Opus 5.5 launch compared against GPT-6 Astra

Priy @alwayspriyeshOriginally posted 2026.09.23

Open original on X

ChatGPT users watching Opus 5.5 drop: • it beats Astra in agentic coding • 1846 vs 1542 on GDPval-AA • ~20% of Astra’s cost on FrontierCode • 30%+ faster than Opus 5 • higher Claude usage limits Anthropic didn’t drop a model. They dropped a bomb on ChatGPT users 😭

This post quotes another post: “Anthropic releases Claude Opus 5.5 model”