Unverified50% confidenceFactExact time
In the SWE-Marathon evaluation, GPT-6 Astra and Claude Fable 5.1 used the Codex and Claude Code execution systems respectively, so this project is not a controlled comparison under a unified harness.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/19/2026
First Seen
Valid until: 1/17/2027
Sources
Related Entities
Related Claims
UnverifiedIn 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.78% similarUnverifiedGPT-6.1 Astra was originally set to debut at a developer conference and was planned for integration into the coding tool Codex.76% 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.76% similar
Cite This Claim
Stable URI
https://kongchang.com/claim/1067540API
curl https://kongchang.com/api/v1/knowledge/claims/1067540MCP
get_claim(id=1067540)