Claude Fable 5 Chat Completion

Call Claude Fable 5 through PixMind with documented request parameters and response fields.

Claude Fable 5 is available through the PixMind chat-completions API. Use the documented messages, thinking, and output_config fields to control the response.

Claude Fable 5 through PixMind's OpenAI-compatible chat completions endpoint.

Provider

Anthropic

Model ID

claude-fable-5

Endpoint

POST /api-platform/v1/chat/completions

Open model playground Create API key

Authentication

Base URL: https://aihub-admin.aimix.pro. Send Authorization: Bearer <PIXMIND_API_KEY> on both creation and polling requests, and Content-Type: application/json when submitting JSON. Keep your key in a server environment variable.

Model notes

Keep the API key on your server and use streaming when the client needs incremental output.
Claude 5 and 4.8 use adaptive thinking. Set output_config.effort to low, medium, high, xhigh, or max; reasoning_effort is accepted as an OpenAI-compatible alias.
Changing thinking or effort starts a new prompt-cache prefix.

Request parameters

Parameter	Type	Required	Description
`model`	string	Yes	Stable PixMind model ID. Use `claude-fable-5`. Allowed values: `claude-fable-5`
`messages`	array	Yes	OpenAI-compatible chat messages. Gemini user content may be a string or an array of text, image_url, and video_url blocks.
`max_tokens`	integer	No	Maximum completion tokens; send a positive integer. The default and upper limit depend on the selected model. Playground default: `4096`
`thinking`	object	No	Claude thinking mode. Use {"type":"adaptive"}. Default: `{"type":"adaptive"}`
`output_config`	object	No	Thinking depth, for example {"effort":"high"}. Default: `{"effort":"high"}`
`stream`	boolean	No	Return tokens incrementally when enabled. Allowed values: `true`, `false` Default: `false`

Request example

cURL

curl --request POST 'https://aihub-admin.aimix.pro/api-platform/v1/chat/completions' \
  -H "Authorization: Bearer $PIXMIND_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "claude-fable-5",
  "messages": [
    {
      "role": "user",
      "content": "Draft three launch concepts for this product."
    }
  ],
  "thinking": {
    "type": "adaptive"
  },
  "output_config": {
    "effort": "high"
  },
  "stream": false
}'

JavaScript

// Node.js 20+. Keep the API key on your server.
const apiKey = process.env.PIXMIND_API_KEY;
if (!apiKey) throw new Error("PIXMIND_API_KEY is required");

const response = await fetch("https://aihub-admin.aimix.pro/api-platform/v1/chat/completions", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${apiKey}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
  "model": "claude-fable-5",
  "messages": [
    {
      "role": "user",
      "content": "Draft three launch concepts for this product."
    }
  ],
  "thinking": {
    "type": "adaptive"
  },
  "output_config": {
    "effort": "high"
  },
  "stream": false
}),
  signal: AbortSignal.timeout(30_000)
});

const task = await response.json();
if (!response.ok) {
  throw new Error(task.message ?? task.error?.message ?? `HTTP ${response.status}`);
}
console.log(task);

Response example

Non-streaming chat completions return choices directly. With stream: true, consume the SSE stream instead.

200 OK

{
  "id": "chatcmpl_example",
  "object": "chat.completion",
  "model": "claude-fable-5",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "Hello!"
      },
      "finish_reason": "stop"
    }
  ]
}