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 June 27, 2026.
At a glance
| Tool | Latest version | Release date | Releases tracked |
|---|---|---|---|
| Grok Build | — | — | 0 |
| OpenAI Codex CLI | rust-v0.142.4 | June 29, 2026 | 131 |
Core Editing
Multi-file editing, streaming, undo capabilities
| Feature | Grok | Codex CLI |
|---|---|---|
| Multi-file Editing — Edit multiple files in a single operation | — | ✓ (CLI operates on codebases with tool calls and code mode, implying multi-file editing capability across sessions) |
| Streaming Output — Real-time streaming of AI responses | — | ✓ since rust-v0.142.0 |
| Undo/Redo — Ability to undo and redo changes | — | ✓ since rust-v0.142.0 |
| Diff View — Visual comparison of changes | — | ✓ since rust-v0.142.3 |
Terminal Integration
Shell and command execution support
| Feature | Grok | Codex CLI |
|---|---|---|
| Command Execution — Run shell commands | — | ✓ since rust-v0.142.2 |
| Shell Integration — Integration with user shell environment | — | ✓ since rust-v0.137.0 |
| Background Tasks — Run tasks in background | — | ✓ since rust-v0.142.0 |
MCP Support
Model Context Protocol server and client capabilities
| Feature | Grok | Codex CLI |
|---|---|---|
| MCP Client — Connect to MCP servers | — | ✓ since rust-v0.142.2 |
| MCP Server — Expose as MCP server | — | ✓ since rust-v0.142.2 |
| Custom Tools — Define and use custom tools | — | ✓ since rust-v0.131.0 |
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-v0.136.0 |
| Web UI — Browser-based interface | — | ✓ since rust-v0.142.0 |
Agentic Features
Planning, tool use, and autonomous capabilities
| Feature | Grok | Codex CLI |
|---|---|---|
| Planning Mode — Plan before executing changes | — | ✓ since rust-v0.142.0 |
| Autonomous Mode — Extended autonomous operation | — | ✓ since rust-v0.142.0 |
| Task Decomposition — Break complex tasks into steps | — | ✓ since rust-v0.142.0 |
| Context Management — Manage context across conversations | — | ✓ since rust-v0.142.2 |
Release velocity
Havoptic tracks 0 Grok releases and 131 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.