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Muse Spark Open

Meta · Released Oct 15, 2026 · 10 days ago · Open weights

Muse Spark Open is an 816B total / 42B active open-weight multimodal reasoning model from Meta for coding and long-horizon agentic work, with 1M-token context.

Strongest at
Science
Top 37% of the past year's models · one benchmark so far
Price per 1M tokens
$1.25 / $4.25
input / output · OpenRouter
Context window
1.05M
tokens in · 131.1K out
Open in the timeline

Capability profile

Scored against 90 models released in the past year. 50 is the average model; further out is better.

This modelMedian of the past year
5090Median of the past yearMath: 60 · Top 39%Science: 66 · Top 37%Computer use: 61 · Better than 33%MathScienceComputer use
Math60Top 39%
Science66Top 37% · 1 test
Computer use61Better than 33% · 1 test

No results yet: Coding, Writing, Reading & documents, Reasoning, Visual reasoning

Where these scores come from

Each capability combines the published benchmarks listed here, rescaled so 50 is the reference average and 15 points is one standard deviation. A hollow dot rests on a single benchmark.

Price against capability

The shaded corner holds anything better and cheaper. Prices blend input and output 3 to 1.

5 models from the past year score higher on Science for less: Gemini 3.8 Flash, DeepSeek V4.1 Flash 1017, GPT-6 Luna and 2 more.

