Anthropic announced Claude Opus 5.5 on September 22nd!Even though Grok 4.7 just came out yesterday, we already have a new Opus model the very next day.On top of that, OpenAI also released GPT-6, SOL, ...

Longer sessions meet faster, cheaper outputs as Opus 5.5 reduces token use and speeds up professional workflows.

I put ChatGPT-6 and Claude Opus 5.5 through five real-world tests covering writing, reasoning, planning and decision-making.

Do you think you can just change the model name to Claude Opus 5.5 and keep using your previous settings?On September 22, 2026, Anthropic announced Claude Opus 5.5 as a model for long-duration agent ...

However, Anthropic has rolled out Claude Opus 5.5, the first of its newly developed 5.5 series, and the context around it is just as important as the model itself. It is the company’s first new ...