Compare · ModelsLive · 2 picked · head to head
GPT-5.5 Pro vs Muse Spark Open
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
GPT-5.5 Pro wins on 7/7 benchmarks
GPT-5.5 Pro wins 7 of 7 shared benchmarks. Leads in reasoning · math · knowledge.
Category leads
reasoning·GPT-5.5 Promath·GPT-5.5 Proknowledge·GPT-5.5 Pro
Hype vs Reality
Attention vs performance
GPT-5.5 Pro
#8 by perf·#9 by attention
Muse Spark Open
#35 by perf·no signal
Best value
Muse Spark Open
33.0x better value than GPT-5.5 Pro
GPT-5.5 Pro
0.7 pts/$
$105.00/M
Muse Spark Open
24.0 pts/$
$2.75/M
Vendor risk
Who is behind the model
OpenAI
$840.0B·Tier 1
Meta AI
$1.62T·Tier 1
Head to head
7 benchmarks · 2 models
GPT-5.5 ProMuse Spark Open
ARC-AGI
GPT-5.5 Pro leads by +7.5
ARC-AGI · the original Abstraction and Reasoning Corpus, testing whether AI can solve novel visual pattern recognition tasks without memorization.
GPT-5.5 Pro
96.5
Muse Spark Open
89.0
ARC-AGI-2
GPT-5.5 Pro leads by +27.1
ARC-AGI-2 · the second iteration of the Abstraction and Reasoning Corpus, testing novel pattern recognition and abstract reasoning without prior training data.
GPT-5.5 Pro
84.6
Muse Spark Open
57.5
FrontierMath-Tier-4-v2-Private
GPT-5.5 Pro leads by +46.3
GPT-5.5 Pro
78.0
Muse Spark Open
31.7
FrontierMath-Tiers-1-3-v2-Private
GPT-5.5 Pro leads by +18.8
GPT-5.5 Pro
92.3
Muse Spark Open
73.5
GPQA diamond
GPT-5.5 Pro leads by +7.4
Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs.
GPT-5.5 Pro
95.7
Muse Spark Open
88.3
OTIS Mock AIME 2024-2025
GPT-5.5 Pro leads by +2.0
OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills.
GPT-5.5 Pro
100.0
Muse Spark Open
98.0
SimpleQA Verified
GPT-5.5 Pro leads by +7.9
SimpleQA Verified · short factual questions with verified answers, measuring factual accuracy and the tendency to hallucinate or provide incorrect information.
GPT-5.5 Pro
64.5
Muse Spark Open
56.6
Full benchmark table
| Benchmark | GPT-5.5 Pro | Muse Spark Open |
|---|---|---|
ARC-AGI ARC-AGI · the original Abstraction and Reasoning Corpus, testing whether AI can solve novel visual pattern recognition tasks without memorization. | 96.5 | 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. | 84.6 | 57.5 |
FrontierMath-Tier-4-v2-Private | 78.0 | 31.7 |
FrontierMath-Tiers-1-3-v2-Private | 92.3 | 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. | 95.7 | 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. | 64.5 | 56.6 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $30.00 | $180.00 | 1.1M tokens (~525 books) | $675.00 | |
| $1.25 | $4.25 | 1.0M tokens (~524 books) | $20.00 |