Muse Spark 1.3
Summary
Muse Spark 1.3 is a proprietary language model from Meta, released on 2 Sept 2026. It accepts text, images, video, PDFs and audio and generates text, with a 1M-token context window and up to 131K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $1.25 per million input tokens and $4.25 per million output tokens (OpenRouter), across 2 providers we track.
Muse Spark 1.3 is a multimodal reasoning model from Meta for long-running agentic, multi-agent, and coding workflows. It improves long-horizon agent collaboration, instruction following, and coding efficiency relative to Muse Spark 1.2.
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | Meta |
|---|---|
| Release date | 2 Sept 2026 [models.dev] |
| Status | Generally available [models.dev] |
| Weights | Proprietary (API only) [models.dev] |
| Context window | 1M (1,048,576 tokens) [models.dev] |
| Max output | 131K tokens [models.dev] |
| Input | Text, images, video, PDFs and audio [models.dev] |
| Output | Text [models.dev] |
| Reasoning mode | Yes [models.dev] |
| Tool calling | Yes [models.dev] |
| Structured output | Yes [models.dev] |
Muse Spark 1.3 API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| OpenRouter meta/muse-spark-1.3 | $1.25 | $4.25 | $0.15 | 1M | OpenRouter, 4 Oct 2026 |
| Vercel AI Gateway meta/muse-spark-1.3 | $1.25 | $4.25 | $0.15 | 1M | models.dev, 4 Oct 2026 |
Frequently asked questions
What is the context window of Muse Spark 1.3?
Muse Spark 1.3 has a context window of 1,048,576 tokens (1M) and can generate up to 131,072 tokens in a single response, according to models.dev.
How much does the Muse Spark 1.3 API cost?
Muse Spark 1.3 is listed from $1.25 per million input tokens and $4.25 per million output tokens (OpenRouter). Prices last verified 4 Oct 2026.
Is Muse Spark 1.3 open source?
No. Muse Spark 1.3 is a proprietary model; Meta has not released its weights. It is available through APIs including OpenRouter, Vercel AI Gateway.
When was Muse Spark 1.3 released?
Meta released Muse Spark 1.3 on 2 Sept 2026, according to models.dev.
Which providers offer Muse Spark 1.3?
We track Muse Spark 1.3 on 2 providers: OpenRouter, Vercel AI Gateway.
Change history
No changes detected since we started tracking this model. We re-check every source daily.