Understand this story
Claude Code v2.1.316 is released, adding environment variables such as CLAUDE_CODE_DISABLE_ULTRATHINK to disable the ultrathink keyword. The same version also adds a grouped shared monthly budget (pooled_budget) and a layered policy mode to the Claude apps gateway. This version announces that Opus 4.8's fast mode will be deprecated starting October 30, 2026, and removed on November 30, after which related requests will return errors with no fallback, and users must migrate to Opus 5.5 to retain acceleration. In addition, it fixes issues such as residual shell commands after exiting on macOS/Linux, and failed switching when models are unavailable on Vertex AI and Bedrock. There are currently no further developments.
AI-generated from public reports
Latest development · Report
Claude Code v2.1.316 ReleasedDevelopments
1 confirmed developments
Claude Code adds an environment variable to disable the ultrathink keyword
Source:Claude Code：GitHub Releases
Reports and discussion timeline
Browse reports and discussion by time. Their evidence levels remain distinct.
Oct 31
Claude Code：GitHub ReleasesFirst-party
Claude Code v2.1.316 Released
Claude Code v2.1.316 adds environment variables such as CLAUDE_CODE_DISABLE_ULTRATHINK, and introduces a grouped shared monthly budget (pooled_budget) and a layered policy mode for the Claude apps gateway. This version announces that Opus 4.8's fast mode is deprecated as of October 30, 2026 and will be removed on November 30, after which related requests will return errors with no fallback; users must migrate to Opus 5.5 to retain acceleration. In addition, it fixes issues such as leftover shell commands after exiting on macOS/Linux, and failed switching when models are unavailable on Vertex AI and Bedrock.