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Head-to-head · AI Coding Assistants

Gemini CLI vs OpenAI Codex

  • Updated Oct 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score Gemini CLI #4 in AI Coding Assistants 9.0/10 Free plan Free plan✓ 4 of 5 features Visit Gemini CLI
OpenAI Codex #5 in AI Coding Assistants 8.9/10 Paid ✓ 4 of 5 features Visit OpenAI Codex

Gemini CLI leads on 1 check, OpenAI Codex on 0, and 4 are even. Who comes out ahead on the 5 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreGemini CLI · 9.0/10
  • Free planonly Gemini CLI

Gemini CLI scores higher on our rubric for ai coding assistants: 9.0 against 8.9 out of 10; our editors rank them #4 and #5.

Gemini CLI offers free plan; OpenAI Codex doesn't.

Gemini CLI is the better fit for free terminal-first coding assistance. OpenAI Codex is the better fit for teams delegating complete engineering tasks.

  • Gemini CLI fits best

    Free terminal-first coding assistance

  • OpenAI Codex fits best

    Teams delegating complete engineering tasks

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Side by side

Feature Gemini CLI 9.0/10 Visit ↗ OpenAI Codex 8.9/10 Visit ↗
At a glance
Editor score 9.0 8.9
Ranking #4 in AI Coding Assistants #5 in AI Coding Assistants
Best for Free terminal-first coding assistance Teams delegating complete engineering tasks
Pricing model Free plan + paid Paid
Starting price — —
Free plan ✓ (best) —
Free trial — —
Deployment Self-hosted Cloud, Desktop
Platforms Windows, macOS, Linux Web, Windows, macOS, Linux
Support Docs Docs · 24/7
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features Gemini CLI 4/5 · OpenAI Codex 4/5
Code completion Not checked yet Not checked yet
Chat assistance ✓ ✓
Coding agent ✓ ✓
Codebase indexing ✓ ✓
Terminal access ✓ ✓
Specs
Supported IDEs Antigravity, Visual Studio Code, JetBrains, Zed Visual Studio Code; Cursor; Windsurf; Visual Studio Code Insiders; Xcode; JetBrains IDEs
Our review
Pros
  • Free terminal access with natural-language coding and debugging
  • Multi-file editing, shell commands, testing, agents, and subagents
  • MCP, headless scripting, checkpoints, and IDE integrations
  • Handles features, refactors, migrations, reviews, and code changes
  • Supports terminal use, cloud delegation, and parallel worktrees
  • Works with VS Code, Cursor, Windsurf, Xcode, and JetBrains IDEs
Cons
  • Terminal-first workflows may not suit inline-completion needs
  • Usage limits vary across Google access paths
  • Enterprise controls are tied to Vertex AI access
  • No free plan
  • Paid access is offered through ChatGPT plans and related surfaces
  • IDE coverage is centered on the listed integrations
Our verdict

Gemini CLI is an open-source, terminal-first AI coding agent for developers working across Windows, macOS, and Linux. It can generate and debug code, explore codebases, read and edit files, run shell commands and tests, automate multi-step…

Read the review →

OpenAI Codex is an AI coding agent for software developers and engineering teams. It works through ChatGPT, supported IDEs, and the terminal, helping with complete engineering tasks such as building features, refactoring code, migrating…

Read the review →
  1. Gemini CLIAI Coding Assistants 9.0Free plan
  2. OpenAI CodexAI Coding Assistants 8.9Paid

Strengths and trade-offs

  • Gemini CLI — where it wins

    • Free terminal access with natural-language coding and debugging
    • Multi-file editing, shell commands, testing, agents, and subagents
    • MCP, headless scripting, checkpoints, and IDE integrations

    Where it doesn't

    • Terminal-first workflows may not suit inline-completion needs
    • Usage limits vary across Google access paths
    • Enterprise controls are tied to Vertex AI access

  • OpenAI Codex — where it wins

    • Handles features, refactors, migrations, reviews, and code changes
    • Supports terminal use, cloud delegation, and parallel worktrees
    • Works with VS Code, Cursor, Windsurf, Xcode, and JetBrains IDEs

    Where it doesn't

    • No free plan
    • Paid access is offered through ChatGPT plans and related surfaces
    • IDE coverage is centered on the listed integrations

More comparisons

All AI coding assistants comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update