The DeepSeek API uses an API format compatible with OpenAI/Anthropic. By modifying the configuration, you can use the OpenAI/Anthropic SDK or softwares compatible with the OpenAI/Anthropic API to access the DeepSeek API. (1) Use deepseek-flash as the model name. The legacy names deepseek-v4-flash and deepseek-v4-flash-vision-exp are still accepted, but the corresponding models have been retired, their requests are served by the DeepSeek-V4.1-Flash model and billed at the Flash price. Integrate with Agent Tools ​ DeepSeek Harness is now in developer preview for agent harness developers worldwide. See the DeepSeek Harness Guide for details. The DeepSeek API is supported by many popular AI agent and coding assistant tools. If you use tools like Claude Code, GitHub Copilot, or OpenCode, you can use DeepSeek as the backend model directly — no code required. See the Agent Integrations Guide for details.

Invoke The Chat API ​ Once you have obtained an API key, you can access the DeepSeek model using the following example scripts in the OpenAI API format. This is a non-stream example, you can set the stream parameter to true to get stream response. For examples using the Anthropic API format, please refer to Anthropic API . Integrate with Agent Tools Invoke The Chat API