# Objective

- Make Claude Opus 5.5 usable through Anthropic API keys.

## Solution

- Apply Opus 5.5's adaptive-thinking, sampling, tool-choice, Fast mode,
compaction, and prefix-binding requirements through the shared Anthropic
request path.

## Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content adheres to Zed's UI standards
([UX/UI](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
and
[icon](https://github.com/zed-industries/zed/blob/main/crates/icons/README.md)
guidelines)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

---

Release Notes:

- Added Claude Opus 5.5 support to the Anthropic provider.

Co-authored-by: Anant Goel <anant@zed.dev>