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Will the next Fable model (5.2+) debut with a Humanity's Last Exam score of 50% 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 $741Lifetime volume $5.9kSource Polymarket

Contract resolution rules

AI-assisted explanation

Predicts whether the next Claude Fable 5.2+ model scores 50%+ HLE Accuracy on agi.safe.ai.

Conditions for a winning outcome

Resolves Yes if a model whose name includes Fable and version is 5.2 or higher is newly added to the HLE results at agi.safe.ai, and its displayed HLE Accuracy is at least 50% at 12:00 PM ET on the calendar day after first appearance. If multiple qualifying models are added the same day (ET), the highest HLE Accuracy is used. If the site is unavailable at the deadline, resolution waits until the first subsequent instance the model's HLE Accuracy becomes available. Models added on the calendar date following the initial qualifying model's first appearance are excluded.

Exclusions and exceptions

Resolves No if the qualifying model's displayed HLE Accuracy is below 50%, if it is removed and not re-added such that it is not displayed at 12:00 PM ET on the calendar date following its first appearance, if no qualifying Fable 5.2+ model is added by June 30, 2027 11:59 PM ET, or if the site remains unavailable through the seventh day after first appearance.

Timing & resolution

12:00 PM ET on the calendar date following the qualifying model's first appearance on agi.safe.ai, with a hard no-event date of June 30, 2027 11:59 PM ET and a seven-day fallback after first appearance.

Ambiguities in the rules

The source clearly defines the relevant model as the first qualifying model to appear (initial qualifying model's first appearance) and sets an explicit hard cutoff of June 30, 2027 11:59 PM ET, after which no qualifying model can trigger resolution. No material ambiguity remains.

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.

Yes97.6%
97.60¢ indicative price per $1 winning payout
No2.4%
2.40¢ indicative price per $1 winning payout

Prices describe trading, not certainty or an independent forecast. Bid / ask for the first outcome: 0.961 / 0.991. Market liquidity is not guaranteed fill size.

Fetched 2026-10-24T14:00:09+00:00 · Provider updated 2026-10-24T13:58:39.369499Z

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