Gemini CLI vs OpenAI Codex CLI — Feature Comparison
Quick answer: Gemini CLI supports 18 of 18 tracked features; OpenAI Codex CLI supports 16 of 18. Matrix last updated September 18, 2026.
Verdict: Gemini CLI vs Codex CLI
Gemini CLI is the better all-around choice for most developers today, but OpenAI Codex CLI is the stronger option if you prioritize rapid iteration and are comfortable on the cutting edge. Gemini CLI covers all 18 tracked features, including multi-file editing and JetBrains IDE integration, making it a more complete toolchain for teams that work across multiple editors and need to coordinate changes spanning several files at once. Its release history — 312 total releases with a steady cadence — signals a mature, broadly-invested project that has been refined over a longer trajectory. OpenAI Codex CLI, by contrast, has shipped 30 releases in the most recent 90-day window, nearly double Gemini CLI's pace of 16, suggesting an aggressive push to close gaps and ship new capabilities quickly; developers who want to ride that momentum may find it rewarding. The two unsupported features in Codex CLI — multi-file editing and JetBrains integration — are non-trivial omissions if your workflow depends on either; JetBrains users in particular will find Gemini CLI's native plugin support significantly smoother. That said, feature count alone is not the whole story: Codex CLI's velocity indicates a team actively investing in the product, and the gap may narrow quickly. Teams that live primarily in VS Code or the terminal and do not require JetBrains support will find both tools competitive, making release cadence and ecosystem fit the tiebreaker.
Choose Gemini CLI if: Choose Gemini CLI if you need JetBrains IDE integration, rely on multi-file editing workflows, or want a feature-complete tool with a long, stable release history behind it.
Choose OpenAI Codex CLI if: Choose OpenAI Codex CLI if you work primarily in the terminal or VS Code, want the fastest-moving release cadence to get new capabilities sooner, and can tolerate the occasional rough edge that comes with rapid iteration.
Key differences
- Gemini CLI supports all 18 tracked features; Codex CLI supports 16, missing multi-file editing and JetBrains integration
- Codex CLI is shipping at nearly twice the release cadence in recent months, signaling faster active development
- Gemini CLI has a substantially larger total release history, reflecting a longer maturation period
- JetBrains users have native support only in Gemini CLI — a decisive factor for that ecosystem
- Both tools are competitive for terminal and VS Code-centric workflows, making cadence and feature fit the primary differentiator
At a glance
| Tool | Latest version | Release date | Releases tracked |
|---|---|---|---|
| Gemini CLI | v0.60.0 | September 15, 2026 | 315 |
| OpenAI Codex CLI | rust-v0.155.0 | September 17, 2026 | 160 |
Core Editing
Multi-file editing, streaming, undo capabilities
| Feature | Gemini CLI | Codex CLI |
|---|---|---|
| Multi-file Editing — Edit multiple files in a single operation | ✓ since v0.22.0 | — |
| Streaming Output — Real-time streaming of AI responses | ✓ since v0.55.1 | ✓ since rust-v0.155.0 |
| Undo/Redo — Ability to undo and redo changes | ✓ since v0.58.0 | ✓ since rust-v0.155.0 |
| Diff View — Visual comparison of changes | ✓ since v0.60.0 | ✓ since rust-v0.155.0 |
Terminal Integration
Shell and command execution support
| Feature | Gemini CLI | Codex CLI |
|---|---|---|
| Command Execution — Run shell commands | ✓ since v0.60.0 | ✓ since rust-v0.155.0 |
| Shell Integration — Integration with user shell environment | ✓ (Mentions of environment changes, workspace protection, and Cloud Workstations integration (v0.57.0) suggest shell/enviro) | ✓ since rust-v0.150.0 |
| Background Tasks — Run tasks in background | ✓ since v0.49.0 | ✓ since rust-v0.155.0 |
MCP Support
Model Context Protocol server and client capabilities
| Feature | Gemini CLI | Codex CLI |
|---|---|---|
| MCP Client — Connect to MCP servers | ✓ since v0.60.0 | ✓ since rust-v0.155.0 |
| MCP Server — Expose as MCP server | ✓ since v0.44.0 | ✓ since rust-v0.155.0 |
| Custom Tools — Define and use custom tools | ✓ since v0.30.0 | ✓ since rust-v0.147.0 |
IDE Integrations
VS Code, JetBrains, and other editor support
| Feature | Gemini CLI | Codex CLI |
|---|---|---|
| VS Code — Visual Studio Code integration | ✓ since v0.55.1 | ✓ since rust-v0.136.0 |
| JetBrains — IntelliJ/WebStorm integration | ✓ since v0.41.0 | — |
| Vim/Neovim — Vim or Neovim integration | ✓ since v0.45.0 | ✓ since rust-v0.154.0 |
| Web UI — Browser-based interface | ✓ since v0.60.0 | ✓ since rust-v0.155.0 |
Agentic Features
Planning, tool use, and autonomous capabilities
| Feature | Gemini CLI | Codex CLI |
|---|---|---|
| Planning Mode — Plan before executing changes | ✓ since v0.55.1 | ✓ since rust-v0.155.0 |
| Autonomous Mode — Extended autonomous operation | ✓ since v0.57.0 | ✓ since rust-v0.155.0 |
| Task Decomposition — Break complex tasks into steps | ✓ since v0.55.1 | ✓ since rust-v0.155.0 |
| Context Management — Manage context across conversations | ✓ since v0.58.0 | ✓ since rust-v0.155.0 |
Feature timeline: who shipped first
First release where Gemini CLI and Codex CLI each shipped a notable feature, and which tool led.
| Feature | Gemini CLI | Codex CLI | Who led |
|---|---|---|---|
| Custom Slash Commands | February 10, 2026 | August 20, 2025 | Codex CLI first, 175d ahead |
| Subagents / Parallel Agents | April 1, 2026 | January 25, 2026 | Codex CLI first, 66d ahead |
| Sandboxing / Permission Modes | — | August 7, 2025 | only Codex CLI |
| Background Tasks | — | September 9, 2026 | only Codex CLI |
| Hooks | January 14, 2026 | May 8, 2026 | Gemini CLI first, 114d ahead |
| Skills / Plugins | January 21, 2026 | December 10, 2025 | Codex CLI first, 41d ahead |
| Project Memory Files | — | February 12, 2026 | only Codex CLI |
| MCP Support | January 7, 2026 | July 23, 2025 | Codex CLI first, 168d ahead |
| Extended Thinking | — | July 9, 2025 | only Codex CLI |
| Voice Input | — | February 25, 2026 | only Codex CLI |
| Planning Mode | — | January 25, 2026 | only Codex CLI |
| Image / Vision Input | — | December 2, 2025 | only Codex CLI |
| Headless / Non-interactive Mode | — | July 19, 2025 | only Codex CLI |
| Web Search / Fetch | — | June 9, 2026 | only Codex CLI |
| Checkpoints / Rewind | — | December 15, 2025 | only Codex CLI |
| Git / PR Integration | — | May 7, 2026 | only Codex CLI |
| Todo / Task List | — | May 21, 2026 | only Codex CLI |
Release velocity
Havoptic tracks 315 Gemini CLI releases and 160 Codex CLI releases. See release frequency charts for side-by-side velocity analysis, or browse the Gemini CLI changelog and OpenAI Codex CLI changelog.
Data source
Feature data is maintained in feature-matrix.json under a CC-BY-4.0 license. Release data comes from releases.json. Both are updated daily. See the methodology page for details on sourcing and human review.