Compare · ModelsLive · 2 picked · head to head
Claude Opus 5.5 vs Muse Spark Open
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Opus 5.5 wins on 8/8 benchmarks
Claude Opus 5.5 wins 8 of 8 shared benchmarks. Leads in agentic · reasoning · math.
Category leads
agentic·Claude Opus 5.5reasoning·Claude Opus 5.5math·Claude Opus 5.5knowledge·Claude Opus 5.5
Hype vs Reality
Attention vs performance
Claude Opus 5.5
#10 by perf·#5 by attention
Muse Spark Open
#35 by perf·no signal
Best value
Muse Spark Open
3.9x better value than Claude Opus 5.5
Claude Opus 5.5
6.2 pts/$
$12.00/M
Muse Spark Open
24.0 pts/$
$2.75/M
Vendor risk
Who is behind the model
Anthropic
$965.0B·Tier 1
Meta AI
$1.65T·Tier 1
Head to head
8 benchmarks · 2 models
Claude Opus 5.5Muse Spark Open
APEX-Agents
Claude Opus 5.5 leads by +40.1
APEX-Agents · evaluates AI agents on complex, multi-step tasks requiring planning, tool use, and autonomous decision-making in realistic environments.
Claude Opus 5.5
73.5
Muse Spark Open
33.4
ARC-AGI
Claude Opus 5.5 leads by +9.5
ARC-AGI · the original Abstraction and Reasoning Corpus, testing whether AI can solve novel visual pattern recognition tasks without memorization.
Claude Opus 5.5
98.5
Muse Spark Open
89.0
ARC-AGI-2
Claude Opus 5.5 leads by +35.8
ARC-AGI-2 · the second iteration of the Abstraction and Reasoning Corpus, testing novel pattern recognition and abstract reasoning without prior training data.
Claude Opus 5.5
93.3
Muse Spark Open
57.5
FrontierMath-Tier-4-v2-Private
Claude Opus 5.5 leads by +63.3
Claude Opus 5.5
95.0
Muse Spark Open
31.7
FrontierMath-Tiers-1-3-v2-Private
Claude Opus 5.5 leads by +22.5
Claude Opus 5.5
96.0
Muse Spark Open
73.5
GPQA diamond
Claude Opus 5.5 leads by +2.8
Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs.
Claude Opus 5.5
91.1
Muse Spark Open
88.3
OTIS Mock AIME 2024-2025
Claude Opus 5.5 leads by +2.0
OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills.
Claude Opus 5.5
100.0
Muse Spark Open
98.0
SimpleQA Verified
Claude Opus 5.5 leads by +15.6
SimpleQA Verified · short factual questions with verified answers, measuring factual accuracy and the tendency to hallucinate or provide incorrect information.
Claude Opus 5.5
72.2
Muse Spark Open
56.6
Full benchmark table
| Benchmark | Claude Opus 5.5 | Muse Spark Open |
|---|---|---|
APEX-Agents APEX-Agents · evaluates AI agents on complex, multi-step tasks requiring planning, tool use, and autonomous decision-making in realistic environments. | 73.5 | 33.4 |
ARC-AGI ARC-AGI · the original Abstraction and Reasoning Corpus, testing whether AI can solve novel visual pattern recognition tasks without memorization. | 98.5 | 89.0 |
ARC-AGI-2 ARC-AGI-2 · the second iteration of the Abstraction and Reasoning Corpus, testing novel pattern recognition and abstract reasoning without prior training data. | 93.3 | 57.5 |
FrontierMath-Tier-4-v2-Private | 95.0 | 31.7 |
FrontierMath-Tiers-1-3-v2-Private | 96.0 | 73.5 |
GPQA diamond Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs. | 91.1 | 88.3 |
OTIS Mock AIME 2024-2025 OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills. | 100.0 | 98.0 |
SimpleQA Verified SimpleQA Verified · short factual questions with verified answers, measuring factual accuracy and the tendency to hallucinate or provide incorrect information. | 72.2 | 56.6 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $4.00 | $20.00 | 1.0M tokens (~500 books) | $80.00 | |
| $1.25 | $4.25 | 1.0M tokens (~524 books) | $20.00 |
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