These tools competes with

OpenAI Codex CLIvsGrok Build

OpenAI's open-source terminal agent for autonomous coding tasks versus xAI's agentic coding CLI powered by Grok Code Fast

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Choose OpenAI Codex CLI when…

  • •using OpenAI models and want a terminal coding agent
  • •prefer open-source with full control over the agent loop
  • •need to integrate with existing OpenAI API infrastructure

Choose Grok Build when…

  • •You're already paying for SuperGrok and want an agentic coding CLI bundled in
  • •You want a Rust-native terminal agent that also works headlessly in CI
  • •You need Agent Client Protocol (ACP) support to embed the agent in your own editor

Side-by-side comparison

Field
OpenAI Codex CLI
Grok Build
Category
Coding Assistants
Coding Assistants
Type
Open Source
Commercial
Free Tier
✗ No
✗ No
Pricing Plans
Pay-as-you-go: OpenAI API tokens
SuperGrok: $30/moSuperGrok Heavy: $300/mo
GitHub Stars
⭐ 28,000
⭐ 22,300
Health
●85 — Active
●100 — Active

OpenAI Codex CLI

OpenAI Codex CLI is an open-source terminal agent that applies natural language instructions to your local codebase. Running in your terminal, it reads files, writes code, runs tests, and iterates until the task is complete — powered by OpenAI's o4-mini model.

Website ↗GitHub ↗

Grok Build

Terminal-based AI coding agent from xAI, built around the purpose-trained grok-code-fast-1 model. Runs as a full-screen TUI or headlessly for CI, edits files and runs shell commands autonomously, and exposes an Agent Client Protocol (ACP) for embedding in editors.

Website ↗GitHub ↗

Shared Connections1 tool both integrate with

Claude Code

Only OpenAI Codex CLI (4)

AiderWarpGemini CLIGrok Build

Only Grok Build (1)

OpenAI Codex CLI

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