Claude Sonnet 4 — Free AI Chat on Rewind.ai
Chat with Claude Sonnet 4 for free — no signup, no credit card. Anthropic's Claude Sonnet 4 runs in your browser on Rewind.ai, with pay-as-you-go tokens and full API access.
What is Claude Sonnet 4?
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%),.
How does Claude Sonnet 4 work?
Type your message in the box above and Claude Sonnet 4 replies instantly — no setup required. Your chat history is saved locally in your browser; sign up free to sync it across devices and get an extra 10,000 tokens. You can switch between Claude Sonnet 4 and other models at any time from the picker at the top.
Is Claude Sonnet 4 free?
Claude Sonnet 4 is a premium model: it runs on tokens from a token pack or paid plan (from $5). The free daily tokens (2,500 a day, 5,000 with a free account) cover Rewind's free models, so you can try the site at no cost.