Qwen3.8 27B

Qwen3.8 27B is an open-weight dense vision-language model from Qwen, suited for coding, professional workflows, research, multimodal interaction and long-running agent tasks, with flexible thinking that can be turned up or down. Qwen Open-Weight Vision-Language 27B, with a 1M token context window.

POST/v1/ai/chat

$0.01/call

Overview

Property	Value
Model ID	`qwen/qwen3.8-27b`
Context Window	1,000,000 tokens
Max Output	131,072 tokens
Input Price	$0.62 / 1M tokens
Output Price	$4.43 / 1M tokens

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: 'qwen/qwen3.8-27b',
    messages: [{ role: 'user', content: 'Explain this architecture diagram and point out the single points of failure.' }],
  }),
});
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": "qwen/qwen3.8-27b", "messages": [{"role": "user", "content": "Explain this architecture diagram and point out the single points of failure."}]}'

Request Body

Parameter	Type	Required	Description	Default
`model`	`string`	Yes	Model ID (e.g. `qwen/qwen3.8-27b`)	—
`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.

Response

{
  "ok": true,
  "data": {
    "model": "qwen/qwen3.8-27b",
    "message": {
      "role": "assistant",
      "content": "Traffic enters through one load balancer into two app servers that share one Postgres primary with no replica and one Redis node. The load balancer, the database and Redis are each single points of failure; the app tier is not."
    },
    "usage": {
      "promptTokens": 16,
      "completionTokens": 245,
      "totalTokens": 261
    }
  }
}

Streaming

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

data: {"delta":{"content":"Use"},"model":"qwen/qwen3.8-27b","index":0}
data: [DONE]

Under the Hood

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