Muse Spark 1.3 vs Step 5 Preview
Muse Spark 1.3 
Step 5 Preview Verdict
- Muse Spark 1.3 (max) leads on quality: 69.3 vs 65.0.
- Muse Spark 1.3 (max) is stronger in agents & tools, coding, composite, human preference, knowledge, maths, multimodal, reasoning.
- Step 5 Preview is stronger in long context.
- Step 5 Preview is 1.4× cheaper ($1.43 vs $2.00 per 1M blended).
| Metric | Muse Spark 1.3 (max) | Step 5 Preview |
|---|---|---|
| BenchLeader Index | 69.3 | 65.0 |
| Agents & tools score | 71.1 | – |
| Coding score | 66.6 | – |
| Composite score | 90.1 | 84.4 |
| Human preference score | 69.8 | – |
| Knowledge score | 76.1 | 72.0 |
| Long context score | 68.0 | 70.8 |
| Maths score | 69.2 | – |
| Multimodal score | 67.4 | 60.8 |
| Reasoning score | 83.1 | 82.1 |
| Blended price $/M | $2.00 | $1.43 |
| Output speed | 223 tok/s | – |
| Time to first answer | 34.8 s | – |
| Context window | 1.0M | 1M |
| LMArena Text | 1493 | – |
| LMArena Hard Prompts | 1516 | – |
| LMArena Coding | 1537 | – |
| LMArena WebDev | 1652 | – |
| LMArena Vision | 1315 | – |
| LMArena Agent | 4.2 | – |
| AA Intelligence Index | 48.2 | 43.6 |
| AA-LCR | 83.0% | 88.3% |
| MMMU-Pro | – | 76.4% |
| AA-Omniscience | 25 | 16.4 |
| GPQA Diamond (AA) | 93.5% | – |
| Humanity's Last Exam (AA) | 48.7% | 46.5% |
| SciCode (AA) | 58.8% | 58.9% |
| IOI | 56.6% | – |
| Terminal-Bench 2.1 (Vals) | 79.0% | – |
| Vals Index | 64.5 | – |
| CritPt | 24.9% | 20.9% |
| GDPval (AA) | 60.2% | 53.6% |
| τ²-Bench Banking (AA) | 50.5% | – |
| Code Migration | 47.4% | – |
| Excel Modeling Benchmark | 67.4% | – |
| Finance Agent v2 | 60.0% | – |
| Harvey's Legal Agent Benchmark | 23.8% | – |
| Legal Research Bench | 55.3% | – |
| MysteryMechanism | 36.0% | – |
| Terminal-Bench 4.0 (Vals) | 27.8% | – |
| Terminal-Bench Science | 14.3% | – |
| Vibe Code Bench 1-100 | 20.5% | – |
| Vibe Code Bench v1.1 | 85.9% | – |
| LMArena Maths | 1496 | – |
| LMArena Creative Writing | 1453 | – |
| LMArena Instruction Following | 1483 | – |
| LMArena Multi-turn | 1493 | – |
| LMArena Longer Queries | 1506 | – |
| LMArena Document | 1468 | – |
Data as of 2026-09-19. Best configuration of each model; every score links to its source on the model pages.
Muse Spark 1.3 vs Step 5 Preview: questions
- Is Muse Spark 1.3 better than Step 5 Preview?
- Muse Spark 1.3 (max) leads on quality: 69.3 vs 65.0. The BenchLeader Index combines every independent quality benchmark; Muse Spark 1.3 (max) is ahead overall as of 2026-09-19, but check the category scores for your use.
- Which is cheaper, Muse Spark 1.3 or Step 5 Preview?
- Step 5 Preview is cheaper: $1.43 against $2.00 per million tokens, blended at three input tokens per output token.
- Which has the larger context window?
- Muse Spark 1.3 accepts more context: 1.0M against 1M tokens.