Model Details
About
Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with improvements across system design, code security, and specification adherence. The model is designed for extended autonomous operation, maintaining task continuity across sessions and providing fact-based progress tracking. Sonnet 4.5 also …
Use via API
curl https://api.free.ai/v1/chat/ \
-H "Authorization: Bearer YOUR_KEY" \
-d '{"model":"anthropic/claude-sonnet-4.5"}'
FAQ
Anthropic: Claude Sonnet 4.5 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! Anthropic: Claude Sonnet 4.5 is completely free to use with generous daily limits. Sign up for a free account to get even more usage, or upgrade for unlimited access.
Anthropic: Claude Sonnet 4.5 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 Sonnet 4.5 immediately without signing up. Creating a free account gives you 3x more daily usage and saves your history.
Anonymous users get a generous daily allowance that resets every 24 hours. Signed-in users get 3x more. Paid plans offer unlimited usage.
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 Sonnet 4.5 is yours to use for personal and commercial purposes. Our AI models are all commercially licensed.
Anthropic: Claude Sonnet 4.5 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 Sonnet 4.5 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 Sonnet 4.5 works perfectly on mobile devices. Our responsive design adapts to any screen size.
Sign up for a free account to get 3x more daily usage. For unlimited access, check our affordable pricing plans starting at $5/month.
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.