Next Mythos-Class Model released by September 15, 2026?

Realized · held to resolution+27%$100 paper stake

Polymarket79¢ → 100¢

Our position · YES79¢ → 100¢

Signal endedSep 1

Forecast updatedAug 30

Aug 29 forecast

Converging routing reports and Anthropic’s references to additional Mythos-class candidates indicate launch preparation, so a qualifying release by the deadline is likely.

Several late-August reports describe new checkpoints and background routing toward a Fable update, while Anthropic’s own dashboard references additional Mythos-class models. Together, these signs point to an advanced release candidate. Meaningful uncertainty remains because Anthropic has not officially confirmed the reported model, and testing or safety reviews could still delay public access.

Points to YES

Background routing toward Fable 5.1 suggests deployment has advanced beyond isolated checkpoint testing, shortening the path to a public launch.
On August 27, users were reportedly being routed from Claude Fable 5 to Fable 5.1 on the web.
Anthropic’s vulnerability dashboard references additional Mythos-class models, indicating that qualifying candidates beyond the already named models exist.
On August 26, Anthropic’s dashboard said its latest candidate set included findings from other Mythos-class models alongside Mythos Preview and other Claude models.
Anthropic previously signaled that more capable models were coming within months, making a late-summer successor consistent with its stated product timeline.
On June 9, Anthropic said more capable models were expected in the coming months.

Points to NO

The absence of official confirmation or standard launch materials leaves a substantial risk that the reported checkpoint never becomes a named, publicly accessible Mythos-class release.
On August 27, the surfaced checkpoints reportedly had no Anthropic model card, public API identifier, official pricing, or shipping-product announcement for Fable 5.1.
Anthropic’s restricted handling of current Mythos-class uses shows that safety-sensitive capabilities can remain gated, potentially delaying access for the general public.
On August 27, Anthropic was enrolling selected participants in a government-partnered Mythos-class life-sciences program rather than offering general access.
Anthropic’s decision not to release a stronger internal model shows that performance gains alone do not ensure external deployment, preserving last-minute evaluation risk.
On August 19, Anthropic said internal Model 2 had not completed its standard external-release evaluations and was not currently planned for external release.

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