As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/m/muse-spark-1-3/

# Muse Spark 1.3

Meta, Muse family. Status: current. Type: reasoning model. Released: 2026-09-02. Training cutoff: not published.

## How to call it

| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| Meta Model API | `muse-spark-1.3` | https://api.meta.ai/v1/chat/completions | https://dev.meta.ai/docs/ |
| OpenRouter | `meta/muse-spark-1.3` |  | https://openrouter.ai/meta/muse-spark-1.3 |
| Web app |  |  | https://meta.ai |

## Pricing

- Input: $1.25 per 1M tokens
- Cached input: $0.15 per 1M tokens
- Output: $4.25 per 1M tokens
- Unit as published: per 1M tokens (USD), standard tier; "contributor" tier muse-spark-1.3-contributor is $0.10/$0.002 cached/$0.20
- Source: https://dev.meta.ai/models/muse-spark/
- Last checked: 2026-09-29

## Specs

- Input: text, image, video, pdf
- Output: text
- Context window: 1,000,000 tokens
- Max output: 200,000 tokens
- Open weights: no
- Licence: proprietary

## What it has not seen

- No published training cutoff. Counted from its release (2026-09-02): at least 1,592 AI events since (353 major, 71 historic), as of 2026-11-13.
- Everything since August 2026: https://postcutoff.com/since/2026-08/

## What stands out

- Closed-weights successor to Llama: Proprietary model from Meta Superintelligence Labs; Muse Spark replaced Llama in Meta AI in April 2026. Source: https://venturebeat.com/technology/goodbye-llama-meta-launches-new-proprietary-ai-model-muse-spark-first-since
- Native video + document perception: Natively multimodal input (video, images, documents, text) with 1M context and 200K max output. Source: https://dev.meta.ai/models/muse-spark/
- Long-horizon multi-agent tuning: 1.3 tuned for long-running, multi-agent agentic builds; also powers Meta's Muse Code. Source: https://x.com/MetaforDevs/status/2095232442953236714
- Contributor pricing tier: Separate -contributor model ids priced ~90% lower (data-sharing tier). Source: https://dev.meta.ai/docs/

## Notes

Other ids: muse-spark-1.2, muse-spark-1.1, muse-spark-1.3-contributor, muse-spark-1.2-contributor. OpenAI-SDK-compatible API (public preview, self-serve). Contributor tier data terms not verified. Knowledge cutoff not published.

Meta's current flagship (closed) for agentic coding and multimodal (video/doc) understanding.

```bash
curl https://api.meta.ai/v1/chat/completions -H "Authorization: Bearer $MODEL_API_KEY" -H "Content-Type: application/json" \
 -d '{"model":"muse-spark-1.3","messages":[{"role":"user","content":"Hello"}]}'
```

Sources: https://dev.meta.ai/models/muse-spark/ , https://dev.meta.ai/docs/ , https://research.meta.ai/blog/introducing-muse-spark-1-3

Model page: https://postcutoff.com/m/muse-spark-1-3/