Claude Code v2.1.66
Claude Code v2.1.66 was released on .
Summary
- Reduced spurious error logging
Release Context
- This was the 51st Claude Code release of 2026 tracked by Havoptic.
- It shipped 4 days after Claude Code v2.1.63 (February 28, 2026).
Shipped around the same time
Within 3 days of this release, other AI coding tools also shipped:
- GitHub Copilot CLI v1.0.2 (March 6, 2026)
- GitHub Copilot CLI v0.0.423 (March 6, 2026)
- GitHub Copilot CLI v0.0.422 (March 5, 2026)
- OpenAI Codex CLI rust-v0.111.0 (March 5, 2026)
- OpenAI Codex CLI rust-v0.110.0 (March 5, 2026)
Compare Claude Code: vs OpenAI Codex CLI · vs Cursor · vs Gemini CLI · vs Kiro CLI · vs GitHub Copilot CLI · vs Devin Desktop · vs Antigravity CLI
Release Notes
- Reduced spurious error logging
Other Recent Claude Code Releases
- v2.1.215 (July 19, 2026)
- v2.1.214 (July 18, 2026)
- v2.1.212 (July 16, 2026)
- v2.1.211 (July 15, 2026)
- v2.1.210 (July 14, 2026)
All Claude Code releases · All AI coding tool releases on Havoptic