These tools competes with

Gemini CLIvsOpenAI Codex CLI

Google's open-source terminal AI agent versus OpenAI's open-source terminal agent for autonomous coding tasks

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Choose Gemini CLI when…

  • •You want a free terminal AI agent with a 1M token context window
  • •You're already using Gemini and want CLI-level access
  • •You want an OSS Claude Code alternative backed by Google

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

Side-by-side comparison

Field
Gemini CLI
OpenAI Codex CLI
Category
Coding Assistants
Coding Assistants
Type
Open Source
Open Source
Free Tier
✓ Yes
✗ No
Pricing Plans
Free: Free (Gemini API limits)
Pay-as-you-go: OpenAI API tokens
GitHub Stars
⭐ 50,000
⭐ 28,000
Health
●80 — Active
●90 — Active

Gemini CLI

Google's open-source terminal coding agent powered by Gemini 2.5 Pro. Features a 1M token context window, native MCP server support, and is free to use within Gemini API limits. A direct Claude Code and Aider competitor from Google.

Website ↗GitHub ↗

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 ↗

Shared Connections2 tools both integrate with

Claude CodeAider

Only Gemini CLI (2)

OpenAI Codex CLIGoogle Gemini API

Only OpenAI Codex CLI (2)

WarpGemini CLI

Explore the full AI landscape

See how Gemini CLI and OpenAI Codex CLI fit into the bigger picture — 235 tools, 543 relationships, all mapped.

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