Muse Spark Open vs Qwen3.8 Flash
Updated October 21, 2026. 7 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.
Decision reading
Pick Qwen3.8 Flash for coding: it scores 87.4 on the Vibe Coding Index against 62.1 for Muse Spark Open, though on 1 benchmark against 2.
Pick Muse Spark Open when the context window is larger, 1.05M against 1M tokens, or when the benchmark that matters is LiveBench research, where it leads.
- Shared results
- 7
- Muse Spark Open only
- 19
- Qwen3.8 Flash only
- 0
- Like-for-like categories
- 5 of 9
Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.
Which one for your work
Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.
Coding
Vibe Coding Index, four public coding benchmarks
Qwen3.8 Flash
Qwen3.8 Flash scores 87.4 against 62.1.
2 and 1 benchmarks behind the scores
Web design
Design Arena: websites
No call
Only Muse Spark Open has a Design Arena: websites result, 1311.
Directional only
Long documents
Listed context window
Muse Spark Open
Muse Spark Open takes 1.05M tokens against 1M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Qwen3.8 Flash
Muse Spark Open $0.0034, Qwen3.8 Flash $0.0004 per turn.
List prices
At a glance
- Coding index
- Muse Spark Open 62.1 from 2 benchmarks, Qwen3.8 Flash 87.4 from 1 benchmark.
- Widest category
- General, 14.0 points apart on average over 1 shared benchmark.
- Widest single gap
- LiveBench long agentic: Muse Spark Open 18.9% against Qwen3.8 Flash 37.1%, 18.2 points apart on a 0 to 100 scale.
- Output price
- Muse Spark Open $4.25 against Qwen3.8 Flash $0.47 per million output tokens, 9.0x apart.
- Context window
- Muse Spark Open takes 1.05M tokens, Qwen3.8 Flash 1M.
Benchmark by benchmark
First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.
| Category | Muse Spark Open | Bars | Qwen3.8 Flash | Ties |
|---|---|---|---|---|
| Coding | 0 | 1 | ||
| Agentic work | 1 | 2 | ||
| Reasoning | 0 | 1 | ||
| Web design | 0 | 1 | ||
| General | 0 | 1 | ||
| All shared boards | 1 | 6 |
CodingLike-for-likeFour of these boards feed the Vibe Coding Index01
| Benchmark | Muse Spark Open | Qwen3.8 Flash | Leader |
|---|---|---|---|
| LiveBench coding | 73.6% | 87.4% | Qwen3.8 Flash |
| LMArena WebDev | 1528 | Not measured | Only Muse Spark Open measured |
| Terminal-Bench 4 (Vals AI) | 6.6% | Not measured | Only Muse Spark Open measured |
| Vibe Code Bench (Vals AI) | 76.2% | Not measured | Only Muse Spark Open measured |
| Code migration (Vals AI) | 21.2% | Not measured | Only Muse Spark Open measured |
| SciCode | 58.4% | Not measured | Only Muse Spark Open measured |
| ALE-Bench | 1590.1 | Not measured | Only Muse Spark Open measured |
| LMArena WebDev: React | 1529 | Not measured | Only Muse Spark Open measured |
| LMArena WebDev: HTML | 1495 | Not measured | Only Muse Spark Open measured |
| Neither model has a result on the other 29 boards here | |||
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index1 board, none shared
| Benchmark | Muse Spark Open | Qwen3.8 Flash | Leader |
|---|---|---|---|
| Epoch Capabilities Index | 155.1 | Not measured | Only Muse Spark Open measured |
| Neither model has a result on the other 1 board here | |||
Agentic workLike-for-likePublic boards, shown as published, kept out of the index12
| Benchmark | Muse Spark Open | Qwen3.8 Flash | Leader |
|---|---|---|---|
| LiveBench research | 80.3% | 74.6% | Muse Spark Open |
| LiveBench browser | 36.0% | 48.0% | Qwen3.8 Flash |
| LiveBench long agentic | 18.9% | 37.1% | Qwen3.8 Flash |
| Finance Agent (Vals AI) | 61.3% | Not measured | Only Muse Spark Open measured |
| Tax Agent Bench (Vals AI) | 26.3% | Not measured | Only Muse Spark Open measured |
| Legal Research Bench (Vals AI) | 38.5% | Not measured | Only Muse Spark Open measured |
