GPT_API_free: Complete Guide to Free GPT-4, DeepSeek, and Other LLM API Calls

Project Overview: A Free LLM API Solution with 37K Stars

AI application development inevitably faces a practical problem — API call costs. LLM API pricing is typically based on a token billing mechanism. A token is the smallest unit of text processed by a model, relying on tokenizer algorithms under the hood. Modern LLMs generally use BPE (Byte Pair Encoding) or WordPiece algorithms, which compress text into token sequences of roughly 100,000 vocabulary items by identifying statistically frequent character combinations. In English, each word corresponds to approximately 1-2 tokens, while in Chinese, each character corresponds to roughly 1.5-2 tokens. This difference stems from the character structure of logographic writing systems, meaning Chinese content of equivalent information density typically costs more in API calls than English content. Taking GPT-4 Turbo as an example, the input price is about $10 per million tokens, and the output price is about $30. A single medium-length conversation can consume thousands of tokens, and costs accumulate rapidly with frequent usage.

For developers who need to repeatedly debug prompts or run batch tests, monthly API bills easily exceeding hundreds of dollars is not uncommon. API pricing for DeepSeek^Ad, Claude, and other models is similarly expensive for individual developers and small teams. So, is there a way to experience the capabilities of these mainstream LLMs at zero cost?

The open-source project chatanywhere/GPT_API_free on GitHub was created to solve exactly this problem. It provides free ChatGPT and DeepSeek API Keys, allowing developers to call multiple mainstream LLMs without spending a single cent.

As of now, the project has earned 37,725 Stars and 2,627 Forks, making it one of the most popular open-source projects in the free LLM API space.

Which LLMs Does GPT_API_free Support? Complete Model List

Multi-Model Aggregation: One Key to Call All Mainstream LLMs

GPT_API_free is not just a "free ChatGPT relay"