Claude Code 2.1.311 and 2.1.312 Add Effort Controls and Clearer Errors
Anthropic released Claude Code 2.1.311 on October 26, 2026 and 2.1.312 the following day, neither introducing a new model. The 2.1.311 update maps the ultrathink keyword to xhigh effort on several named models via the API, and can raise effort mid-turn. The 2.1.312 release lets users set an effort level for cloud routines in the model picker and renames the usage window to "5-hour limit." Together the releases include 78 bug fixes, mostly affecting subagents, hooks, and VS Code reliability. The update also caps prompt and agent hooks at 24 concurrent runs per session and improves the guidance shown for "Connection dropped" errors.
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