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Muse Spark 1.3

Meta's latest Muse Spark version, tuned for agentic workflows (multi-step tool, browser, and long-horizon tasks) with improved coding.

Metamuse-spark-1.32026-09-02Report incorrect data

Specs

Context
1.05M
Max output
—
Input price
$1.25/ 1M tokens
Output price
$4.25/ 1M tokens
Released
2026-09-02

Context

Context window
1.05M
Max input
—
Max output
—

Pricing · USD / 1M tokens

Input
$1.25
Output
$4.25
Cache read
$0.15
Cache write
—

Modalities

Input
TextImageVideoAudioDocument
Output
Text

API

API types
chatresponses

Reasoning

Reasoning
Yes
Levels
minimallowmediumhighxhighmax

Info

Status
Active
Released
2026-09-02
Knowledge cutoff
—

Features

Confirmed
toolsstructured_outputstreamingcaching
Source · official docsVerified 2026-10-11

How to call

1 provider

metamodel = muse-spark-1.3reasoning = reasoning_effort

chat
POSThttps://api.meta.ai/v1/v1/chat/completions
responses
POSThttps://api.meta.ai/v1/v1/responses

JSON

Standard format
muse-spark-1.3.json
{
  "id": "muse-spark-1.3",
  "object": "model",
  "created": 1788307200,
  "owned_by": "meta",
  "name": "Muse Spark 1.3",
  "api": {
    "types": [
      "chat",
      "responses"
    ]
  },
  "limits": {
    "context": 1048576,
    "input": null,
    "output": null
  },
  "modalities": {
    "input": [
      "text",
      "image",
      "video",
      "audio",
      "document"
    ],
    "output": [
      "text"
    ]
  },
  "reasoning": {
    "supported": true,
    "efforts": [
      "minimal",
      "low",
      "medium",
      "high",
      "xhigh",
      "max"
    ]
  },
  "pricing": {
    "currency": "USD",
    "unit": "1M_tokens",
    "input": 1.25,
    "output": 4.25,
    "cache_read": 0.15,
    "cache_write": null
  },
  "features": [
    "tools",
    "structured_output",
    "streaming",
    "caching"
  ],
  "info": {
    "status": "active",
    "release_date": "2026-09-02",
    "knowledge_cutoff": null,
    "description": "Meta's latest Muse Spark version, tuned for agentic workflows (multi-step tool, browser, and long-horizon tasks) with improved coding.",
    "docs": "https://dev.meta.ai/docs/models",
    "verified_at": "2026-10-11"
  }
}

Official sources

6
Models | Meta Model APIdev.meta.ai2026-10-10Pricing and rate limits | Meta Model APIdev.meta.ai2026-10-10Reasoning | Meta Model APIdev.meta.ai2026-10-10Prompt caching | Meta Model APIdev.meta.ai2026-10-10Structured output | Meta Model APIdev.meta.ai2026-10-10Introducing Muse Spark 1.3 | Metaresearch.meta.ai2026-10-11