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.
Specification
most-agreed values
Context
1M
Max output
131K
Released
2026-10-15
Knowledge cutoff
2026-01-04
Retires
—
Open weights
yes
Input
text, image
Output
text
Price
US dollars per million tokens · most-agreed
Input
$1.25
Output
$4.25
Cache read
$1.25
Batch and priority prices
US dollars per million tokens · per listing
| Price | Listing | $/M |
|---|---|---|
| Priority input | fireworks_ai | $1.875 |
| Priority output | fireworks_ai | $6.375 |
Quality
5 benchmarks · 1 source
Composite
86th
percentile of 344 scored models
Rank
49 / 344
±0.06 sd
Evidence
5 × 1
one source, or fewer than 3 benchmarks
Effort range
—
one configuration only
reasoning92nd1/4 bench
math82nd3/7 bench
knowledge78th1/1 bench
Every score
one row per source and configuration — nothing averaged away
| Benchmark | Score | Configuration | Source | Run |
|---|---|---|---|---|
| OTIS Mock AIME 2024-2025 | 98.1 ±1.3 | xhigh | Epoch AI | 2026-10-15 |
| GPQA diamond | 88.6 ±1.9 | xhigh | Epoch AI | 2026-10-15 |
| FrontierMath-Tiers-1-3-v2 | 69.8 ±2.7 | xhigh | Epoch AI | 2026-10-15 |
| SimpleQA Verified | 56.6 ±1.6 | xhigh | Epoch AI | 2026-10-15 |
| FrontierMath-Tier-4-v2 | 31.7 ±7.4 | xhigh | Epoch AI | 2026-10-15 |
The leading figure for a benchmark is the median across its configurations, so one heroic high-effort run cannot set the number.
Available from 18 hosts
| Host | In $/M | Out $/M | Cache rd | Cache wr | Context | Output | Retires |
|---|---|---|---|---|---|---|---|
| aiand | $1.25 | $4.25 | $0.15 | — | 1M | 944K | — |
| aiand · aiand | $1.25 | $4.25 | $0.15 | — | 1M | 944K | — |
| baseten | $1.25 | $4.25 | $0.15 | — | 1M | 1M | — |
| cloudflare-ai-gateway | $1.25 | $4.25 | $0.15 | — | 1M | 131K | — |
| edenai | $1.25 | $4.25 | $1.25 $0.15 | — | 1M | 131K | — |
| fireworks_ai | $1.25 | $4.25 | $0.15 | — | 1M | — | — |
| fireworks-ai · accounts | $1.25 | $4.25 | $0.15 | — | 1M | 131K | — |
| kilo | $1.25 | $4.25 | $0.15 | — | 1M | 131K | — |
| merge-gateway | $1.25 | $4.25 | $0.15 | — | 1M | 262K | — |
| nano-gpt | $1.25 | $4.25 | $0.15 | — | 1M | 131K | — |
| nebius · meta-models | $1.25 | $4.25 | $0.15 | — | 1M | 1M | — |
| ollama-cloud | $1.25 | $4.25 | $0.15 | — | 1M | 131K | — |
| openrouter | $1.25 | $4.25 | $0.15 | — | 1M | 131K | — |
| prime | $1.25 | $4.25 | — | — | 1M | 131K | — |
| requesty | $1.25 | $4.25 | $0.15 | — | 1M | 131K | — |
| vercel | $1.25 | $4.25 | $0.15 | — | 1M | 1M | — |
| venice | $1.5625 | $5.3125 | $0.1875 | — | 1M | 131K | — |
| kyma · kyma | $1.688 | $5.738 | — | — | 1M | 944K | — |
Price history
append-only observations · a listing writes a row only when its price moves
| Date | Host | Field | $/M |
|---|---|---|---|
| 2026-10-16 | nebius · meta-models | Cache read | $1.25 |
| 2026-10-24 | nebius · meta-models | Cache read | $0.15 |
| 2026-10-17 | edenai | Cache read | $1.25 |
| 2026-10-20 | edenai | Cache read | $0.15 |
| 2026-10-22 | edenai | Cache read | $1.25 |
| 2026-10-24 | edenai | Cache read | $0.15 |
| 2026-10-25 | edenai | Cache read | $1.25 |
| 2026-10-27 | edenai | Cache read | $0.15 |
| 2026-10-28 | edenai | Cache read | $1.25 |
| 2026-10-31 | edenai | Cache read | $0.15 |
| 2026-11-01 | edenai | Cache read | $1.25 |
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