| Excel Modeling Benchmark (Vals AI) | 53.7% | Not measured | Only Muse Spark Open measured |
| APEX-Agents | 33.4% | Not measured | Only Muse Spark Open measured |
| Neither model has a result on the other 31 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | Muse Spark Open | Qwen3.8 Flash | Leader |
|---|---|---|---|
| LiveBench reasoning | 73.7% | 87.4% | Qwen3.8 Flash |
| GPQA Diamond (Artificial Analysis run) | 89.0% | Not measured | Only Muse Spark Open measured |
| Humanity's Last Exam (Artificial Analysis run) | 43.9% | Not measured | Only Muse Spark Open measured |
| Neither model has a result on the other 18 boards here | |||
MathNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Muse Spark Open | Qwen3.8 Flash | Leader |
|---|---|---|---|
| Neither model has a result on 13 boards here | |||
KnowledgeNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Muse Spark Open | Qwen3.8 Flash | Leader |
|---|---|---|---|
| Neither model has a result on 17 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | Muse Spark Open | Qwen3.8 Flash | Leader |
|---|---|---|---|
| Design Arena: websites | 1311 | Not measured | Only Muse Spark Open measured |
| Design Arena: game dev | 1290 | Not measured | Only Muse Spark Open measured |
| LiveBench design | 60.3% | 72.8% | Qwen3.8 Flash |
| Neither model has a result on the other 6 boards here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | Muse Spark Open | Qwen3.8 Flash | Leader |
|---|---|---|---|
| LiveBench data analysis | 60.2% | 74.2% | Qwen3.8 Flash |
| Long context reasoning (AA-LCR) | 78.3% | Not measured | Only Muse Spark Open measured |
| Neither model has a result on the other 44 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Muse Spark Open | Qwen3.8 Flash | Leader |
|---|---|---|---|
| Neither model has a result on 5 boards here | |||
What each workload costs
Three fixed token mixes at each model's listed price, so per-token rates become a bill.
Chat turn
1K input + 500 output tokens
Qwen3.8 Flash costs less
Repository review
50K input + 3K output tokens
Qwen3.8 Flash costs less
Agent loop
200K input + 10K output tokens
Qwen3.8 Flash costs less
Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.
Specification differences
The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.
| Specification | Meta Muse Spark Open | Qwen3.8 Flash |
|---|---|---|
| Maker | Meta | Qwen |
| Weights | Open weights | Open weights |
| Released | October 15, 2026 | August 26, 2026 |
| Context window | 1.05M | 1M |
| Input $/Mtok | $1.25 | $0.15 |
| Output $/Mtok | $4.25 | $0.47 |
| Coding index | 62.1 | 87.4 |
| Independent measurements behind it | 2 | 1 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Muse Spark Open better than Qwen3.8 Flash for coding?
Pick Qwen3.8 Flash for coding: it scores 87.4 on the Vibe Coding Index against 62.1 for Muse Spark Open, though on 1 benchmark against 2. Pick Muse Spark Open when the context window is larger, 1.05M against 1M tokens, or when the benchmark that matters is LiveBench research, where it leads.
Which is cheaper, Muse Spark Open or Qwen3.8 Flash?
Muse Spark Open costs $1.25 per million input tokens and $4.25 per million output tokens; Qwen3.8 Flash costs $0.15 and $0.47. Cost per solved task is known for neither of them.
Which has the bigger context window, Muse Spark Open or Qwen3.8 Flash?
Muse Spark Open, with 1.05M tokens against 1M.
How many benchmarks is the Muse Spark Open vs Qwen3.8 Flash comparison based on?
7 benchmarks have a result for both models as of October 21, 2026. Muse Spark Open's coding index rests on 2 independent benchmarks and Qwen3.8 Flash's on 1. Where only one model has a result, the page says so instead of naming a winner.