Model Details
About
Claude Opus 4.1 is an updated version of Anthropic’s flagship model, offering improved performance in coding, reasoning, and agentic tasks. It achieves 74.5% on SWE-bench Verified and shows notable gains in multi-file code refactoring, debugging precision, and detail-oriented reasoning. The model supports extended thinking up to 64K tokens and is optimized for tasks involving research, data analysis, and tool-assisted reasoning.
Use via API
curl https://api.free.ai/v1/chat/ \
-H "Authorization: Bearer YOUR_KEY" \
-d '{"model":"anthropic/claude-opus-4.1"}'
FAQ
Anthropic: Claude Opus 4.1 on Free.ai is a powerful AI-powered tool that you can use completely free of charge. No sign up required to get started.
Yes! You get 10,000 free tokens per day to use Anthropic: Claude Opus 4.1 and all other tools. Sign up for a free account to get 50,000 tokens/day. Buy more starting at $1.
Anthropic: Claude Opus 4.1 uses state-of-the-art open-source AI models to deliver high-quality results. Your request is processed on our GPU servers and the result is returned in seconds.
No! You can use Anthropic: Claude Opus 4.1 immediately without signing up. Creating a free account gives you 3x more daily usage and saves your history.
Anonymous users get 10,000 tokens/day. Free accounts get 50,000 tokens/day. Tokens reset every 24 hours. Each tool costs ~100-5,000 tokens per use depending on the operation.
Your data is processed securely on our servers and is not stored permanently unless you choose to save it. We do not sell or share your data.
Yes! Content generated by Anthropic: Claude Opus 4.1 is yours to use for personal and commercial purposes. Our AI models are all commercially licensed.
Anthropic: Claude Opus 4.1 on Free.ai delivers comparable quality to paid services using the latest open-source AI models. We believe powerful AI should be accessible to everyone.
Anthropic: Claude Opus 4.1 uses best-in-class open-source AI models including Qwen 2.5, FLUX, Whisper, and more. We regularly update to the latest models.
Yes! Anthropic: Claude Opus 4.1 works perfectly on mobile devices. Our responsive design adapts to any screen size.
Sign up for a free account to get 50,000 tokens/day (5x more). Or buy token packs starting at $1 for 750,000 tokens. See /pricing/ for all options.
Yes! After generating content, you can download it, copy it, or share it via a unique link. Signed-in users can also view their generation history.