It’s also open source, OpenAI says. “ [Codex CLI is] a lightweight, open source coding agent that runs locally in your terminal,” an OpenAI spokesperson told TechCrunch via email.

Google launched a new, open source AI coding tool for terminals, Gemini CLI, to compete with similar offerings from OpenAI and Anthropic.

It's called Gemini CLI, and it shares a lot with Gemini Code Assist, but it works in your terminal environment instead of integrating with an IDE. And perhaps best of all, it's free and open source.

Also, Gemini CLI can work with other apps, not just Google's Gemini-based AI tools. It supports MCP, so developers can plug it into all sorts of tools that also support the interconnectivity protocol.

Gemini CLI is available “free-of-charge” with a personal Google Account and free Gemini Code Assist license. This gives you access to Gemini 2.5 Pro and its 1 million token context window.

Gemini CLI can be used for tasks ranging from content generation and problem-solving to task management and deep research. The capabilities of the multimodal reasoning model include code ...