Unverified50% confidencePredictionExact time
Willison's initial impression is that GPT-6 Astra is not as good as Opus 5.5 at grasping "fun," and he expects OpenAI to catch up by the end of the year.
1
Sources
50%
Confidence
Short-term (~14 days)
Relevance
10/28/2026
First Seen
Valid until: 11/11/2026
Sources
Related Entities
Related Claims
UnverifiedGPT-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.77% similarUnverifiedClaude Opus 5.5 is a frontier-level intelligence model that provides a level of intelligence comparable to top models such as GPT-6 Astra, but is faster and cheaper.76% similarUnverifiedIn the optimization workflow of web-edit 0.1a1, GPT-6 Astra was responsible for diagnosing performance bottlenecks, Claude Opus 5.5 was responsible for rewriting the code, and Simon Willison was responsible for reviewing, merging and releasing the results.75% similarUnverifiedIn 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.74% similarUnverifiedThe comparison targets chosen in the model card include GPT-6 Astra, Claude Fable 5.1, and Claude Opus 5.5, all evaluated at maximum reasoning effort.74% similar
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