Zero API is a free AI tool platform offering API access to various AI models. It provides endpoints compatible with OpenAI's API format, supporting models like GPT-4o. The platform emphasizes accessibility for education, accessibility services, and public welfare initiatives.
Key features include:
- Multiple model access through a unified API endpoint
- Compatibility with tools like roocode, kilocode, Claude Code, and Cherry Studio
- Free usage tier with rate limiting
- Support for custom API configurations
Rate limits vary by group: CC and Codex groups at 15 RPM, free group at 1 RPM, others at 6 RPM. The service is intended for personal learning and research only, with strict prohibitions against NSFW content, redistribution, or commercial use.
Primary use cases include AI-assisted programming, educational projects, and personal experimentation with AI technologies.

