Claude Code v2.1.42
Claude Code v2.1.42 was released on .
Summary
- Improved startup performance by deferring Zod schema construction - Improved prompt cache hit rates by moving date out of system prompt - Added one-time Opus 4.6 effort callout for eligible users...
Release Context
- This was the 35th Claude Code release of 2026 tracked by Havoptic.
- It shipped 1 day after Claude Code v2.1.41 (February 13, 2026).
Shipped around the same time
Within 3 days of this release, other AI coding tools also shipped:
- GitHub Copilot CLI v0.0.410 (February 14, 2026)
- Kiro CLI v1.26.0 (February 13, 2026)
- GitHub Copilot CLI v0.0.409 (February 12, 2026)
- OpenAI Codex CLI rust-v0.101.0 (February 12, 2026)
- OpenAI Codex CLI rust-v0.100.0 (February 12, 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
- Improved startup performance by deferring Zod schema construction
- Improved prompt cache hit rates by moving date out of system prompt
- Added one-time Opus 4.6 effort callout for eligible users
- Fixed /resume showing interrupt messages as session titles
- Fixed image dimension limit errors to suggest /compact
Other Recent Claude Code Releases
- v2.1.232 (August 13, 2026)
- v2.1.231 (August 13, 2026)
- v2.1.229 (August 12, 2026)
- v2.1.228 (August 11, 2026)
- v2.1.227 (August 10, 2026)
All Claude Code releases · All AI coding tool releases on Havoptic