DeepSeek R1

DeepSeek's reasoning-specialized model. Chain-of-thought reasoning for complex math, logic, and coding problems.

POST/v1/ai/chat

$0.01/call

Overview

DeepSeek's reasoning-specialized model. Uses chain-of-thought to solve complex math, logic, and coding problems.

Property	Value
Model ID	`deepseek/deepseek-r1`
Context Window	128,000 tokens
Max Output	8,192 tokens
Input Price	$0.55 / 1M tokens
Output Price	$2.19 / 1M tokens
Type	Reasoning model

Usage

const res = await fetch('https://api.yepapi.com/v1/ai/chat', {
  method: 'POST',
  headers: {
    'x-api-key': 'YOUR_API_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    model: 'deepseek/deepseek-r1',
    messages: [{ role: 'user', content: 'A farmer has 3 chickens and 2 cows. He buys 2 more chickens and sells 1 cow. How many legs are on his farm?' }],
  }),
});
const { data } = await res.json();
console.log(data.message.content);

curl -X POST https://api.yepapi.com/v1/ai/chat \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "deepseek/deepseek-r1", "messages": [{"role": "user", "content": "A farmer has 3 chickens and 2 cows. He buys 2 more chickens and sells 1 cow. How many legs are on his farm?"}]}'

Request Body

Parameter	Type	Required	Description	Default
`model`	`string`	Yes	Model ID (e.g. `deepseek/deepseek-r1`)	—
`messages`	`Message[]`	Yes	Array of `{ role, content }` objects	—
`maxTokens`	`number`	No	Maximum tokens in the response	Model default
`temperature`	`number`	No	Sampling temperature (0.0–2.0)	`1.0`
`topP`	`number`	No	Nucleus sampling threshold	`1.0`
`frequencyPenalty`	`number`	No	Penalize repeated tokens	`0`
`presencePenalty`	`number`	No	Penalize tokens already present	`0`
`stream`	`boolean`	No	Enable SSE streaming	`false`

Info

All AI models use the /v1/ai/chat endpoint. Specify the model with the model field. DeepSeek R1 is a reasoning model — it may produce longer responses with step-by-step thinking.

Response

{
  "ok": true,
  "data": {
    "model": "deepseek/deepseek-r1",
    "message": {
      "role": "assistant",
      "content": "Let me work through this step by step:\n\n1. Start: 3 chickens (2 legs each) + 2 cows (4 legs each) = 6 + 8 = 14 legs\n2. Buys 2 chickens: 5 chickens + 2 cows = 10 + 8 = 18 legs\n3. Sells 1 cow: 5 chickens + 1 cow = 10 + 4 = 14 legs\n\nThe farmer has 14 legs on his farm."
    },
    "usage": {
      "promptTokens": 30,
      "completionTokens": 95,
      "totalTokens": 125
    }
  }
}

Streaming

Set "stream": true to receive Server-Sent Events. Each chunk contains a delta object:

data: {"delta":{"content":"Let me"},"model":"deepseek/deepseek-r1","index":0}
data: [DONE]

Under the Hood

We handle auth, billing, and response normalization — you just send messages.