Claude Code 2.1.266 Fixes Gateway Configuration Regression

Anthropic rushed out Claude Code 2.1.266 within hours to fix a regression where an undocumented environment variable broke all gateway requests; metadata shows tool definitions account for nearly 70% of prompt tokens.

2026-09-09 ~ 2026-09-09 · 3 related posts

• Claude Code 2.1.266 ships fix for regression that broke LLM gateway and proxy setups — ClaudeCodeLog · 2026-09-09
• Claude Code 2.1.266 token stats: tool definitions eat 69.3% of the prompt — ClaudeCodeLog · 2026-09-09

1 near-duplicate retellings: ClaudeCodeLog