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Step 5 Preview
Muse Spark 1.2
Muse Spark 1.2 is a proprietary model from Meta, released Aug 5, 2026. It ranks #17 of 351 on the LMArena text leaderboard with a rating of 1482. It costs $1.25 per million input tokens and $4.25 per million output tokens, with a 1M-token context window.
- Developer
- Meta
- Released
- Aug 5, 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
The rating LMArena published at each update since Aug 6, 2026. Ratings move as votes come in and new models join.
Benchmarks
| Benchmark | Score bar | Accuracy | Rank | Cost / test |
|---|---|---|---|---|
| Terminal-Bench 4.0Coding | 6.06% | 46 / 55 | $4.14 | |
| SWE-benchCoding | 86.60% | 14 / 85 | $0.55 | |
| Vibe Code BenchCoding | 79.10% | 27 / 115 | $1.53 | |
| Tax Agent BenchFinance | 32.80% | 17 / 76 | $0.27 | |
| Legal Research BenchLaw | 43.75% | 22 / 85 | $0.51 | |
| MedCodeMedicine | 49.35% | 24 / 107 | $1.25 / $4.25 | |
| MMLU-ProReasoning | 88.28% | 20 / 138 | $1.25 / $4.25 | |
| MMMUReasoning | 86.13% | 22 / 93 | $1.25 / $4.25 |
Vals AI, as of Oct 24, 2026.
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| TextLMArena | 1482 | 17 / 351 | 10.5K |
| CodingLMArena | 1505 | 18 / 346 | 2.7K |
| MathLMArena | 1483 | 31 / 339 | 547 |
| Creative writingLMArena | 1435 | 56 / 349 | 2.2K |
| Instruction followingLMArena | 1463 | 39 / 351 | 3.7K |
| Hard promptsLMArena | 1490 | 20 / 351 | 6.7K |
| Multi-turnLMArena | 1500 | 11 / 349 | 1.5K |
| Long queriesLMArena | 1473 | 41 / 330 | 4.6K |
| ExpertLMArena | 1474 | 57 / 305 | 1.1K |
| Legal and governmentIndustries | 1513 | 5 / 325 | 832 |
| Medicine and healthcareIndustries | 1495 | 14 / 325 | 714 |
| Business and financeIndustries | 1484 | 10 / 344 | 1.9K |
| ChineseLanguages | 1506 | 49 / 328 | 883 |
| SpanishLanguages | 1479 | 16 / 249 | 343 |
| FrenchLanguages | 1492 | 23 / 252 | 382 |
| WebDevLMArena | 1533 | 52 / 124 | 2.2K |
| VisionLMArena | 1304 | 17 / 146 | 1.9K |
LMArena, CC BY 4.0, as of Oct 22, 2026. Where a model is rated at several effort levels, its best is shown.
Compare Muse Spark 1.2
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 1.2?
Muse Spark 1.2 is made by Meta, founded 2013 (FAIR) and based in Menlo Park.
How much does Muse Spark 1.2 cost?
$1.25 per million input tokens and $4.25 per million output tokens, at its provider’s list price.
What is Muse Spark 1.2’s context window?
1M tokens (1,048,576).
How does Muse Spark 1.2 rank?
#17 of 351 on LMArena’s text leaderboard, rated 1482 (95% interval 1475–1489) from 10,470 votes, as of Oct 22, 2026.
Is Muse Spark 1.2 open source?
No. Muse Spark 1.2 is proprietary and served through its provider’s API.