OpenAI Codex CLI rust-v0.42.0
OpenAI Codex CLI rust-v0.42.0 was released on .
Summary
Notable Changes - Experimental Rust SDK–based MCP client introduced (4252)
Release Context
- This was the 39th OpenAI Codex CLI release of 2025 tracked by Havoptic.
- It shipped 2 days after OpenAI Codex CLI rust-v0.41.0 (September 24, 2025).
Shipped around the same time
Within 3 days of this release, other AI coding tools also shipped:
- Claude Code v2.0.0 (September 29, 2025)
- Cursor v1.7 (September 29, 2025)
- Devin Desktop v1.12.12 (September 29, 2025)
- Gemini CLI v0.8.0-nightly.20250927.19400ba8 (September 27, 2025)
- GitHub Copilot CLI v0.0.328 (September 26, 2025)
Compare OpenAI Codex CLI: vs Claude Code · vs Cursor · vs Gemini CLI · vs Kiro CLI · vs GitHub Copilot CLI · vs Devin Desktop · vs Antigravity CLI
Other Recent OpenAI Codex CLI Releases
- rust-v0.147.0 (August 7, 2026)
- rust-v0.146.1 (August 5, 2026)
- rust-v0.146.0 (July 29, 2026)
- rust-v0.145.0 (July 21, 2026)
- rust-v0.144.6 (July 18, 2026)
All OpenAI Codex CLI releases · All AI coding tool releases on Havoptic