**Claude Fable 5.1's recent launch positions it as the clear leader in trader sentiment for the September 21 "best AI model" market.** Anthropic released Claude Fable 5.1 and Mythos 5.1 on September 1, delivering substantial gains in agentic coding, long-horizon reasoning, and research benchmarks such as Terminal-Bench 4.0 (55.8%) and BenchAlign v5, where it scores 82.95—well ahead of Claude Opus 5 and recent OpenAI releases like GPT-6 Astra. This fresh evidence of frontier capability at the high/max effort settings explains the 56.5% implied probability for claude-fable-5.1-max, while the 41% on "Other" reflects uncertainty around competing models and potential last-minute updates before resolution. Opus variants remain low-probability given their July positioning and the new model's superior verified results. With the evaluation date only weeks away, traders are weighting the latest benchmark leadership heavily.
Riepilogo sperimentale generato dall'AI con riferimento ai dati di Polymarket. Questo non è un consiglio di trading e non ha alcun ruolo nella risoluzione di questo mercato. · AggiornatoIl miglior modello di intelligenza artificiale del 21 settembre?
claude-fable-5.1-max 57%
Altro 36%
claude-opus-5-high 3.5%
claude-opus-5-max 2.0%
claude-fable-5.1-max
57%
Altro
36%
claude-opus-5-high
4%
claude-opus-5-max
2%
claude-opus-4-6-high
1%
claude-fable-5.1-max 57%
Altro 36%
claude-opus-5-high 3.5%
claude-opus-5-max 2.0%
claude-fable-5.1-max
57%
Altro
36%
claude-opus-5-high
4%
claude-opus-5-max
2%
claude-opus-4-6-high
1%
Results from the "Rank" column under the "Text Arena | Overall" Leaderboard tab at https://arena.ai/leaderboard/text/overall-no-style-control with style control off (Adjustments: None) and filtered for "Models" will be used to resolve this market.
Note: Models marked “AutoEval” at the applicable check time will not be considered, regardless of whether they display a rank or score.
No new model will be added to this market after market creation. Any model not explicitly listed in this market will be encompassed under the "Other" option.
Models will be ordered primarily by their leaderboard rank at the market’s check time. If two or more models are tied on rank, they will be ordered by their Arena score, including any underlying, unrounded, granular values reflected in the data below the leaderboard. If a tie still remains, alphabetical order of model names as listed in this market group (full string, including suffixes such as “-high” and “-max”) will be used as a final tiebreaker (e.g., if two models remain tied, “claude-opus-5-high” would be ranked ahead of “claude-opus-5-max”). This market will resolve to the model that comes first according to this order.
The resolution source for this market is the arena.ai Text Arena (Overall). If this resolution source is unavailable at check time, this market will remain open until the leaderboard comes back online and will resolve based on the first check after it becomes available. If it becomes permanently unavailable, this market will resolve to "Other".
Mercato aperto: Sep 3, 2026, 10:16 AM ET
Risolutore
0x69c47De9D...Results from the "Rank" column under the "Text Arena | Overall" Leaderboard tab at https://arena.ai/leaderboard/text/overall-no-style-control with style control off (Adjustments: None) and filtered for "Models" will be used to resolve this market.
Note: Models marked “AutoEval” at the applicable check time will not be considered, regardless of whether they display a rank or score.
No new model will be added to this market after market creation. Any model not explicitly listed in this market will be encompassed under the "Other" option.
Models will be ordered primarily by their leaderboard rank at the market’s check time. If two or more models are tied on rank, they will be ordered by their Arena score, including any underlying, unrounded, granular values reflected in the data below the leaderboard. If a tie still remains, alphabetical order of model names as listed in this market group (full string, including suffixes such as “-high” and “-max”) will be used as a final tiebreaker (e.g., if two models remain tied, “claude-opus-5-high” would be ranked ahead of “claude-opus-5-max”). This market will resolve to the model that comes first according to this order.
The resolution source for this market is the arena.ai Text Arena (Overall). If this resolution source is unavailable at check time, this market will remain open until the leaderboard comes back online and will resolve based on the first check after it becomes available. If it becomes permanently unavailable, this market will resolve to "Other".
Risolutore
0x69c47De9D...**Claude Fable 5.1's recent launch positions it as the clear leader in trader sentiment for the September 21 "best AI model" market.** Anthropic released Claude Fable 5.1 and Mythos 5.1 on September 1, delivering substantial gains in agentic coding, long-horizon reasoning, and research benchmarks such as Terminal-Bench 4.0 (55.8%) and BenchAlign v5, where it scores 82.95—well ahead of Claude Opus 5 and recent OpenAI releases like GPT-6 Astra. This fresh evidence of frontier capability at the high/max effort settings explains the 56.5% implied probability for claude-fable-5.1-max, while the 41% on "Other" reflects uncertainty around competing models and potential last-minute updates before resolution. Opus variants remain low-probability given their July positioning and the new model's superior verified results. With the evaluation date only weeks away, traders are weighting the latest benchmark leadership heavily.
Riepilogo sperimentale generato dall'AI con riferimento ai dati di Polymarket. Questo non è un consiglio di trading e non ha alcun ruolo nella risoluzione di questo mercato. · Aggiornato

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