HAI Gateway Docs

DeepSeek

DeepSeek Anthropic Messages

Call DeepSeek models via the Anthropic Messages compatible endpoint, supporting streaming, thinking, and tool calling.

POSTv1/messages

Authorizations

x-api-keystringheaderrequired

sk-pat-YourAccessToken

anthropic-versionstringheaderrequired

API version, currently 2023-06-01

Use your HAI Gateway personal access token (starting with sk-pat-). No separate DeepSeek API key is required.

Base URL

https://api.hai.network/compatible-preview/anthropic

Body Parameters

The request body follows the Anthropic Messages API format. For detailed parameter descriptions, refer to the DeepSeek Anthropic Compatible documentation.

DeepSeek Notes
  • Only Chat Completion endpoints are supported: DeepSeek does not support the OpenAI Responses (/v1/responses) endpoint. Please use /v1/chat/completions or Anthropic /v1/messages.
  • Thinking is only available on pro: enable_thinking (OpenAI endpoint) or thinking (Anthropic endpoint) only works with deepseek-v4-pro; deepseek-v4-flash ignores these parameters and does not return thinking content.
  • Thinking field location: On the OpenAI endpoint, the reasoning chain is in the choices[].message.reasoning_content field; on the Anthropic endpoint, it appears as a thinking block in the content array.
  • Do not pass reasoning in multi-turn context: When building conversation history, only pass back the previous turn's content (OpenAI) or text block (Anthropic) — do not include reasoning_content / thinking blocks in messages, otherwise a parameter error will be returned.
  • developer role not supported: The OpenAI compatible endpoint only accepts system / user / assistant roles; the Anthropic endpoint follows the official user / assistant conversation structure, with system messages passed via the top-level system field.
cURL
cURL:Streaming
curl https://api.hai.network/compatible-preview/anthropic/v1/messages \
  -H "Content-Type: application/json" \
  -H "x-api-key: sk-pat-YOUR_ACCESS_TOKEN" \
  -H "anthropic-version: 2023-06-01" \
  -d '{
    "model": "deepseek-v4-flash",
    "stream": true,
    "max_tokens": 1024,
    "messages": [
      {
        "role": "user",
        "content": "Describe Hangzhou in one sentence"
      }
    ]
  }'