ImprovementModels ·
Claude Opus 5.5
What it does
Claude Opus 5.5 is available in the Agent Builder model picker.
Before this
An addition. Builders can choose this model alongside the existing models.
Why it matters
Choose another model for complex documents and agentic work.
The specs
Choose Claude Opus 5.5 in the Agent Builder model picker, then select Use Claude Opus 5.5.
999,000-token context window and a 128,000-token output ceiling.
Supports text, image input, and Actions. Reasoning options: Fastest, Fast, Smart, Smartest, or Maximum; there is no Off option.