MODEL PROOF
Muse Spark 1.3
TRADE-OFF
A stored alternative scores higher and costs less, with capability losses.
Gemini 3.8 Flash · 5 points higher independent score · 25% lower measured price
- 944K → 66K max output
- Independent LMArena score
- 1,489.7 ± 8.83 · 4,723 votes
- 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
MODEL MONUMENT
Save or share this proof
Meta: Muse Spark 1.3. Balanced workload. Alternative has a trade-off. Evidence as of 19 Sept 2026.
$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. Gemini 3.8 Flash scores higher and costs less — but you would give something up.
Every price dimension
| Input | $1.25/M |
|---|---|
| Output | $4.25/M |
| Cached input | $0.150/M |
| Web search | $0.0025/call |
Who sells it
The same weights, different shops. Cheapest is not like-for-like when serving precision differs.
| Seller | Input | Output | Precision | Uptime (1d) |
|---|---|---|---|---|
| Meta | $1.25 | $4.25 | undeclared | 100.00% |
Independent scores
| LMArena Elo | 1489.7max |
|---|
LMArena Elo under CC BY 4.0. Absence of another board is not a score of zero.
Best rankings by task
- website #1of 114 1364
- uicomponent #1of 104 1381
- 3d #1of 100 1431
- codecategories #2of 108 1373
- svg #3of 77 1344
- fullstack #3of 41 1318
- webapps #3of 39 1313
- gamedev #4of 107 1371
Capability
| Context window | 1.0M |
|---|---|
| Max output | 944K |
| Input modes | text, image, video, file, audio |
| Tool use | yes |
| Reasoning | always on |
Provenance
| Price source | openrouter.ai |
|---|---|
| Fetched | 2026-09-19 |
| Quality data | verified |
Muse Spark 1.3 is a multimodal reasoning model from Meta for long-running agentic, multi-agent, and coding workflows. It is designed to keep track of information across extended tasks, work through...
Questions this page answers
What does Muse Spark 1.3 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 1.3 have an independent quality score?
Muse Spark 1.3 has an LMArena score in this catalogue.
What beats Muse Spark 1.3?
Gemini 3.8 Flash scores higher and costs less — but you would give something up.
Does this page use Artificial Analysis scores for Muse Spark 1.3?
No. Artificial Analysis figures are not published here. Quality on this page is LMArena Elo where a score exists; otherwise the row is unrated.
Check whether this is still the one to buy Cheaper alternatives
Badge
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-1.3/)<a href="https://undominated.ai/models/meta__muse-spark-1.3/"><img src="https://undominated.ai/badge/meta__muse-spark-1.3.svg" alt="Muse Spark 1.3 — Undominated.ai dominance verdict" height="36"></a>Direct file: https://undominated.ai/badge/meta__muse-spark-1.3.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.