$0.1$0.3$1$3$10$30406080100DeepSeek V4.1 Flash 1017: 69, $0.26 per 1MClaude Haiku 5.5: 65, $0.2 per 1MMistral Large 4: 65, $2.06 per 1MGemini 4 Argon: 71, $4 per 1MGPT-6.1 Sol: 70, $4 per 1MClaude Sonnet 5.5: 76, $4 per 1MGPT-6 Sol: 69, $4 per 1MGPT-6 Luna: 67, $0.2 per 1MClaude Opus 5.5: 108, $8 per 1MGrok 4.7: 61, $3 per 1MDeepSeek V4.1 Flash: 62, $0.27 per 1MGPT-6 Astra: 101, $20 per 1MGemini 3.8 Flash: 70, $1.5 per 1MClaude Fable 5.1: 90, $20 per 1MGLM-5.3-Flash: 67, $0.24 per 1MGLM-5.3: 60, $2.15 per 1MGemini 3.7 Flash: 54, $1.5 per 1MDeepSeek V4 Pro 0813: 66, $0.99 per 1MQwen3.8 2.4T A95B: 70, $3 per 1MGrok 4.6: 58, $3 per 1MMuse Spark 1.2: 60, $2 per 1MQwen3.8 Max: 68, $3 per 1MDeepSeek V4 Flash 0731: 64, $0.067 per 1MClaude Opus 5: 79, $10 per 1MGemini 3.6 Flash: 63, $1.5 per 1MGemini 3.5 Flash Lite: 53, $0.85 per 1MKimi K3: 62, $6 per 1MQwen3.7 Flash: 62, $0.055 per 1MGPT-5.6 Terra: 61, $4.5 per 1MGPT-5.6 Sol: 73, $8 per 1MGPT-5.6 Luna: 54, $0.45 per 1MGrok 4.5: 59, $3 per 1MClaude Sonnet 5: 66, $4 per 1MGLM-5.2: 67, $2.15 per 1MKimi K2.7 Code: 60, $1.71 per 1MClaude Fable 5: 71, $20 per 1MQwen3.7 Plus: 65, $0.7 per 1MClaude Opus 4.8: 63, $10 per 1MQwen3.7 Max: 67, $3.75 per 1MGemini 3.5 Flash: 65, $3.38 per 1MGPT-5.5 Instant: 62, $11.2 per 1MDeepSeek V4 Pro: 51, $0.26 per 1MDeepSeek V4 Flash: 49, $0.11 per 1MGPT-5.5 Pro: 69, $67.5 per 1MGPT-5.5: 73, $11.2 per 1MQwen3.6 27B: 64, $1.35 per 1MKimi K2.6: 62, $1.71 per 1MGrok 4.3: 52, $1.56 per 1MClaude Opus 4.7: 70, $10 per 1MQwen3.6 35B-A3B: 52, $0.84 per 1MGLM-5.1: 62, $2.15 per 1MGemma 4 31B IT: 57, $0.25 per 1MGPT-5.4 nano: 56, $0.46 per 1MGPT-5.4 mini: 62, $1.69 per 1MNemotron 3 Super 120B A12B: 44, $0.82 per 1MGPT-5.4 Pro: 75, $67.5 per 1MGPT-5.4: 71, $5.62 per 1MGemini 3.1 Flash Lite Preview: 54, $0.56 per 1MGemini 3.1 Flash Lite: 50, $0.56 per 1MQwen3.5 Flash: 62, $0.18 per 1MQwen3.5 9B: 59, $0.19 per 1MQwen3.5 35B-A3B: 62, $0.69 per 1MQwen3.5 27B: 45, $0.82 per 1MGemini 3.1 Pro Preview: 73, $4.5 per 1MClaude Sonnet 4.6: 63, $6 per 1MQwen3.5 Plus: 63, $0.9 per 1MQwen3.5 397B-A17B: 64, $1.35 per 1MGLM-5: 58, $1.55 per 1MGPT-5.3 Codex: 72, $4.81 per 1MClaude Opus 4.6: 69, $10 per 1MQwen3 Coder Next: 42, $0.29 per 1MKimi K2.5: 53, $1 per 1MGLM-4.7: 62, $1 per 1MGemini 3 Flash Preview: 63, $1.12 per 1MGPT-5.2: 66, $4.81 per 1MDeepSeek V3.2: 62, $0.32 per 1MClaude Opus 4.5: 60, $10 per 1MGPT-5.1: 61, $3.44 per 1MKimi K2 Thinking: 47, $1.07 per 1MMuse Spark Open: 66, $2 per 1MMuse Spark OpenPrice per 1M tokens →↑ Science$0.1$1$10406080100DeepSeek V4.1 Flash 1017: 69, $0.26 per 1MClaude Haiku 5.5: 65, $0.2 per 1MMistral Large 4: 65, $2.06 per 1MGemini 4 Argon: 71, $4 per 1MGPT-6.1 Sol: 70, $4 per 1MClaude Sonnet 5.5: 76, $4 per 1MGPT-6 Sol: 69, $4 per 1MGPT-6 Luna: 67, $0.2 per 1MClaude Opus 5.5: 108, $8 per 1MGrok 4.7: 61, $3 per 1MDeepSeek V4.1 Flash: 62, $0.27 per 1MGPT-6 Astra: 101, $20 per 1MGemini 3.8 Flash: 70, $1.5 per 1MClaude Fable 5.1: 90, $20 per 1MGLM-5.3-Flash: 67, $0.24 per 1MGLM-5.3: 60, $2.15 per 1MGemini 3.7 Flash: 54, $1.5 per 1MDeepSeek V4 Pro 0813: 66, $0.99 per 1MQwen3.8 2.4T A95B: 70, $3 per 1MGrok 4.6: 58, $3 per 1MMuse Spark 1.2: 60, $2 per 1MQwen3.8 Max: 68, $3 per 1MDeepSeek V4 Flash 0731: 64, $0.067 per 1MClaude Opus 5: 79, $10 per 1MGemini 3.6 Flash: 63, $1.5 per 1MGemini 3.5 Flash Lite: 53, $0.85 per 1MKimi K3: 62, $6 per 1MQwen3.7 Flash: 62, $0.055 per 1MGPT-5.6 Terra: 61, $4.5 per 1MGPT-5.6 Sol: 73, $8 per 1MGPT-5.6 Luna: 54, $0.45 per 1MGrok 4.5: 59, $3 per 1MClaude Sonnet 5: 66, $4 per 1MGLM-5.2: 67, $2.15 per 1MKimi K2.7 Code: 60, $1.71 per 1MClaude Fable 5: 71, $20 per 1MQwen3.7 Plus: 65, $0.7 per 1MClaude Opus 4.8: 63, $10 per 1MQwen3.7 Max: 67, $3.75 per 1MGemini 3.5 Flash: 65, $3.38 per 1MGPT-5.5 Instant: 62, $11.2 per 1MDeepSeek V4 Pro: 51, $0.26 per 1MDeepSeek V4 Flash: 49, $0.11 per 1MGPT-5.5 Pro: 69, $67.5 per 1MGPT-5.5: 73, $11.2 per 1MQwen3.6 27B: 64, $1.35 per 1MKimi K2.6: 62, $1.71 per 1MGrok 4.3: 52, $1.56 per 1MClaude Opus 4.7: 70, $10 per 1MQwen3.6 35B-A3B: 52, $0.84 per 1MGLM-5.1: 62, $2.15 per 1MGemma 4 31B IT: 57, $0.25 per 1MGPT-5.4 nano: 56, $0.46 per 1MGPT-5.4 mini: 62, $1.69 per 1MNemotron 3 Super 120B A12B: 44, $0.82 per 1MGPT-5.4 Pro: 75, $67.5 per 1MGPT-5.4: 71, $5.62 per 1MGemini 3.1 Flash Lite Preview: 54, $0.56 per 1MGemini 3.1 Flash Lite: 50, $0.56 per 1MQwen3.5 Flash: 62, $0.18 per 1MQwen3.5 9B: 59, $0.19 per 1MQwen3.5 35B-A3B: 62, $0.69 per 1MQwen3.5 27B: 45, $0.82 per 1MGemini 3.1 Pro Preview: 73, $4.5 per 1MClaude Sonnet 4.6: 63, $6 per 1MQwen3.5 Plus: 63, $0.9 per 1MQwen3.5 397B-A17B: 64, $1.35 per 1MGLM-5: 58, $1.55 per 1MGPT-5.3 Codex: 72, $4.81 per 1MClaude Opus 4.6: 69, $10 per 1MQwen3 Coder Next: 42, $0.29 per 1MKimi K2.5: 53, $1 per 1MGLM-4.7: 62, $1 per 1MGemini 3 Flash Preview: 63, $1.12 per 1MGPT-5.2: 66, $4.81 per 1MDeepSeek V3.2: 62, $0.32 per 1MClaude Opus 4.5: 60, $10 per 1MGPT-5.1: 61, $3.44 per 1MKimi K2 Thinking: 47, $1.07 per 1MMuse Spark Open: 66, $2 per 1MMuse Spark OpenPrice per 1M tokens →↑ Science

