OpenAI Codex CLI rust-v0.91.0
OpenAI Codex CLI rust-v0.91.0 was released on .
Summary
Chores - Reduced the maximum allowed number of sub-agents to 6 to tighten resource usage and guardrails in agent fan-out behavior (9861) Changelog Full Changelog: https://github.com/openai/codex/co...
Release Context
- This was the 12th OpenAI Codex CLI release of 2026 tracked by Havoptic.
- It shipped the same day as OpenAI Codex CLI rust-v0.90.0 (January 25, 2026).
Shipped around the same time
Within 3 days of this release, other AI coding tools also shipped:
- GitHub Copilot CLI v0.0.397 (January 28, 2026)
- Claude Code v2.1.22 (January 28, 2026)
- Gemini CLI v0.26.0 (January 28, 2026)
- Claude Code v2.1.21 (January 28, 2026)
- GitHub Copilot CLI v0.0.396 (January 27, 2026)
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
Release Notes
Chores - Reduced the maximum allowed number of sub-agents to 6 to tighten resource usage and guardrails in agent fan-out behavior (9861) Changelog Full Changelog: https://github.com/openai/codex/compare/rust-v0.90.0...rust-v0.91.0 - 9861 chore: half max number of sub-agents @jif-oai
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