InvestorOdds Share feedback ↗

Artificial intelligence Open at last refresh

Will the next Fable model (5.2+) debut with a Humanity's Last Exam score of 55% or higher?

Next Fable Model (5.2+): Humanity's Last Exam Debut?

Provider end date; confirm observation window in the rules.

Provider end date 1 Jul 2027Liquidity $3.1kLifetime volume $2.3kSource Polymarket

Contract resolution rules

AI-assisted explanation

Market resolves Yes if the next Anthropic Claude Fable model (5.2+) added to the Humanity's Last Exam results at agi.safe.ai shows HLE Accuracy at or above the specified percentage at 12:00 PM ET on the calendar date following its first appearance on the site.

Conditions for a winning outcome

A model qualifies if its name or identifier includes 'Fable' and it is designated version 5.2 or higher, regardless of capitalization or surrounding prefixes, suffixes, dates, or descriptors. This includes whole-number generations like Claude Fable 6, and models named in the same manner as Claude Fable 5 or Claude Fable 5.1 at version 5.2+. It must be newly added to the HLE results at agi.safe.ai. Whether the model was previously released, publicly accessible, in beta, or otherwise available before appearing on the site is irrelevant. If multiple qualifying models are added on the same calendar date (ET), only the one with the highest HLE Accuracy is used. The displayed 'HLE Accuracy' on the results chart determines resolution, not Calibration Error, chart position, or other scores.

Exclusions and exceptions

Models without 'Fable' in the name (e.g., Claude Mythos 5.1) or with version below 5.2 (e.g., Claude Fable 5.1) do not qualify. A qualifying model that is removed and not re-added before 12:00 PM ET on the calendar date following its first appearance does not count. Models added to the results on the calendar date following the initial qualifying model's first appearance are not considered.

Timing & resolution

If no qualifying model is added by June 30, 2027, 11:59 PM ET, the market resolves No. If the source is unavailable at 12:00 PM ET on the calendar date following first appearance, resolution uses the first subsequent availability on the site. If still unavailable through the end of the seventh day after first appearance, the market resolves No.

Ambiguities in the rules

The source does not precisely define 'first appears on the site' (e.g., whether a brief or test listing counts). It also does not specify how to verify removal or re-addition if the site is temporarily down, though the fallback rules address unavailability through the seventh-day window.

AI-assisted explanation of this version of the source rules. It does not replace the provider’s terms.

Original resolution rules
This market will resolve to "Yes" if the next Anthropic Claude Fable model (5.2+) added to the Humanity's Last Exam results at https://agi.safe.ai/ has an HLE Accuracy of at least the specified percentage at 12:00 PM ET on the calendar date following the date on which it first appears on the site. Otherwise, this market will resolve to "No". A qualifying model must have a name or model identifier that includes "Fable" and be designated as version 5.2 or higher, regardless of capitalization or surrounding prefixes, suffixes, dates, or descriptors. For example, a version 5.2 or higher named in the same manner as Claude Fable 5 or Claude Fable 5.1 would qualify, including a new whole-number generation such as Claude Fable 6, while models whose name does not include "Fable" or which retain a version designation below 5.2, such as Claude Fable 5.1 or Claude Mythos 5.1, will not qualify. The percentage displayed as "HLE Accuracy" for the model in its result card on the "AI Progress on Humanity's Last Exam" chart at https://agi.safe.ai/ will be used to resolve this market. This market will resolve solely based on the displayed HLE Accuracy, regardless of the model's Calibration Error, chart position, other configuration scores, or any underlying granular or unrounded data presented elsewhere. If multiple qualifying models are added to the Humanity's Last Exam results on the same calendar date (ET), the model with the highest HLE Accuracy will be used for resolution. Models added to the results on the calendar date following the initial qualifying model's first appearance will not be considered. If a model is first added to the Humanity's Last Exam results but is subsequently removed and not re-added, such that it is not displayed on the site at 12:00 PM ET on the calendar date following its first appearance, its appearance will not qualify as added to the Humanity's Last Exam results. A qualifying model must be newly added to the Humanity's Last Exam results at https://agi.safe.ai/. Whether the model was previously released, publicly accessible, in beta, or otherwise available before appearing on the site is irrelevant for this market. The resolution source for this market is the official Humanity's Last Exam website found at https://agi.safe.ai/. If this resolution source is unavailable at 12:00 PM ET on the calendar date following the date on which the qualifying model first appears on the site, this market will resolve based on the first subsequent instance at which the model's HLE Accuracy becomes available on the site. If it remains unavailable through the end of the seventh day after the qualifying model first appears on the site or if no qualifying model is added by June 30, 2027, 11:59 PM ET, this market will resolve to "No".

Outcome prices and implied probabilities

Compare the quoted price for each outcome. The amounts below assume a $1 payout for a winning share.

Yes83.5%
83.50¢ indicative price per $1 winning payout
No16.5%
16.50¢ indicative price per $1 winning payout

Prices describe trading, not certainty or an independent forecast. Bid / ask for the first outcome: 0.83 / 0.84. Market liquidity is not guaranteed fill size.

Fetched 2026-10-23T20:00:14+00:00 · Provider updated 2026-10-23T19:58:27.16849Z

Event contracts and stock returns

A company’s share price, this event’s probability and the return on an event contract answer different questions. A correct company thesis can still miss a contract’s deadline or its exact conditions.

Explore more artificial intelligence →