OpenAI Codex CLI rust-v0.40.0
OpenAI Codex CLI rust-v0.40.0 was released on .
Summary
Notable Changes - Default model is now gpt-5-codex (4076)
Release Context
- This was the 37th OpenAI Codex CLI release of 2025 tracked by Havoptic.
- It shipped 5 days after OpenAI Codex CLI rust-v0.39.0 (September 18, 2025).
Shipped around the same time
Within 3 days of this release, other AI coding tools also shipped:
- Devin Desktop v1.12.11 (September 26, 2025)
- Claude Code v1.0.126 (September 26, 2025)
- Gemini CLI v0.7.0-preview.1 (September 25, 2025)
- Claude Code v1.0.124 (September 25, 2025)
- Gemini CLI v0.6.1 (September 25, 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-v0.144.6 (July 18, 2026)
- rust-v0.144.5 (July 16, 2026)
- rust-v0.144.4 (July 14, 2026)
- rust-v0.144.3 (July 13, 2026)
- rust-v0.144.2 (July 13, 2026)
All OpenAI Codex CLI releases · All AI coding tool releases on Havoptic