Model Details
About
DeepSeek-V3.1 is a large hybrid reasoning model (671B parameters, 37B active) that supports both thinking and non-thinking modes via prompt templates. It extends the DeepSeek-V3 base with a two-phase long-context training process, reaching up to 128K tokens, and uses FP8 microscaling for efficient inference. Users can control the reasoning behaviour with the `reasoning` `enabled` boolean. [Learn more in our docs](https://openrouter.ai/docs/use-cases/reasoning-tokens#enable-reasoning-with-default
Use via API
curl https://api.free.ai/v1/chat/ \
-H "Authorization: Bearer YOUR_KEY" \
-d '{"model":"deepseek/deepseek-chat-v3.1"}'
FAQ
DeepSeek: DeepSeek V3.1 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! DeepSeek: DeepSeek V3.1 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.
DeepSeek: DeepSeek V3.1 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 DeepSeek: DeepSeek V3.1 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 DeepSeek: DeepSeek V3.1 is yours to use for personal and commercial purposes. Our AI models are all commercially licensed.
DeepSeek: DeepSeek V3.1 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.
DeepSeek: DeepSeek V3.1 uses best-in-class open-source AI models including Qwen 2.5, FLUX, Whisper, and more. We regularly update to the latest models.
Yes! DeepSeek: DeepSeek V3.1 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.