OpenAI Codex CLI rust-v0.21.0
OpenAI Codex CLI rust-v0.21.0 was released on .
Summary
Fixes abound! - https://github.com/openai/codex/pull/2200 send prompt cache key for better caching (should improve token efficiency!)
Release Context
- This was the 18th OpenAI Codex CLI release of 2025 tracked by Havoptic.
- It shipped 3 days after OpenAI Codex CLI rust-v0.20.0 (August 9, 2025).
Shipped around the same time
Within 3 days of this release, other AI coding tools also shipped:
- Claude Code v1.0.81 (August 14, 2025)
- Gemini CLI v0.1.21 (August 14, 2025)
- Devin Desktop v1.12.1 (August 14, 2025)
- Gemini CLI v0.1.19-nightly.250814.514e883a (August 14, 2025)
- Claude Code v1.0.80 (August 13, 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-v0.142.4 (June 29, 2026)
- rust-v0.142.3 (June 26, 2026)
- rust-v0.142.2 (June 25, 2026)
- rust-v0.142.1 (June 25, 2026)
- rust-v0.142.0 (June 22, 2026)
All OpenAI Codex CLI releases · All AI coding tool releases on Havoptic