Claude Opus 5.5
The newest Opus, at a fifth less than Opus 5 on both input and output.
A model a workspace can run · gbrain.io
Anthropic
Claude Opus 5.5
The newest Opus, at a fifth less than Opus 5 on both input and output.
- Vendor
- Anthropic
- Released
- Sep 2026
- Model id
- claude-opus-5-5
Opus 5.5 is the newest model in Anthropic’s Opus line. It costs a fifth less than Opus 5 on both input and output, and it holds a million tokens of context.
It thinks before every answer and decides for itself how long.
Best for: everyday hard work, coding and research, for less than Opus 5.
Pick it per workspace from the model settings and switch any time. Inference is included in the plan, or bring a key of the team's own.