Unverified50% confidenceBenchmarkExact time
In Anthropic's official comparison, Opus 5.5 surpassed Anthropic's previous flagship model on most tasks and beat OpenAI's GPT-6 Astra on most tasks.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/7/2026
First Seen
Valid until: 1/5/2027
Sources
Related Entities
Related Claims
UnverifiedAccording to Anthropic's official radar chart, Opus 5.5 only falls behind GPT-6 Astra in workflow and scientific research tasks.78% similarVerifiedGPT-6 Astra is notably different from previous model iterations, being powerful in certain respects while showing little improvement or even appearing to regress in other scenarios.71% similarVerifiedOpenAI has positioned GPT-6 Astra as 'a generational leap in capability.'70% similarUnverifiedGPT-6 Astra outperformed Fable 5.1 on the hardest benchmarks selected by Anthropic to showcase Fable 5.1 (such as Terminal Bench Science and Automation Bench), and at a lower cost.69% similarUnverifiedAccording to OpenAI's Noam Brown, the model involved is similar in scale to GPT-5.6-level, is a model used solely for internal research and trained to be highly persistent and diligent, and is not the next-generation Astra series.69% similar
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