Models / Muse Spark Open
Muse Spark Open
Early evidence, 9 results from 1 source, on 2 use cases. Muse Spark Open is best for reasoning and knowledge; it is not on sale through OpenRouter, so it is here for reference.
Results 20 Oct 2026 · 9 results · 1 source
- Price per million tokens
- Not available through OpenRouter
- Speed
- 142 tokens a second; on its test prompt the answer starts after 14.6 s, thinking time included
Artificial Analysis, on its usual API, at xhigh reasoning - Intelligence Index
- 38.9
Artificial Analysis, at xhigh reasoning - Spring Prompt overall
- Not ranked yet
needs our benchmarks and two groups of results - Developer
- Meta, based in the US
Weights not published - Released
- 15 Oct 2026
Where it stands among the models you could choose
Available models grouped by price, intelligence, speed and developer location. Retired models are excluded.
| Among | Intelligence Index | Spring Prompt overall | Price, blended | Speed |
|---|---|---|---|---|
| Models available today | 32nd of 203Claude Opus 5.5 | – | – | 24th of 65Gemini 3.5 Flash-Lite |
| Models with similar intelligence | sets this group | – | – | 3rd of 11DeepSeek-V4.1-Flash |
| Models writing 100–200 tokens a second | 6th of 22Claude Sonnet 5.5 | – | – | sets this group |
| Models from developers based in the US | 23rd of 97Claude Opus 5.5 | – | – | 14th of 33Gemini 3.5 Flash-Lite |
The name under each rank is the leader of that group; green is the top quarter of the group and red the bottom quarter, by rank. Price is shown as a percentile: the share of the group that costs less, so lower is cheaper. "Sets this group" marks the measure the group is defined by. Spring Prompt overall is our score out of 100 across every source (how it works). Price is the developer's list price (or the typical OpenRouter host where we haven't read one) for three input tokens to one output; intelligence and speed are from Artificial Analysis (data sourced from Artificial Analysis); "similar intelligence" means within 4 points on its Intelligence Index. Developer locations are where each company is based, not where a model is served. Groups under 3 models are not ranked.
How good is it, and for what?
Each use case ranks the available models its benchmarks measured. The bar shows its percentile in that field, best to the right. Open a row for the results behind it.
Product listingsTurning a sparse product feed and photos into listings that can go live
- CatalogBench: has not measured this model.
Decks from an analysisTurning a finished analysis into a deck you could present as it is
- DeckBench: has not measured this model.
User surveysPlanning a user survey and reading its results without being misled
- SurveyBench: has not measured this model.
Marketing planningPlanning a year of ad spend without overspending
- ROASBench: has not measured this model.
Agents and tool useMulti-step tasks with tools: support desks, coding agents, function calls
| Benchmark | Muse Spark Open | Rank among available | Best available |
|---|---|---|---|
| Artificial AnalysisArtificial Analysis: Terminal-Bench 4.0 · reported | 8.1% | 40th of 110 | Claude Sonnet 5.5 63.6% |
| Artificial AnalysisArtificial Analysis: Terminal-Bench 2.1 · reported | 76.4% | 31st of 116 | Claude Fable 5.1 91.4% |
- tau2-bench: pending. Its latest results are dated 26 May 2026, before this model was released.
- Berkeley Function Calling Leaderboard (BFCL) V4: pending. Its latest results are dated 16 Dec 2025, before this model was released.
- OpenHands Index: pending. Its latest results are dated 30 Jun 2026, before this model was released.
- Microsoft STATE-Bench: pending. Its latest results are dated 29 May 2026, before this model was released.
- Vending-Bench 2: pending. Its latest results are dated 1 Oct 2026, before this model was released.
Professional workReal tasks from banking, consulting and law, business documents and freelance projects
- APEX-Agents: pending. Its latest results are dated 1 Oct 2026, before this model was released.
- GDP.pdf: pending. Its latest results are dated 1 Oct 2026, before this model was released.
- Remote Labor Index: pending. Its latest results are dated 1 Oct 2026, before this model was released.
Reasoning and knowledgeHard questions across science, maths and general knowledge
| Benchmark | Muse Spark Open | Rank among available | Best available |
|---|---|---|---|
| Artificial AnalysisArtificial Analysis: Artificial Analysis Intelligence Index · reported | 38.9 | 32nd of 203 | Claude Opus 5.5 57.6 |
| Artificial AnalysisArtificial Analysis: Humanity's Last Exam · reported | 43.9% | 25th of 202 | Claude Opus 5.5 61.4% |
| Artificial AnalysisArtificial Analysis: GPQA Diamond · reported | 89.0% | 52nd of 188 | GPT-6 Astra 96.3% |
WritingWhat people prefer in blind comparisons, and judged writing quality
- Arena (formerly LMArena): pending. Its latest results are dated 2 Oct 2026, before this model was released.
- UGI Leaderboard: pending. Its latest results are dated 2 Oct 2026, before this model was released.
Sticking to the factsSummarising without inventing things, and factual answers
- Vectara Hallucination Leaderboard: pending. Its latest results are dated 22 Sep 2026, before this model was released.
- Arena (formerly LMArena): pending. Its latest results are dated 2 Oct 2026, before this model was released.
