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Step 5 Preview
Muse Spark 1.3
Muse Spark 1.3 is a proprietary model from Meta, released Sep 2, 2026. It ranks #10 of 351 on the LMArena text leaderboard with a rating of 1491. It costs $1.25 per million input tokens and $4.25 per million output tokens, with a 1M-token context window.
- Developer
- Meta
- Released
- Sep 2, 2026
- Context window
- 1M
- Price in / out, per 1M tokens
- $1.25 / $4.25
- Weights
- Proprietary
- Inputs
- Text, Images, Video, Files
- Reasoning
- Yes
- Tool use
- Yes
Benchmarks
| Benchmark | Score bar | Accuracy | Rank | Cost / test |
|---|---|---|---|---|
| Terminal-Bench 4.0Coding | 10.61% | 41 / 55 | $7.04 | |
| Vibe Code BenchCoding | 82.86% | 21 / 115 | $2.10 | |
| Tax Agent BenchFinance | 35.97% | 13 / 76 | $0.32 | |
| Legal Research BenchLaw | 40.87% | 29 / 85 | $0.65 | |
| Terminal-Bench ScienceReasoning | 4.29% | 25 / 42 | $4.41 |
Vals AI, as of Oct 24, 2026.
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| TextLMArena | 1491 | 10 / 351 | 20.5K |
| CodingLMArena | 1511 | 13 / 346 | 5.3K |
| MathLMArena | 1502 | 13 / 339 | 1K |
| Creative writingLMArena | 1462 | 23 / 349 | 4.6K |
| Instruction followingLMArena | 1479 | 21 / 351 | 7.3K |
| Hard promptsLMArena | 1504 | 13 / 351 | 13.3K |
| Multi-turnLMArena | 1489 | 16 / 349 | 3.1K |
| Long queriesLMArena | 1489 | 17 / 330 | 9.2K |
| ExpertLMArena | 1515 | 16 / 305 | 2.2K |
| Legal and governmentIndustries | 1499 | 12 / 325 | 1.7K |
| Medicine and healthcareIndustries | 1493 | 16 / 325 | 1.4K |
| Business and financeIndustries | 1489 | 9 / 344 | 3.7K |
| ChineseLanguages | 1529 | 24 / 328 | 1.6K |
| SpanishLanguages | 1493 | 11 / 249 | 672 |
| GermanLanguages | 1513 | 3 / 261 | 301 |
| FrenchLanguages | 1516 | 5 / 252 | 687 |
| JapaneseLanguages | 1465 | 23 / 236 | 350 |
| WebDevLMArena | 1657 | 16 / 124 | 9.9K |
| VisionLMArena | 1308 | 12 / 146 | 5.4K |
LMArena, CC BY 4.0, as of Oct 22, 2026. Where a model is rated at several effort levels, its best is shown (Muse Spark 1.3 (Max), Muse Spark 1.3 (xHigh)).
Compare Muse Spark 1.3
Meta
Meta’s AI research publishes the Llama family, among the most downloaded open-weight models. Founded 2013 (FAIR), based in Menlo Park. ai.meta.com
Questions
Who makes Muse Spark 1.3?
Muse Spark 1.3 is made by Meta, founded 2013 (FAIR) and based in Menlo Park.
How much does Muse Spark 1.3 cost?
$1.25 per million input tokens and $4.25 per million output tokens, at its provider’s list price.
What is Muse Spark 1.3’s context window?
1M tokens (1,048,576).
How does Muse Spark 1.3 rank?
#10 of 351 on LMArena’s text leaderboard, rated 1491 (95% interval 1486–1496) from 20,506 votes, as of Oct 22, 2026.
Is Muse Spark 1.3 open source?
No. Muse Spark 1.3 is proprietary and served through its provider’s API.