Claude Opus 5.5 and Sonnet 5.5 outpace rivals ahead of OpenAI Dev Day

Anthropic's Claude Opus 5.5 and Sonnet 5.5 reportedly outperform OpenAI's Sol and Astra, pressuring OpenAI to stack its Dev Day with 20+ releases. A blogger also claims access to Sonnet-5.5, suggesting a gradual rollout though unconfirmed.

2026-09-29 ~ 2026-09-29 · 3 related posts

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