OpenRouter $1.25 / $4.25 · Cached input $0.15

ECI STANDING#36 of 270
SCORE155.11152.66–157.97 CI
FRONTIER LAGLaunched 10.1 months behindScores about what GPT-5.2 Pro did in December 2025.
SCORES LIKE THESE MODELS
Gemini 3.1 ProGoogle DeepMind · Feb 2026155.34
Qwen3.8 Max (0902)Alibaba · Sep 2026155.08
Muse Spark 1.2Meta AI · Aug 2026155.05Gemini 3.5 FlashGoogle DeepMind · May 2026154.88
Full Epoch Capabilities Index ranking ↗

Epoch benchmark boards

Best result on each board it has run. The tick marks the leader.

OTIS Mock AIME 2024-2025
98%#28 of 215
GPQA diamond
89%#51 of 233
SimpleQA Verified
57%#19 of 84
FrontierMath-Tiers-1-3-v2-Private
70%#28 of 89
FrontierMath-Tier-4-v2-Private
32%#31 of 71
APEX-Agents
33%#44 of 51

Meta's past year

8 release days in the past year, about one every 46 days. The next is expected around Dec 13, 2026. Forecasts ↗

NovDecJanFebMarAprMayJunJulAugSepOctNovDec

Specifications

RELEASE DATEOct 15, 2026
WEIGHTSOpen weights
CONTEXT WINDOW1.05M
MAX OUTPUT131.1K
REASONINGNot listed
TOOL CALLINGNot listed
INPUTStext, image, video, audio/wav, audio/mpeg
OUTPUTStext

Models.dev record ↗

Specifications and prices from Models.dev; availability and limits may differ by provider. Benchmarks from Epoch AI (CC BY 4.0), LiveBench and the other sources named above.