When will Anthropic release Mythos?
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. Executive Verdict
- 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 Jun 15, 2026 | 1.0% | 0.6% | Public release is contingent on safeguard development; no specific date is announced. |
| Before Jul 1, 2026 | 3.0% | 1.7% | Public release is contingent on safeguard development; no specific date is announced. |
| Before Aug 1, 2026 | 7.0% | 4.0% | Public release is contingent on safeguard development; no specific date is announced. |
| Before Sep 1, 2026 | 18.0% | 10.5% | Public release is contingent on safeguard development; no specific date is announced. |
| Before Oct 1, 2026 | 19.0% | 11.1% | 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 [^][^][^][^]. 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 [^][^][^][^]. This restricted access is due to significant risks associated with its uncapped capabilities [^][^][^][^].
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 [^][^][^]. These risks specifically involved the model's capacity for autonomous identification and exploitation of zero-day vulnerabilities [^][^][^]. 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 [^][^].
2. Market Behavior & Price Dynamics
Historical Price (Probability)
Outcome probability
Date
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".
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 [^]. 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 [^]. 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 [^]. These reports indicated that Anthropic was expected to release Mythos AI publicly on June 9, 2026 [^][^]. 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 [^][^]. 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 [^][^][^]. This official release, occurring before July 1, 2026, validated the market's pre-emptive movement [^][^][^]. 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 [^][^][^]. '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 [^][^][^]. 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 [^][^]. 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.
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 Jun 15, 2026 | $0.01 | $1.00 | 1% |
| Before Jul 1, 2026 | $0.03 | $0.98 | 3% |
| Before Aug 1, 2026 | $0.08 | $0.93 | 7% |
| Before Sep 1, 2026 | $0.19 | $0.82 | 18% |
| 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. What competitive pressures from OpenAI or Google could accelerate Anthropic's timeline for a public Mythos release before 2027?
| Funding Round | $65 billion [^][^][^][^][^] |
|---|---|
| Company Valuation | $965 billion [^][^][^][^][^] |
| Claude Fable 5 Public Release | June 9, 2026 [^][^][^][^] |
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 [^][^][^][^][^]. This accelerated development led to Anthropic publicly releasing a version of its Mythos-class model, branded as Claude Fable 5, on June 9, 2026 [^][^][^][^]. 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 [^][^][^][^][^].
A dual-release strategy balanced commercial drivers with safety concerns. Anthropic implemented this approach to manage the competitive environment alongside critical safety considerations [^][^][^][^][^]. 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 [^][^][^][^].
6. 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 Status | Specialized model tier, restricted to approved, vetted partners [^][^] |
|---|---|
| Reason for Restriction | Lacks safety classifiers present in Claude Fable 5 [^][^] |
| Claude Fable 5 Launch Date | June 9, 2026 [^][^] |
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 [^][^].
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 [^][^][^]. This policy guides the company's decisions on model releases rather than serving as a direct block for a particular model name like 'Mythos' [^][^][^]. 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 [^][^][^].
7. How do the capabilities of the publicly available Claude Fable 5 differ from the partner-restricted Claude Mythos 5?
| Release Date | June 9, 2026 (for Fable 5) [^][^] |
|---|---|
| Fable 5 Availability | Generally available via Claude API, Amazon Bedrock, Google Cloud Vertex AI, and Microsoft Foundry [^][^] |
| Mythos 5 Access | Restricted to vetted partners through Project Glasswing, with safeguards lifted [^][^][^] |
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 [^][^][^]. The primary distinction between these two models lies in their respective safety measures and accessibility [^][^][^].
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 [^][^]. 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 [^][^][^].
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 [^][^][^]. Claude Mythos 5 is exclusively available to vetted partners through a dedicated initiative known as Project Glasswing [^][^][^].
8. What is the publicly communicated roadmap for Project Glasswing, and what partner feedback would signal a move towards a broader release?
| Project Name | Project Glasswing (Anthropic initiative) [^] |
|---|---|
| Model Used | Claude Mythos Preview [^][^][^] |
| Current Access Status | Restricted to authorized partners [^][^][^][^][^] |
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 [^][^][^]. Currently, access to Mythos-class models is limited to authorized partners because Anthropic has not yet developed sufficient safeguards to prevent potential misuse [^][^][^][^][^].
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 [^][^][^]. A general release of Mythos-class models is planned for the future, contingent upon the development and implementation of these necessary safeguards [^][^][^][^]. Prediction markets have shown activity regarding the public release of Mythos, with some indicating high probability or resolution by June 9, 2026 [^][^][^][^].
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 [^][^][^][^].
9. 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 Release | June 9, 2026 [^] |
|---|---|
| US AI Regulation Framework | Voluntary 30-day pre-release evaluation [^][^][^] |
| UK AI Regulation Approach | Voluntary, standards-based [^] |
Emerging US and UK AI regulations are voluntary, not mandatory, for Anthropic. Anthropic publicly released its "Mythos 5" frontier model on June 9, 2026 [^]. 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 [^][^][^][^].
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 [^][^][^]. 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 [^][^].
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 [^][^][^][^].
10. 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 [^] [^] [^] . 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 [^][^][^].
Claude Fable 5 is a Mythos-class model that incorporates specific safety guardrails, enabling its general availability to enterprise customers and paid subscribers [^] [^] . Claude Mythos 5 is the underlying model with safeguards lifted in certain areas, restricted to Project Glasswing participants and select research partners [^][^].
Key Dates & Catalysts
- Expiration: June 22, 2026
- Closes: January 01, 2027
11. Decision-Flipping Events
- Trigger: Anthropic officially released a public-facing version of its Mythos-class model, named Claude Fable 5, on June 9, 2026 [^] [^] [^] .
- Trigger: 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 [^] [^] [^] .
- Trigger: Claude Fable 5 is a Mythos-class model that incorporates specific safety guardrails, enabling its general availability to enterprise customers and paid subscribers [^] [^] .
- Trigger: Claude Mythos 5 is the underlying model with safeguards lifted in certain areas, restricted to Project Glasswing participants and select research partners [^] [^] .
13. Related News
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)
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