 days for "covered frontier models." This order explicitly avoids mandatory licensing or preclearance requirements [2][3][4]. Additionally, the UK AI Safety Institute maintains a voluntary, standards-based approach to frontier AI, with an ongoing trend toward formalizing bilateral US-UK cooperation on AI security [5][6].
Insufficient information exists to predict Anthropic's strategic adjustments to voluntary frameworks. Given that these regulatory frameworks are voluntary, the available facts do not contain enough information to specify how Anthropic might alter its public release strategy for any new models or updates in late 2026. While Anthropic could choose to engage with these voluntary evaluation frameworks for future releases, the facts do not detail any specific strategic adjustments it might make based on these non-mandatory regulations [2][3][4][5].
Sources (6)
  1. 1Mythos Is Here. Anthropic Just Shipped the Model They Said Was Too Dangerous.mattpaige68.substack.com
  2. 2Trump Executive Order on AI: Voluntary Framework, Cybersecurity Focus, and Key Takeaways | Freshfieldsfreshfields.com
  3. 3Trump’s New AI EO: Voluntary Frameworks, Cyber Crackdowns, and What It Means for Developers and Tech Companies | ArentFox Schiffafslaw.com
  4. 4Trump AI executive order sets 30-day frontier model reviewtheregister.com
  5. 5Advancing U.S.–UK Cooperation to Secure Frontier Artificial Intelligence | RANDrand.org
  6. 6From rule-follower to architect: OpenAI's federal blueprint and what a single US AI regime means for the UK - Resultsenseresultsense.com

11. What Could Change the Odds

Key Catalysts

Anthropic officially released a public-facing version of its Mythos-class model, named Claude Fable 5, on June 9, 2026 [1][2][3]. Anthropic also released an updated version called Claude Mythos 5 on June 9, 2026; however, its access remains restricted to vetted partners for specialized use cases like cybersecurity and biological research [1][4][3].
Claude Fable 5 is a Mythos-class model that incorporates specific safety guardrails, enabling its general availability to enterprise customers and paid subscribers [1][3]. Claude Mythos 5 is the underlying model with safeguards lifted in certain areas, restricted to Project Glasswing participants and select research partners [1][3].
Prediction markets regarding the release of "Claude Mythos" saw high activity throughout the spring of 2026; these markets have effectively resolved or are resolving following the June 9, 2026 announcement [5][6][7][8][9].

Key Dates & Catalysts

  • Expiration: June 22, 2026
  • Closes: January 01, 2027
Sources (9)
  1. 1Claude Fable 5 and Claude Mythos 5 \ Anthropicanthropic.com
  2. 2Anthropic releases guardrailed version of Mythos for public use | Semaforsemafor.com
  3. 3Anthropic releases Mythos-like AI model to the public, Claude Fable 5cnbc.com
  4. 4Claude Mythos \ Anthropicanthropic.com
  5. 5Claude Mythos released by…? Trading Odds & Predictions 2026 | Polymarketpolymarket.com
  6. 6When will Anthropic release Mythos? | Prediction Markets | Coinbasecoinbase.com
  7. 7Will Anthropic make Claude Mythos broadly available before July 1, 2026? | Manifoldmanifold.markets
  8. 8Will a Claude Mythos model be released by Jun… 100% Yes · Polymarketexplorer.struct.to
  9. 9Claude Mythos released by June 30? | Myriadmyriad.markets

13. Related News

-82.0pp
Last updated: June 10, 2026, 13:11 UTC

Anthropic's Restricted AI Release Pushes Timeline Bets Sharply Lower

Probabilities for a 2026 public release of Anthropic’s powerful Mythos AI model plummeted on Tuesday, June 9, 2026, after the company’s official announcement of the model was interpreted by traders as...

14. Historical Resolutions

Historical Resolutions: 7 markets in this series

Outcomes: 5 resolved YES, 2 resolved NO

Recent resolutions:

  • KXCLAUDE-CLAU-26SEP01: YES (Jun 09, 2026)
  • KXCLAUDE-CLAU-26OCT01: YES (Jun 09, 2026)
  • KXCLAUDE-CLAU-26NOV01: YES (Jun 09, 2026)
  • KXCLAUDE-CLAU-26MAY01: NO (May 01, 2026)
  • KXCLAUDE-CLAU-26JUN01: NO (Jun 01, 2026)