Glimmer Index
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Muse Spark Open

Meta · Released Oct 15, 2026 · 13 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
Reading & documents
Top 28% 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 91 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 yearReading & documents: 61 · Top 28%Math: 60 · Top 40%Science: 66 · Top 38%Visual reasoning: 58 · Top 44%Computer use: 61 · Better than 33%ReadingMathScienceVisionComputer use
Reading & documents61Top 28% · 1 test
Math60Top 40%
Science66Top 38% · 1 test
Visual reasoning58Top 44% · 1 test
Computer use61Better than 33% · 1 test

No results yet: Coding, Writing, 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.

3 models from the past year score higher on Reading & documents for less: Gemini 3 Flash Preview, Qwen3.5 9B, DeepSeek V4 Pro 0813.

$0.1$0.3$1$3$10204060GPT-6.1 Terra: 64, $2 per 1MClaude Haiku 5.5: 39, $0.2 per 1MMistral Large 4: 29, $2.06 per 1MGemini 4 Argon: 71, $4 per 1MGPT-6.1 Sol: 73, $4 per 1MClaude Sonnet 5.5: 67, $4 per 1MGPT-6 Sol: 62, $4 per 1MGPT-6 Luna: 50, $0.2 per 1MClaude Opus 5.5: 68, $8 per 1MGrok 4.7: 56, $3 per 1MDeepSeek V4.1 Flash: 60, $0.21 per 1MGPT-6 Astra: 72, $20 per 1MMuse Spark 1.3: 63, $2 per 1MGemini 3.8 Flash: 55, $1.5 per 1MClaude Fable 5.1: 71, $20 per 1MQwen3.8 Flash: 46, $0.23 per 1MGLM-5.3-Flash: 50, $0.24 per 1MDeepSeek V4 Flash Vision Exp: 33, $0.32 per 1MQwen3.8 27B: 45, $1.12 per 1MGLM-5.3: 47, $2.15 per 1MGemini 3.7 Flash: 60, $1.5 per 1MDeepSeek V4 Pro 0813: 63, $0.99 per 1MGrok 4.6: 53, $3 per 1MMuse Glimmer 30B: 47, $0.52 per 1MMuse Spark 1.2: 54, $2 per 1MQwen3.8 Max: 59, $3 per 1MDeepSeek V4 Flash 0731: 59, $0.15 per 1MClaude Opus 5: 63, $10 per 1MGemini 3.6 Flash: 50, $1.5 per 1MGemini 3.5 Flash Lite: 34, $0.85 per 1MKimi K3: 58, $6 per 1MQwen3.7 Flash: 22, $0.055 per 1MGPT-5.6 Terra: 50, $4.5 per 1MGPT-5.6 Sol: 65, $8 per 1MGPT-5.6 Luna: 44, $0.45 per 1MGrok 4.5: 49, $3 per 1MClaude Sonnet 5: 51, $4 per 1MGLM-5.2: 47, $2.15 per 1MKimi K2.7 Code: 34, $1.71 per 1MClaude Fable 5: 73, $20 per 1MQwen3.7 Plus: 38, $0.7 per 1MClaude Opus 4.8: 55, $10 per 1MQwen3.7 Max: 49, $3.75 per 1MGemini 3.5 Flash: 56, $3.38 per 1MDeepSeek V4 Pro: 51, $1.19 per 1MDeepSeek V4 Flash: 31, $0.18 per 1MGPT-5.5: 64, $11.2 per 1MQwen3.6 27B: 30, $1.35 per 1MKimi K2.6: 36, $1.71 per 1MGrok 4.3: 25, $1.56 per 1MGrok Build 0.1: 38, $1.25 per 1MClaude Opus 4.7: 56, $10 per 1MMuse Spark 1.1: 50, $2 per 1MQwen3.6 Plus: 40, $1.12 per 1MGLM-5V-Turbo: 39, $1.9 per 1MGPT-5.4 nano: 36, $0.46 per 1MGPT-5.4 mini: 40, $1.69 per 1MGPT-5.4: 63, $5.62 per 1MQwen3.5 9B: 64, $0.19 per 1MQwen3.5 27B: 26, $0.82 per 1MGemini 3.1 Pro Preview: 