Anthropic's Claude Fable 5.1, released September 1, leads independent leaderboards such as BenchAlign with an 84.58 score, ahead of OpenAI's GPT-6 Astra at roughly 83.8, driving the 98.7% market-implied odds for Anthropic holding the top AI model by month-end. Recent benchmark updates highlight its strengths in agentic tasks, coding, and knowledge work, reinforcing trader consensus on its current frontier position. With the resolution date only days away, limited room remains for a competitor to ship and validate a superior model. OpenAI or another lab could still narrow the gap through a rapid update or revised evaluation methodology, though such shifts would need swift, credible demonstration to alter the outcome.
Resumen experimental generado por IA con datos de Polymarket. Esto no es asesoramiento de trading y no influye en cómo se resuelve este mercado. · ActualizadoAnthropic secures top spot on Arena Text Arena Overall leaderboard at September 30 snapshot
Anthropic's Claude Fable 5.1 and related models held the highest rank on the Arena Text Arena Overall leaderboard at the September 30, 2026, 12:00 PM ET snapshot, confirming Anthropic as the company with the best AI model at the end of September.
Anthropic's market price peaks at 98% ahead of September 30 leaderboard check
Anthropic rises to 98%1%
Anthropic's market price reached a high of 98% on September 20, 2026, reflecting strong market consensus that Anthropic would maintain the top position on the Arena.ai Text Arena overall leaderboard at the end of September.






















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