Fly143/deepseek-free-api

What it solves

This project provides a proxy that converts the free web-based chat interface of DeepSeek (chat.deepseek.com) into a standard OpenAI-compatible API. This allows users to integrate DeepSeek's free models into third-party LLM clients (like ChatBox or LobeChat) without needing an official paid API key.

How it works

The proxy is built with FastAPI and uses curl_cffi to simulate Chrome TLS fingerprints, avoiding the need for heavy browser automation. It handles the complex requirements of the DeepSeek web API, including:

• PoW (Proof of Work) Solving: Automatically solves challenges using a Node.js WASM solver or a Python fallback to authorize requests.
• Token Management: Automatically refreshes session tokens using stored credentials when a 401 error is detected.
• Dynamic Model Discovery: Periodically probes the official API to update the list of available models and their capabilities (e.g., reasoning, search).
• Protocol Translation: Maps OpenAI-style requests to DeepSeek's internal API and converts responses (including reasoning tags) back into OpenAI-compatible formats.

Who it’s for

• Developers and AI enthusiasts who want to use DeepSeek's free web models via an API.
• Users of third-party LLM interfaces who prefer the DeepSeek ecosystem but lack API access.
• Those looking for a lightweight alternative to browser-automation-based proxies.

Highlights

• Broad API Compatibility: Supports OpenAI /v1/chat/completions, the new OpenAI Responses API, and the Anthropic Messages API.
• Multimodal Support: Handles image uploads for Vision models and text file uploads for standard models.
• Automated Account Management: Includes a web-based admin panel for login and a bulk account registration system to mitigate the risk of account bans.
• Deep Reasoning Integration: Specifically handles <thought> tags, separating reasoning content from the final answer in streaming responses.
• Tool Use Emulation: Implements tool calling via DSML prompt injection and multiple extraction strategies since the web API does not natively support function calling.