Muse Spark
Muse Spark is an API-only (closed weights) language model from Meta, released April 8, 2026. On the Epoch Capabilities Index it scores 153.1, rank 53 of 256 rated models.
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Lab
Meta
Released
April 8, 2026
Weights
API-only (closed weights)
Parameters
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Context
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Price / M tokens
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Epoch ECI
153.1 #53
Strengths by category
ModelTape's 0–100 fit on Epoch AI benchmark results.
| Category | Score | Based on |
|---|---|---|
| Math | 58.5 | ProofBench, OTIS Mock AIME 2024-2025, FrontierMath-2025-02-28-Private, FrontierMath-Tier-4-2025-07-01-Private |
Benchmark results
| Benchmark (Epoch AI) | Score |
|---|---|
| GPQA Diamond | 90.0% |
| OTIS Mock AIME | 88.9% |
| FrontierMath-2025-02-28-Private | 68.4% |
| Humanity's Last Exam | 40.6% |
| FrontierMath-Tier-4-2025-07-01-Private | 24.3% |
| ProofBench | 17.0% |
Links
Announcement · Epoch AI benchmarks
Models with a similar score
GLM-5.3 · Claude Sonnet 5 · DeepSeek V4.1 Flash · GPT-5.6 Luna · GPT-6 Luna · Claude Opus 4.6 · Grok 4.7 · Gemini 3.1 Pro
More from Meta
Muse Ember · Muse Spark Open · Muse Wonder · Muse Wonder Full · Muse Spark 1.3 · Muse Spark 1.3 Contributor · Muse Glimmer · Muse Glimmer 30B assistant