Updated daily at 05:00 UTC
- Released
- 8 Apr 2026
- Status
- Legacy
- Context
- 1M
- Max output
- —
- Input per 1M tokens
- $1.25
- Output per 1M tokens
- $4.25
- Open weights
- No
- License
- proprietary
- Parameters
- —
- Knowledge cutoff
- —
- Reasoning
- Yes
- Modalities
- text, image, video, audio, pdf → text
Category scores
Out of 100, from independent and third-party results only, by method category-2026-09-29.1.
| Category | Score | Rank | Coverage |
|---|---|---|---|
| Knowledge & reasoning | 58.7 | Not ranked | 1 of 4 |
| Coding & software engineering | 53.3 | Not ranked | 1 of 5 |
| Factuality & hallucination | 57.8 | 15 | 1 of 1 |
| Human preference | 56.7 | 12 | 4 of 5 |
Benchmark results
Every result we hold for this model, with who ran it and where it was published.
Knowledge & reasoning
| Benchmark | Metric | Value | Provenance | Setting | Evaluated | Source |
|---|---|---|---|---|---|---|
| DTBench (Decision Theory Benchmark) | Accuracy (capability questions) | 94.4% | Third party | high | — | https://conceptualreasoning.ai/dtbench via Epoch AI |
| LMCA (Language Model Conceptual Argumentation) | Correlation with expert ratings (Pearson r) | 0.4991 | Third party | high | — | https://conceptualreasoning.ai/lmca via Epoch AI |
Scientific reasoning
| Benchmark | Metric | Value | Provenance | Setting | Evaluated | Source |
|---|---|---|---|---|---|---|
| Surface Evolver Bench | Mean score (partial credit) | 52.5% | Third party | high | — | https://yhenon.github.io/surface-evolver-llm-eval/ via Epoch AI |
Coding & software engineering
| Benchmark | Metric | Value | Provenance | Setting | Evaluated | Source |
|---|---|---|---|---|---|---|
| DeepSWE | Pass@1 | 53.3% | Third party | — | — | https://deepswe.datacurve.ai/ via Epoch AI |
Factuality & hallucination
| Benchmark | Metric | Value | Provenance | Setting | Evaluated | Source |
|---|---|---|---|---|---|---|
| SimpleQA Verified | Accuracy (% correct) | 57.8% | Independent | — | 31 Aug 2026 | Epoch AI |
Human preference
| Benchmark | Metric | Value | Provenance | Setting | Evaluated | Source |
|---|---|---|---|---|---|---|
| Code Arena: WebDev (arena.ai) | Arena score (Elo scale) | 1541 | Independent | — | 25 Sep 2026 | Arena |
| Code Arena: WebDev (arena.ai) | Votes | 8102 | Independent | — | 25 Sep 2026 | Arena |
| Document Arena (arena.ai) | Arena score (Elo scale) | 1479 | Independent | — | 13 Sep 2026 | Arena |
| Document Arena (arena.ai) | Votes | 4885 | Independent | — | 13 Sep 2026 | Arena |
| Text Arena (arena.ai) | Arena score (Elo scale) | 1491 | Independent | — | 25 Sep 2026 | Arena |
| Text Arena (arena.ai) | Votes | 34760 | Independent | — | 25 Sep 2026 | Arena |
| Vision Arena (arena.ai) | Arena score (Elo scale) | 1280 | Independent | — | 28 Sep 2026 | Arena |
| Vision Arena (arena.ai) | Votes | 10906 | Independent | — | 28 Sep 2026 | Arena |
Other Muse Spark versions
- Muse Spark 1.32 Sep 2026
- Muse Spark 1.25 Aug 2026