Claude Code v2.1.39
Claude Code v2.1.39 was released on .
Summary
- Added guard against launching Claude Code inside another Claude Code session - Fixed Agent Teams using wrong model identifier for Bedrock, Vertex, and Foundry customers - Fixed a crash when MCP t...
Release Context
- This was the 33rd Claude Code release of 2026 tracked by Havoptic.
- It shipped 1 day after Claude Code v2.1.38 (February 10, 2026).
Shipped around the same time
Within 3 days of this release, other AI coding tools also shipped:
- 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)
- GitHub Copilot CLI v0.0.408 (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
- Added guard against launching Claude Code inside another Claude Code session
- Fixed Agent Teams using wrong model identifier for Bedrock, Vertex, and Foundry customers
- Fixed a crash when MCP tools return image content during streaming
- Improved model error messages for Bedrock/Vertex/Foundry users with fallback suggestions
- Improved terminal rendering performance
- Fixed fatal errors being swallowed instead of displayed
- Fixed process hanging after session close
- Fixed character loss at terminal screen boundary
- Fixed blank lines in verbose transcript view
Other Recent Claude Code Releases
- v2.1.216 (July 20, 2026)
- v2.1.215 (July 19, 2026)
- v2.1.214 (July 18, 2026)
- v2.1.212 (July 16, 2026)
- v2.1.211 (July 15, 2026)
All Claude Code releases · All AI coding tool releases on Havoptic