Comparing 2 models
Claude Opus 5.5 vs Muse Spark 1.3
Benchmarks through
Verdict
Claude Opus 5.5 places higher on 8 of the 13 tasks where both are ranked. Muse Spark 1.3 costs 3.2x less per input token. Muse Spark 1.3 accepts 1.0x more context.
- Choose Claude Opus 5.5 for Frontend & UI (#1), Image Understanding (#2), Competition Math (#2).
- Choose Muse Spark 1.3 for a General Assistant (#4), JSON & Schema Output (#5), Structured Data Extraction (#5).
Built from the published task rankings below; ranks come from each task's own weighted benchmarks, so a win on one task says nothing about another.
Measured head to head
Benchmarks both models were run on
| Evaluation | Claude Opus 5.5 | Muse Spark 1.3 | Source |
|---|---|---|---|
| Design Arena Coding | 1392 Elo | 1353 Elo | source · 2026-10-16 |
| Design Arena UI | 1378 Elo | 1344 Elo | source · 2026-10-16 |
| Design Arena Website | 1338 Elo | 1348 Elo | source · 2026-10-16 |
| FrontierMath Tiers 1-3 (Epoch AI) | 91.2% ± 1.7 | 74.4% ± 2.6 | source · 2026-09-22 |
| LiveBench Agentic Coding | 71.7% | 64.1% | source · 2026-10-16 |
| LiveBench Coding | 89.3% | 81.1% | source · 2026-10-16 |
| LiveBench Data Analysis | 80.3% | 79.6% | source · 2026-10-16 |
| LiveBench Instruction Following | 65.7% | 78% | source · 2026-10-16 |
| LiveBench Language | 86.3% | 82.8% | source · 2026-10-16 |
| LiveBench Math | 97.1% | 96.0% | source · 2026-10-16 |
| LiveBench Reasoning | 92.2% | 89.7% | source · 2026-10-16 |
| LMArena Agent | 17.2 | 3.6 | source · 2026-10-14 |
| LMArena Agent Bash Recovery | 13.6 | 6.1 | source · 2026-10-08 |
| LMArena Agent Steerability | 17.9 | 5.6 | source · 2026-10-14 |
| LMArena Agent Task Outcome | 19.4 | 4.9 | source · 2026-10-14 |
| LMArena Agent Tool Hallucination | 0.5 | 0.6 | source · 2026-10-14 |
| LMArena Creative Writing | 1534 Elo | 1460 Elo | source · 2026-10-15 |
| LMArena Instruction Following | 1536 Elo | 1478 Elo | source · 2026-10-15 |
| LMArena Long Query | 1531 Elo | 1488 Elo | source · 2026-10-15 |
| LMArena Math | 1508 Elo | 1496 Elo | source · 2026-10-15 |
| LMArena Text | 1508 Elo | 1494 Elo | source · 2026-10-15 |
| LMArena Text Factuality | 1509 Elo | 1479 Elo | source · 2026-10-15 |
| LMArena Vision | 1293 Elo | 1290 Elo | source · 2026-10-09 |
| LMArena Vision Diagrams | 1324 Elo | 1321 Elo | source · 2026-10-09 |
| LMArena Vision OCR | 1307 Elo | 1306 Elo | source · 2026-10-09 |
| LMArena WebDev | 1811 Elo | 1659 Elo | source · 2026-10-13 |
| LMArena WebDev Image-to-Web | 1749 Elo | 1642 Elo | source · 2026-10-09 |
| OTIS Mock AIME (Epoch AI) | 100% ± 0 | 99.2% ± 0.6 | source · 2026-09-22 |
| Terminal-Bench (4.0) | 64.8% | 14.6% | source · 2026-10-16 |
Values are as published by each evaluator, in its own units; rows from different evaluators are not on a common scale.
task evidence
How they place when the question changes
Lower ranks are better. “Best” marks the strongest option in this shortlist for that task.