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Will the next Fable model (5.2+) debut at a score of at least 1540 by June 30, 2027?

Next Fable Model (5.2+): Text Arena Debut?

Screened using the explicit question date; payout timing still follows the rules.

Provider end date 1 Jul 2027Liquidity $4.6kLifetime volume $7.2kSource Polymarket

Contract resolution rules

AI-assisted explanation

Predicts whether the next Fable 5.2+ model on the Arena.AI text leaderboard scores at least 1540 within one day of first appearing, with a July 2027 fallback.

Conditions for a winning outcome

A model qualifies if its name or identifier includes "Fable" and its version is 5.2 or higher (e.g., Claude Fable 6). It must be newly added to the Arena.AI Leaderboard (https://arena.ai/leaderboard/text/overall-no-style-control), displayed without an "AutoEval" label. Its score is taken from the "Score" column under the "Text Arena | Overall" tab with style control off. The market resolves "Yes" if this score is at least 1540 at 12:00 PM ET on the calendar date following the date the model first appears. If multiple models are added on the same ET calendar date, the highest-scoring one is used; models added on the calendar date following the initial qualifying model's first appearance are not considered.

Exclusions and exceptions

The market resolves "No" if: the model is removed and not re-added before the 12:00 PM ET check; the leaderboard is unavailable at that check time and no subsequent score becomes available within seven days after the model's first appearance (the source attempts resolution at the first subsequent available instance before defaulting to "No"); or no qualifying Fable 5.2+ model appears by June 30, 2027, 11:59 PM ET. Models named without "Fable" or with versions below 5.2 (e.g., Claude Fable 5.1, Claude Mythos 5.1) do not qualify. Models marked "AutoEval" are excluded.

Timing & resolution

The primary check is 12:00 PM ET on the calendar day after the qualifying model first appears. The final fallback deadline is June 30, 2027, 11:59 PM ET. The provider end date is 2027-07-01T03:59:00Z, which equals 11:59 PM ET on June 30, 2027 (EDT, UTC-4), matching the rule's stated cutoff.

Ambiguities in the rules

The exact meaning of "first appears on the leaderboard" is not defined for models visible but not yet officially added, and the source does not clarify whether a model briefly visible then removed qualifies. The seven-day fallback window is bounded; it is unclear what happens if the source recovers after that window but before the June 30 cutoff. Whether a model that is newly added but later removed and re-added qualifies on its second addition is not addressed.

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 Arena.AI Leaderboard (https://arena.ai/leaderboard/text/overall-no-style-control) has at least the specified score at 12:00 PM ET on the calendar date following the date on which it first appears on the leaderboard. 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. Results from the "Score" column under the "Text Arena | Overall" Leaderboard tab at https://arena.ai/leaderboard/text/overall-no-style-control with style control off will be used to resolve this market. This market will resolve solely based on the specified score in the Score column of the leaderboard, regardless of any underlying granular or unrounded data presented elsewhere. A model marked "AutoEval" will not be considered added to the leaderboard. Only scores displayed without the "AutoEval" label will be considered. If multiple models are added to the leaderboard on the same calendar date (ET), the highest-scoring model will be used for resolution. Models added to the leaderboard on the calendar date following the initial qualifying model's first appearance will not be considered. If a model is first added to the Arena.AI Leaderboard but is subsequently removed and not re-added, such that it is not displayed on the leaderboard at 12:00 PM ET on the calendar date following its first appearance, its appearance will not qualify as added to the Arena.AI Leaderboard. A qualifying model must be newly added to the Arena.AI Leaderboard. Whether the model was previously released, publicly accessible, in beta, or otherwise available before appearing on the leaderboard is irrelevant for this market. The resolution source for this market is the Chatbot Arena LLM Leaderboard found at https://arena.ai/leaderboard/text/overall-no-style-control. 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 leaderboard, this market will resolve based on the first subsequent instance at which such a score becomes available on the leaderboard. If it remains unavailable through the end of the seventh day after the qualifying model first appears on the leaderboard or if no qualifying model release occurs 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.

Yes19.5%
19.50¢ indicative price per $1 winning payout
No80.5%
80.50¢ indicative price per $1 winning payout

Prices describe trading, not certainty or an independent forecast. Bid / ask for the first outcome: 0.19 / 0.2. Market liquidity is not guaranteed fill size.

Fetched 2026-10-23T16:00:09+00:00 · Provider updated 2026-10-23T15:58:05.90581Z

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