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.
Contract resolution rules
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
Outcome prices and implied probabilities
Compare the quoted price for each outcome. The amounts below assume a $1 payout for a winning share.
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
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