Muse Spark 1.3

Why teams choose it

Tradeoffs to know

• Weights are not open; the announced Muse Spark open-weight release is still a roadmap item, not this checkpoint.
• Max reasoning is Standard-tier only. Muse Code docs still default to muse-spark-1.2 until you change the model.
• Contributor-tier data-use terms are not the Standard privacy path.

When not to use this

• Not ideal for simple tasks where cheaper models in the same lineup are good enough.
• Avoid for regulated or high-stakes outputs without evaluations that mimic your tooling, data, and review process.
• Pair catalog notes with comparisons and your own benchmarks before declaring a routing winner.

Technical specs

Inputs

text, image, video, PDF

Outputs

text

Capabilities

coding, long-horizon agents, tool calling, reasoning, planning, multitasking, structured outputs, search grounding, image understanding, video understanding

License

Proprietary API

Model string

muse-spark-1-3

Benchmarks

{
  "api_id": "muse-spark-1.3",
  "source": "https://research.meta.ai/blog/introducing-muse-spark-1-3",
  "context_tokens": 1048576,
  "vendor_reported": true
}