Muse Spark 1.3
MetaReleased Sep 2, 2026Closed weightsmuse-spark-1.3
- Intelligence (Epoch)
- 157 · 18th of 111
- Reasoning
- yes, with effort levels
- Context
- 1M tokens
- Input
- text, image, video, audio, pdf
- API features
- tools, structured outputs, JSON mode
- Meta's API
- yes
Read Oct 23, 06:00 UTC from the hosts' published offers and OpenRouter, spec sheet from Meta
Intelligence for the price
2 models score higher for the same price or less; it ranks 3 of the 80 models at its price or below.
Epoch Capabilities Index against the lowest input + output price per M, log scale · prices Oct 23. Score: Epoch AI, CC BY 4.0, 157 with an interval of 155 to 160.
Against its rivals
The best of its price range and the top score
- Muse Spark 1.3this model$5.50157
- Claude Opus 5.5top score$24.00169
- Gemini 3.7 Flashsame price range$4.50158
- Gemini 3.8 Flashsame price range$4.50157
Same level for 29× less: GLM-5.3-Flash at StreamLake, $0.19 per M input + output · their Epoch intervals overlap (153 against 157).
Bars: Epoch Capabilities Index (Epoch AI, CC BY 4.0), drawn from 100, below the lowest score in the catalogue · price: lowest input + output per M.
| Provider | Input | Output | Cache ↑ | tok/s | First token | Uptime 24h | Checked |
|---|---|---|---|---|---|---|---|
| Meta | $1.25 | $4.25 | $0.15 | 207 | 1.92 s | 99.8% | Oct 23 |
1 provider · prices per million tokens, read Oct 23, 06:00 UTC · speed: OpenRouter, median of the last 30 min, read Oct 23, 06:00 UTC · uptime: OpenRouter, last 24 h
| Provider | Weights | Context | Max output | Tools | Structured outputs | Reasoning |
|---|---|---|---|---|---|---|
| Meta | — | 1M | — | yes | yes | yes |
As served by each host and declared to OpenRouter; not verified by us · weights: the precision the host declares
Muse Spark 1.3 spec sheet, field by field, with sources
Muse Spark 1.3 spec sheetmaker-declared
What Meta declares about the model itself — read from its own weights repository and documentation, not from any host. What each endpoint actually serves is in the pricing above: the two can differ, and both are true.
- Context window
- 1,048,576 tokens
- Parameters
- not published by the maker
- Active experts
- not published by the maker
- Weight precision
- not applicable — no weights publishedcurated
- License
- Proprietary — API onlycuratedScope: the licence on the published weights, and nothing else. It is not the maker's acceptable-use policy, which is a separate document, and it is not the contract you sign with whichever host you call — hosts set their own terms, which this index does not read.
- Knowledge cutoff
- not published by the maker
- Modalities
- text · image · video · audio · PDF → text
- Max output (official)
- not published by the maker
- Release date
- September 2, 2026maker's docs · read 2026-10-12
- Maker lifecycle status
- Latest Muse Spark version, recommended for new work
dev.meta.ai · maker's documentation · read 2026-10-12 · 5 of 10 fields published by the maker
| Provider | Chatbot 1,000 in / 500 out | RAG / long context 8,000 in / 500 out | Batch summarize 4,000 in / 1,000 out |
|---|---|---|---|
| Meta | $3.38 | $12.12 | $9.25 |
What each host bills for 1,000 requests of a representative job
Your own workload
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