Grok Build vs OpenAI Codex CLI — Feature Comparison
Quick answer: Grok Build supports 0 of 0 tracked features; OpenAI Codex CLI supports 17 of 18. Matrix last updated August 29, 2026.
At a glance
| Tool | Latest version | Release date | Releases tracked |
|---|---|---|---|
| Grok Build | v1.0.5 | August 15, 2026 | 118 |
| OpenAI Codex CLI | rust-v0.151.0 | August 29, 2026 | 150 |
Core Editing
Multi-file editing, streaming, undo capabilities
| Feature | Grok | Codex CLI |
|---|---|---|
| Multi-file Editing — Edit multiple files in a single operation | — | ✓ (Implied by code editing capabilities and multi-session/multi-agent work, though not explicitly stated for single-operati) |
| Streaming Output — Real-time streaming of AI responses | — | ✓ since rust-v0.150.0 |
| Undo/Redo — Ability to undo and redo changes | — | ✓ since rust-v0.149.0 |
| Diff View — Visual comparison of changes | — | ✓ since rust-v0.151.0 |
Terminal Integration
Shell and command execution support
| Feature | Grok | Codex CLI |
|---|---|---|
| Command Execution — Run shell commands | — | ✓ since rust-v0.150.0 |
| Shell Integration — Integration with user shell environment | — | ✓ since rust-v0.150.0 |
| Background Tasks — Run tasks in background | — | ✓ since rust-v0.150.0 |
MCP Support
Model Context Protocol server and client capabilities
| Feature | Grok | Codex CLI |
|---|---|---|
| MCP Client — Connect to MCP servers | — | ✓ since rust-v0.151.0 |
| MCP Server — Expose as MCP server | — | ✓ since rust-v0.151.0 |
| Custom Tools — Define and use custom tools | — | ✓ since rust-v0.147.0 |
IDE Integrations
VS Code, JetBrains, and other editor support
| Feature | Grok | Codex CLI |
|---|---|---|
| VS Code — Visual Studio Code integration | — | ✓ since rust-v0.136.0 |
| JetBrains — IntelliJ/WebStorm integration | — | — |
| Vim/Neovim — Vim or Neovim integration | — | ✓ since rust-v0.150.0 |
| Web UI — Browser-based interface | — | ✓ since rust-v0.151.0 |
Agentic Features
Planning, tool use, and autonomous capabilities
| Feature | Grok | Codex CLI |
|---|---|---|
| Planning Mode — Plan before executing changes | — | ✓ since rust-v0.151.0 |
| Autonomous Mode — Extended autonomous operation | — | ✓ since rust-v0.150.1 |
| Task Decomposition — Break complex tasks into steps | — | ✓ since rust-v0.150.0 |
| Context Management — Manage context across conversations | — | ✓ since rust-v0.151.0 |
Feature timeline: who shipped first
First release where Grok and Codex CLI each shipped a notable feature, and which tool led.
| Feature | Grok | Codex CLI | Who led |
|---|---|---|---|
| Custom Slash Commands | — | August 20, 2025 | only Codex CLI |
| Subagents / Parallel Agents | — | January 25, 2026 | only Codex CLI |
| MCP Support | — | July 23, 2025 | only Codex CLI |
| Sandboxing / Permission Modes | — | August 7, 2025 | only Codex CLI |
| Planning Mode | — | January 25, 2026 | only Codex CLI |
| Hooks | — | May 8, 2026 | only Codex CLI |
| Skills / Plugins | — | December 10, 2025 | only Codex CLI |
| Project Memory Files | — | February 12, 2026 | only Codex CLI |
| Extended Thinking | — | July 9, 2025 | only Codex CLI |
| Voice Input | — | February 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 |
| Git / PR Integration | — | May 7, 2026 | only Codex CLI |
| Checkpoints / Rewind | — | December 15, 2025 | only Codex CLI |
| Todo / Task List | — | May 21, 2026 | only Codex CLI |
Release velocity
Havoptic tracks 118 Grok releases and 150 Codex CLI releases. See release frequency charts for side-by-side velocity analysis, or browse the Grok Build 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.