DeepSeek Models | API Docs

DeepSeek models use the Common Chat Completions endpoint. To switch models, change only the model value; the endpoint and authentication stay the same.

text

POST https://api.requestbeam.com/v1/chat-completions

Available Models

`model` value	Positioning	Non-streaming	SSE streaming
`deepseek-v4-flash`	Flash tier and a practical starting point for routine chat or batch evaluations	Yes	Yes
`deepseek-v4-pro`	Pro tier for evaluations that prioritize complex reasoning and output quality	Yes	Yes
`deepseek-v4.1-flash`	DeepSeek V4.1 Flash; a distinct model ID, not a V4 Flash alias	After deployment and enablement	After deployment and enablement

V4.1 Flash becomes available only after its routing configuration is deployed and enabled. Use it only when GET https://api.requestbeam.com/v1/models returns deepseek-v4.1-flash for your API Key. This reference entry does not confirm a production rollout or a successful inference test. Existing V4 Flash and V4 Pro IDs remain unchanged.

This positioning helps you choose an initial model to test; it is not a latency, throughput, or quality SLA. Compare available models with your own prompts, output lengths, and concurrency before production use.

Authentication

http

Authorization: Bearer YOUR_API_KEY
Content-Type: application/json

Non-streaming Request

The endpoint returns one complete Chat Completions response by default. The example includes stream: false explicitly so its behavior remains obvious when copied.

json

{
  "model": "deepseek-v4-flash",
  "messages": [
    {
      "role": "system",
      "content": "You are a precise technical assistant."
    },
    {
      "role": "user",
      "content": "Explain three benefits of event-driven architecture."
    }
  ],
  "stream": false
}

To use the Pro model, change only the model field:

json

{
  "model": "deepseek-v4-pro"
}

Streaming Request

Set stream: true explicitly for streaming and process the response as SSE events until [DONE].

json

{
  "model": "deepseek-v4-pro",
  "messages": [
    {
      "role": "user",
      "content": "Create a checklist for a reversible database migration."
    }
  ],
  "stream": true
}

Request Fields

modelstringrequired

Use deepseek-v4-flash, deepseek-v4-pro, or deepseek-v4.1-flash, as returned by GET https://api.requestbeam.com/v1/models.

messagesobject[]required

OpenAI Chat Completions style messages. Each message contains role and content.

streambooleanDefault: false

true returns SSE; false returns one complete JSON response.

max_tokensinteger

Optional maximum output tokens, as a positive integer. Omit this field to use the upstream default for the selected model. Depending on the model, the budget may include reasoning tokens as well as final text. A small budget can truncate the answer or be exhausted before final text; increasing it may increase cost.

max_completion_tokensinteger

Optional compatibility alternative to max_tokens, with the same budget considerations. The selected model determines support; omit both fields to use the upstream default.

See Common Chat Completions for shared fields such as temperature, top_p, frequency_penalty, presence_penalty, stop, and n. Support and semantic effects may vary by model; this guide does not establish V4.1 Flash support for every optional field.

Success Response

json

{
  "id": "chatcmpl_...",
  "object": "chat.completion",
  "created": 1787200000,
  "model": "deepseek-v4-flash",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "1. Services can remain loosely coupled..."
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 31,
    "completion_tokens": 96,
    "total_tokens": 127
  }
}

Responses may contain additional usage details; treat them as optional.

Usage Notes

The current public contract is Chat Completions, including non-streaming and SSE streaming.
These models are not currently available through OpenAI Responses or Claude Messages.
Set the request body's model field to the exact ID: deepseek-v4-flash, deepseek-v4-pro, or deepseek-v4.1-flash.
Use only model IDs returned by GET https://api.requestbeam.com/v1/models.
Use GET https://api.requestbeam.com/v1/models for the models visible to the current API Key, and use the console for current pricing.