GPT-6 Astra vs Claude Opus 5.5 — I compared them across 5 categories. Results are more split than the headlines suggest.Ran GPT-6 Astra and Claude Opus 5.5 head-to-head (coding, price, security, context). Opus 5.5 wins coding + value, Astra wins the frontier stuff.

This story is from 2026-09-23. It is preserved in the archive; the latest stories are on the live feed.

Both dropped in September 2026 (Astra Sept 3, Opus 5.5 Sept 22), so I put them side by side across the categories that actually matter for building. Sharing the numbers + sources in case it's useful to anyone deciding between them. Coding (Terminal-Bench 4.0) Opus 5.5: 66.4% GPT-6 Astra: 57.9% Opus…

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1. 2026-09-23 14:37 · r/artificial
   GPT-6 Astra vs Claude Opus 5.5 — I compared them across 5 categories. Results are more split than the headlines suggest.Ran GPT-6 Astra and Claude Opus 5.5 head-to-head (coding, price, security, context). Opus 5.5 wins coding + value, Astra wins the frontier stuff.