DeepSeek API supports DeepSeek-V4, old model names retire in three months

DeepSeek-V4

The DeepSeek API now supports V4-Pro and V4-Flash, compatible with the OpenAI ChatCompletions interface and the Anthropic interface. The base_url stays the same for the new models, but the model parameter must be set to deepseek-v4-pro or deepseek-v4-flash.

Why it matters: DeepSeek keeps the API address while changing the model parameter and sets a clear retirement date for old model names, so migration means adjusting call configuration.