Open Source Terminal AI Agent

Gemini CLI

Google's open-source command-line AI agent for coding, research, and task automation in the terminal.

Pricing: Open source, model usage may vary
Platforms: Terminal, macOS, Linux, Windows
Website: https://github.com/google-gemini/gemini-cli
Free access note: Gemini CLI is one of the strongest free-access candidates because Google documents generous individual quotas.
Caveat: Quotas, model routing, and account eligibility can change; check the current Gemini CLI docs.

2026 Positioning

Gemini CLI is worth comparing when you want an open-source terminal agent connected to Google’s Gemini ecosystem.

Best For

Developers who already use Gemini models.
Terminal-first users who want a broad command-line assistant.
Teams evaluating open-source agent foundations.

Watch Outs

The experience depends on model access, configuration, and how carefully the team controls command execution.