Gemini 4 Argon
Claude Opus 5.5
Muse Wonder
MiMo-V2.6-Pro
Qwen3.8-Max
Kimi K3
GLM-5.3
GPT-5.5
ERNIE 5.1
DeepSeek-V4.1-Flash-20260910
Grok 4.20 Beta
amazon-nova-experimental-chat
Dola Seed 2.0 Pro
NVIDIA-Nemotron-3-Ultra-550B-A55B
Gemma 4 31B
Step 5 PreviewClaude Opus 5 vs Muse Spark
- Claude Opus 5 rates higher on LMArena’s text leaderboard: 1508 against 1474.
- On the 6 Vals AI benchmarks both have taken, Claude Opus 5 wins 6 and Muse Spark wins 0.
LatestMuse Spark 1474
Side by side
Models (2/6)
- Claude Opus 5
- Muse Spark
| Benchmark | Claude Opus 5 | Muse Spark |
|---|---|---|
| The model | ||
| Lab | Anthropic | Meta |
| Released | 2026-07-24 | — |
| Weights | Proprietary | Proprietary |
| Context window | 1M | — |
| Input, per 1M tokens | $5 | — |
| Output, per 1M tokens | $25 | — |
| LMArena, people’s votes | ||
| LMArena TextMillions of people compare two anonymous models side by side and vote for the better answer | 1508#4 of 351 | 1474#26 of 351 |
| LMArena WebDevPeople ask two anonymous models to build the same web app, try both and vote for the better one | 1691#9 of 124 | — |
| LMArena VisionSide-by-side votes on prompts that include an image | 1320#3 of 146 | 1306#15 of 146 |
| LMArena CodingLMArena’s text votes on prompts that ask for code | 1533#4 of 346 | 1481#56 of 346 |
| LMArena MathLMArena’s text votes on math prompts | 1533#2 of 339 | 1456#65 of 339 |
| LMArena Creative writingLMArena’s text votes on stories, poems and other creative writing | 1495#5 of 349 | 1459#26 of 349 |
| LMArena Hard promptsLMArena’s text votes on the hardest prompts | 1527#4 of 351 | 1474#41 of 351 |
| LMArena Instruction followingLMArena’s text votes on prompts with specific instructions to follow | 1518#5 of 351 | 1443#58 of 351 |
| Vals AI, coding | ||
| Terminal-Bench 4.0Frontier-difficulty tasks an agent completes in a real terminal | 53.53%#9 of 55 | — |
| SWE-benchReal GitHub issues from open-source projects | 97.00%#1 of 85 | 74.40%#45 of 85 |
| Vibe Code BenchBuilding complete web apps from a plain-language brief, graded on whether the app works | 88.40%#9 of 115 | 19.67%#84 of 115 |
| LiveCodeBenchFresh competitive programming problems, collected after models’ training cut-offs to avoid contamination | 89.03%#4 of 143 | — |
| Vals AI, finance | ||
| Tax Agent BenchAgentic research into US corporate tax questions | 45.55%#4 of 76 | — |
| Vals AI, law | ||
| Legal Research BenchAgentic US legal research | 55.29%#2 of 85 | — |
| Vals AI, medicine | ||
| MedCodeAssigning the right medical billing codes from clinical notes | 63.57%#1 of 107 | 51.31%#16 of 107 |
| Vals AI, reasoning | ||
| GPQA DiamondGraduate-level questions in biology, physics and chemistry that experts answer well and search does not | 93.43%#8 of 138 | 89.65%#28 of 138 |
| MMLU-ProHarder, reasoning-focused multiple choice across 14 subjects, from law to engineering | 91.59%#2 of 138 | 87.32%#30 of 138 |
| AIMEProblems from the American Invitational Mathematics Examination, a qualifier for the US Math Olympiad | — | 96.88%#3 of 96 |
| MMMUCollege-level questions that need both an image and text | 89.88%#2 of 93 | 87.40%#16 of 93 |
| Terminal-Bench ScienceExpert-written scientific research workflows, run by an agent in a terminal | 27.14%#9 of 42 | — |
Add models in the compare tool.
Questions
Which is better, Claude Opus 5 or Muse Spark?
Claude Opus 5 rates higher on LMArena’s text leaderboard: 1508 against 1474. On the 6 Vals AI benchmarks both have taken, Claude Opus 5 wins 6 and Muse Spark wins 0.