- SimpleQA Verified (Epoch AI): pending. Its latest results are dated 29 Sep 2026, before this model was released.
Speed under pressureGood decisions against a real clock (fast chess)
- BulletBench: has not measured this model.
Nearest alternatives
- Open weights at similar intelligenceMiMo-V2.6-Flash$0.18 blended · Intelligence Index 37.9
Against Muse Spark Open, Intelligence Index 38.9. "Similar intelligence" means within 4 points or better.
Against the alternatives
The models you would most likely weigh it against: the leaders of the groups above.
Scroll sideways to see every alternative.
| Muse Spark Open | DeepSeek-V4.1-Flash fastest with similar intelligence | Claude Opus 5.5 most intelligent available today | Muse Wonder Meta's best other model | GPT-6.1 Sol near the top overall | |
|---|---|---|---|---|---|
| Price per million tokens | – | $0.52 | $8.00 | $8.00 | $4.00 |
| Tokens a second | 142 | 369 | 96 | 153 | 53 |
| Intelligence Index | 38.9 | 39.5 | 57.6 | 52.4 | 51.8 |
| Spring Prompt overall | – | 53 | 85 | 72 | 80 |
| Rank among available models, by use case | |||||
| Product listings | – | 10th | 9th | 4th | 2nd |
| Decks from an analysis | – | – | 4th | 9th | 3rd |
| User surveys | – | – | 1st | 2nd | 3rd |
| Marketing planning | – | – | 5th | 13th | – |
| Agents and tool use | 53rd of 169 | 28th | 2nd | 8th | 5th |
| Professional work | pending | – | 3rd | – | 9th |
| Reasoning and knowledge | 41st of 203 | 40th | 1st | 7th | 6th |
| Writing | pending | 29th | 5th | – | 16th |
| Sticking to the facts | pending | 24th | 3rd | – | 19th |
| Speed under pressure | – | – | – | 13th | 3rd |
Shaded figures are better than Muse Spark Open's. A dash means no result.
Where it has been measured
3rd fastest of the 11 models with similar intelligence. Compared with the models available today (it is not on sale itself), in the top quarter (by percentile) for reasoning and knowledge. Results for professional work, writing and sticking to the facts are pending: those sources last updated before this model was released.
- Artificial Analysis9 results
- APEX-AgentsPending: latest results 1 Oct 2026
- Arena (formerly LMArena)Pending: latest results 2 Oct 2026
- Berkeley Function Calling Leaderboard (BFCL) V4Pending: latest results 16 Dec 2025
- GDP.pdfPending: latest results 1 Oct 2026
- Microsoft STATE-BenchPending: latest results 1 Jul 2026
- OpenHands IndexPending: latest results 30 Jun 2026
- Remote Labor IndexPending: latest results 1 Oct 2026
- SimpleQA Verified (Epoch AI)Pending: latest results 29 Sep 2026
- tau2-benchPending: latest results 3 Aug 2026
- UGI LeaderboardPending: latest results 2 Oct 2026
- Vectara Hallucination LeaderboardPending: latest results 22 Sep 2026
- Vending-Bench 2Pending: latest results 1 Oct 2026
- BulletBenchNot measured
- CatalogBenchNot measured
- DeckBenchNot measured
- ROASBenchNot measured
- SurveyBenchNot measured
Every result
9 published results from 1 source, each in the source's own units, with the configuration that produced it.
Artificial Analysis · reported by Artificial Analysis · 9 results
| Measure | Value | Rank | Configuration | Dated |
|---|---|---|---|---|
| Artificial Analysis: Artificial Analysis Intelligence Indexindex score, higher is better | 38.9 | 71 of 413 | Muse Spark Open (xhigh reasoning) | 20 Oct 2026 |
| Artificial Analysis: GPQA Diamond% of questions, higher is better | 89.0% | 83 of 360 | Muse Spark Open (xhigh reasoning) | 20 Oct 2026 |
| Artificial Analysis: Humanity's Last Exam% of questions, higher is better | 43.9% | 52 of 411 | Muse Spark Open (xhigh reasoning) | 20 Oct 2026 |
| Artificial Analysis: Long-context reasoning (AA-LCR)% of questions, higher is better | 78.3% | 103 of 399 | Muse Spark Open (xhigh reasoning) | 20 Oct 2026 |
| Artificial Analysis: Output speedtokens per second, higher is better | 142 | 43 of 137 | Muse Spark Open (xhigh reasoning) | 20 Oct 2026 |
| Artificial Analysis: SciCode% of problems, higher is better | 58.4% | 21 of 197 | Muse Spark Open (xhigh reasoning) | 20 Oct 2026 |
| Artificial Analysis: Terminal-Bench 2.1% of tasks, higher is better | 76.4% | 60 of 188 | Muse Spark Open (xhigh reasoning) | 20 Oct 2026 |
| Artificial Analysis: Terminal-Bench 4.0% of tasks, higher is better | 8.1% | 90 of 193 | Muse Spark Open (xhigh reasoning) | 20 Oct 2026 |
| Artificial Analysis: Time to first answer tokenseconds, lower is better | 14.6 | 73 of 137 | Muse Spark Open (xhigh reasoning) | 20 Oct 2026 |
Not shown: Not business work, and a blend: read the parts for any one task.