MODEL PROOF
Muse Spark Open
NO LMARENA GENERAL SCORE
No LMArena general score is attached to this listing.
deal-only price: No offer passes the like-for-like test, so this price is a fallback: precision not disclosed. · precision not disclosed: The seller whose offer sets this price does not declare its serving precision. It is not read as full precision. · Serving precision differs between offers.
- Independent LMArena score
- No LMArena general score
- Context window
- 1.05M
- Maximum output
- 943.72K
- Input modalities
- text, image, video, file, audio
- Output modalities
- text
- Published input price
- $1.25 / 1M tokens
- Published output price
- $4.25 / 1M tokens
- Pricing kind
- fixed
Inspect complete billing conditions and endpoint terms below.
Price from Fireworks: no serving offer passes the like-for-like test, so this is a fallback. deal-only price precision not disclosed The seller whose offer sets this price does not declare its serving precision. It is not read as full precision.
Every price dimension · USD per million tokens
| Input | $1.25/M |
|---|---|
| Output | $4.25/M |
| Cached input | $0.150/M |
| Cache write | Unknown/M |
| Cache write 1h | Unknown/M |
| Reasoning | Unknown/M |
Who sells it
The same weights, different shops. Cheapest is not like-for-like when serving precision differs.
Headline cheapest is a lower precision. Like-for-like at the best declared precision is $1.25/M from Makora.
6 provider offers · rates, limits and conditions
Rates are USD per million tokens. Endpoint terms can differ even when the quoted price and precision match. A listed parameter is a provider declaration, not a task-success test.
| Seller | Input | Output | Precision | Uptime (1d) |
|---|---|---|---|---|
| Makoramakora/fp4 Endpoint terms
| $1.25 | $4.25 | fp4 | — |
| Nebiusnebius/fp4 Endpoint terms
| $1.25 | $4.25 | fp4 | 98.55% |
| BaseTenbaseten/fp4 Endpoint terms
| $1.25 | $4.25 | fp4 | 99.18% |
| Modalmodal Endpoint terms
| $1.25 | $4.25 | undeclared | 97.05% |
| Togethertogether Endpoint terms
| $1.25 | $4.25 | undeclared | 98.89% |
| Fireworksfireworks Endpoint terms
| $1.25 | $4.25 | undeclared | 99.52% |
Independent scores
No independent benchmark has measured this model. Unrated is not a score of zero.
Best rankings by task
- Websites #10 1313
- Game development #19 1303
Per-task Elo and rank from Design Arena, via OpenRouter’s model feed. The rank is the feed’s, and it counts models OpenRouter does not list.
Capability
| Context window | 1M |
|---|---|
| Max output | 943K |
| Input modes | text, image, video, file, audio |
| Tool use | yes |
| Reasoning | always on |
| Open weights | Unknown |
Provenance
| Price source | openrouter.ai |
|---|---|
| Fetched | 2026-10-21 |
| Quality data | unrated |
Muse Spark Open is a coding-optimized open-weight model. Trained specifically for agentic coding workflows, it delivers higher first-attempt accuracy, reliable tool calling, and deep codebase understanding across the repos developers...
Questions this page answers
What does Muse Spark Open cost?
$1.25/M in, $4.25/M out in this catalogue, as of the fetch date on this page. That is the API row, not a subscription.
Does Muse Spark Open have an independent quality score?
Muse Spark Open has no LMArena general score in this catalogue. Unrated is not a score of zero.
What beats Muse Spark Open?
Muse Spark Open has no LMArena general score. Unrated is not a score of zero.
Does this page use Artificial Analysis scores for Muse Spark Open?
No. Artificial Analysis figures are not published here. Quality on this page is LMArena Elo where a score exists; otherwise the row is unrated.
Does a missing score mean Muse Spark Open scored zero?
Unrated is not a score of zero.
Is the cheapest Muse Spark Open endpoint the same product?
Headline cheapest is a lower precision. Like-for-like at the best declared precision is $1.25/M from Makora.
MODEL MONUMENT
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The verdict as one SVG, for a README or a docs page. It states this model's dominance status at the balanced workload on the LMArena lens, with the date it was computed, and it is rebuilt with the catalogue — so it changes when the verdict changes, including to one you would rather it did not.
[](https://undominated.ai/models/meta__muse-spark-open/)<a href="https://undominated.ai/models/meta__muse-spark-open/"><img src="https://undominated.ai/badge/meta__muse-spark-open.svg" alt="Muse Spark Open — Undominated.ai dominance verdict" height="36"></a>Direct file: https://undominated.ai/badge/meta__muse-spark-open.svg — a static SVG, written by scripts/build-badges.mjs on every build, so the copy you embed is never
older than the last deploy.
