Model Details
About
Claude Sonnet 4 significantly enhances the capabilities of its predecessor, Sonnet 3.7, excelling in both coding and reasoning tasks with improved precision and controllability. Achieving state-of-the-art performance on SWE-bench (72.7%), Sonnet 4 balances capability and computational efficiency, making it suitable for a broad range of applications from routine coding tasks to complex software development projects. Key enhancements include improved autonomous …
Use via API
curl https://api.free.ai/v1/chat/ \
-H "Authorization: Bearer YOUR_KEY" \
-d '{"model":"anthropic/claude-sonnet-4"}'
FAQ
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Anthropic: Claude Sonnet 4 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.
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Anthropic: Claude Sonnet 4 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 uses best-in-class open-source AI models including Qwen 2.5, FLUX, Whisper, and more. We regularly update to the latest models.
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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.