Compare · ModelsLive · 2 picked · head to head
o3 Mini vs GPT-5 Nano
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
o3 Mini wins on 8/9 benchmarks
o3 Mini wins 8 of 9 shared benchmarks. Leads in reasoning · knowledge · math.
Category leads
reasoning·o3 Miniknowledge·o3 Minimath·o3 Minicoding·o3 Mini
Hype vs Reality
Attention vs performance
o3 Mini
#151 by perf·no signal
GPT-5 Nano
#114 by perf·no signal
Best value
GPT-5 Nano
14.4x better value than o3 Mini
o3 Mini
14.0 pts/$
$2.75/M
GPT-5 Nano
201.3 pts/$
$0.23/M
Vendor risk
Who is behind the model
OpenAI
$840.0B·Tier 1
OpenAI
$840.0B·Tier 1
Head to head
9 benchmarks · 2 models
o3 MiniGPT-5 Nano
ARC-AGI
o3 Mini leads by +13.8
ARC-AGI · the original Abstraction and Reasoning Corpus, testing whether AI can solve novel visual pattern recognition tasks without memorization.
o3 Mini
34.5
GPT-5 Nano
20.7
ARC-AGI-2
o3 Mini leads by +0.4
ARC-AGI-2 · the second iteration of the Abstraction and Reasoning Corpus, testing novel pattern recognition and abstract reasoning without prior training data.
o3 Mini
3.0
GPT-5 Nano
2.6
Fiction.LiveBench
o3 Mini leads by +5.6
Fiction.LiveBench · a continuously updated benchmark using recently published fiction to test reading comprehension and reasoning, preventing data contamination.
o3 Mini
50.0
GPT-5 Nano
44.4
FrontierMath-2025-02-28-Private
o3 Mini leads by +4.1
FrontierMath (Feb 2025) · original research-level math problems created by mathematicians, testing capabilities at the boundary of current AI mathematical reasoning.
o3 Mini
12.4
GPT-5 Nano
8.3
FrontierMath-Tier-4-2025-07-01-Private
o3 Mini leads by +2.1
FrontierMath Tier 4 (Jul 2025) · the most challenging tier of frontier mathematics, containing problems that push the absolute limits of AI mathematical reasoning.
o3 Mini
4.2
GPT-5 Nano
2.1
GPQA diamond
o3 Mini leads by +10.1
Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs.
o3 Mini
69.4
GPT-5 Nano
59.3
MATH level 5
o3 Mini leads by +1.3
MATH Level 5 · the hardest tier of the MATH benchmark, featuring competition-level problems from AMC, AIME, and Olympiad-style mathematics.
o3 Mini
96.5
GPT-5 Nano
95.2
OTIS Mock AIME 2024-2025
GPT-5 Nano leads by +4.2
OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills.
o3 Mini
76.9
GPT-5 Nano
81.1
WeirdML
o3 Mini leads by +5.6
WeirdML · tests models on unusual and adversarial machine learning tasks that require creative problem-solving beyond standard patterns.
o3 Mini
43.7
GPT-5 Nano
38.1
Full benchmark table
| Benchmark | o3 Mini | GPT-5 Nano |
|---|---|---|
ARC-AGI ARC-AGI · the original Abstraction and Reasoning Corpus, testing whether AI can solve novel visual pattern recognition tasks without memorization. | 34.5 | 20.7 |
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. | 3.0 | 2.6 |
Fiction.LiveBench Fiction.LiveBench · a continuously updated benchmark using recently published fiction to test reading comprehension and reasoning, preventing data contamination. | 50.0 | 44.4 |
FrontierMath-2025-02-28-Private FrontierMath (Feb 2025) · original research-level math problems created by mathematicians, testing capabilities at the boundary of current AI mathematical reasoning. | 12.4 | 8.3 |
FrontierMath-Tier-4-2025-07-01-Private FrontierMath Tier 4 (Jul 2025) · the most challenging tier of frontier mathematics, containing problems that push the absolute limits of AI mathematical reasoning. | 4.2 | 2.1 |
GPQA diamond Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs. | 69.4 | 59.3 |
MATH level 5 MATH Level 5 · the hardest tier of the MATH benchmark, featuring competition-level problems from AMC, AIME, and Olympiad-style mathematics. | 96.5 | 95.2 |
OTIS Mock AIME 2024-2025 OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills. | 76.9 | 81.1 |
WeirdML WeirdML · tests models on unusual and adversarial machine learning tasks that require creative problem-solving beyond standard patterns. | 43.7 | 38.1 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $1.10 | $4.40 | 200K tokens (~100 books) | $19.25 | |
| $0.05 | $0.40 | 400K tokens (~200 books) | $1.38 |
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