69, $4.5 per 1MClaude Sonnet 4.6: 52, $6 per 1MClaude Opus 4.6: 51, $10 per 1MGemini 3 Flash Preview: 65, $1.12 per 1MGPT-5.2 Codex: 50, $4.81 per 1MMistral Large 3: 20, $0.75 per 1MMuse Spark Open: 61, $2 per 1MMuse Spark OpenPrice per 1M tokens →↑ Reading & documents$0.1$1$10204060GPT-6.1 Terra: 64, $2 per 1MClaude Haiku 5.5: 39, $0.2 per 1MMistral Large 4: 29, $2.06 per 1MGemini 4 Argon: 71, $4 per 1MGPT-6.1 Sol: 73, $4 per 1MClaude Sonnet 5.5: 67, $4 per 1MGPT-6 Sol: 62, $4 per 1MGPT-6 Luna: 50, $0.2 per 1MClaude Opus 5.5: 68, $8 per 1MGrok 4.7: 56, $3 per 1MDeepSeek V4.1 Flash: 60, $0.21 per 1MGPT-6 Astra: 72, $20 per 1MMuse Spark 1.3: 63, $2 per 1MGemini 3.8 Flash: 55, $1.5 per 1MClaude Fable 5.1: 71, $20 per 1MQwen3.8 Flash: 46, $0.23 per 1MGLM-5.3-Flash: 50, $0.24 per 1MDeepSeek V4 Flash Vision Exp: 33, $0.32 per 1MQwen3.8 27B: 45, $1.12 per 1MGLM-5.3: 47, $2.15 per 1MGemini 3.7 Flash: 60, $1.5 per 1MDeepSeek V4 Pro 0813: 63, $0.99 per 1MGrok 4.6: 53, $3 per 1MMuse Glimmer 30B: 47, $0.52 per 1MMuse Spark 1.2: 54, $2 per 1MQwen3.8 Max: 59, $3 per 1MDeepSeek V4 Flash 0731: 59, $0.15 per 1MClaude Opus 5: 63, $10 per 1MGemini 3.6 Flash: 50, $1.5 per 1MGemini 3.5 Flash Lite: 34, $0.85 per 1MKimi K3: 58, $6 per 1MQwen3.7 Flash: 22, $0.055 per 1MGPT-5.6 Terra: 50, $4.5 per 1MGPT-5.6 Sol: 65, $8 per 1MGPT-5.6 Luna: 44, $0.45 per 1MGrok 4.5: 49, $3 per 1MClaude Sonnet 5: 51, $4 per 1MGLM-5.2: 47, $2.15 per 1MKimi K2.7 Code: 34, $1.71 per 1MClaude Fable 5: 73, $20 per 1MQwen3.7 Plus: 38, $0.7 per 1MClaude Opus 4.8: 55, $10 per 1MQwen3.7 Max: 49, $3.75 per 1MGemini 3.5 Flash: 56, $3.38 per 1MDeepSeek V4 Pro: 51, $1.19 per 1MDeepSeek V4 Flash: 31, $0.18 per 1MGPT-5.5: 64, $11.2 per 1MQwen3.6 27B: 30, $1.35 per 1MKimi K2.6: 36, $1.71 per 1MGrok 4.3: 25, $1.56 per 1MGrok Build 0.1: 38, $1.25 per 1MClaude Opus 4.7: 56, $10 per 1MMuse Spark 1.1: 50, $2 per 1MQwen3.6 Plus: 40, $1.12 per 1MGLM-5V-Turbo: 39, $1.9 per 1MGPT-5.4 nano: 36, $0.46 per 1MGPT-5.4 mini: 40, $1.69 per 1MGPT-5.4: 63, $5.62 per 1MQwen3.5 9B: 64, $0.19 per 1MQwen3.5 27B: 26, $0.82 per 1MGemini 3.1 Pro Preview: 69, $4.5 per 1MClaude Sonnet 4.6: 52, $6 per 1MClaude Opus 4.6: 51, $10 per 1MGemini 3 Flash Preview: 65, $1.12 per 1MGPT-5.2 Codex: 50, $4.81 per 1MMistral Large 3: 20, $0.75 per 1MMuse Spark Open: 61, $2 per 1MMuse Spark OpenPrice per 1M tokens →↑ Reading & documents

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%#29 of 216
GPQA diamond
89%#52 of 234
SimpleQA Verified
57%#20 of 85
FrontierMath-Tiers-1-3-v2-Private
70%#29 of 90
FrontierMath-Tier-4-v2-Private
32%#32 of 72
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 15, 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.