Compare · ModelsLive · 2 picked · head to head
Llama 3.1 405B vs GPT-5 Nano
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
GPT-5 Nano wins on 4/4 benchmarks
GPT-5 Nano wins 4 of 4 shared benchmarks. Leads in knowledge · math · coding.
Category leads
knowledge·GPT-5 Nanomath·GPT-5 Nanocoding·GPT-5 Nano
Hype vs Reality
Attention vs performance
Llama 3.1 405B
#151 by perf·no signal
GPT-5 Nano
#112 by perf·no signal
Vendor risk
Who is behind the model
Meta AI
$1.50T·Tier 1
OpenAI
$840.0B·Tier 1
Head to head
4 benchmarks · 2 models
Llama 3.1 405BGPT-5 Nano
GPQA diamond
GPT-5 Nano leads by +24.7
Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs.
Llama 3.1 405B
34.5
GPT-5 Nano
59.3
MATH level 5
GPT-5 Nano leads by +45.5
MATH Level 5 · the hardest tier of the MATH benchmark, featuring competition-level problems from AMC, AIME, and Olympiad-style mathematics.
Llama 3.1 405B
49.8
GPT-5 Nano
95.2
OTIS Mock AIME 2024-2025
GPT-5 Nano leads by +71.5
OTIS Mock AIME 2024–2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills.
Llama 3.1 405B
9.6
GPT-5 Nano
81.1
WeirdML
GPT-5 Nano leads by +16.7
WeirdML · tests models on unusual and adversarial machine learning tasks that require creative problem-solving beyond standard patterns.
Llama 3.1 405B
21.4
GPT-5 Nano
38.1
Full benchmark table
| Benchmark | Llama 3.1 405B | GPT-5 Nano |
|---|---|---|
GPQA diamond Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs. | 34.5 | 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. | 49.8 | 95.2 |
OTIS Mock AIME 2024-2025 OTIS Mock AIME 2024–2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills. | 9.6 | 81.1 |
WeirdML WeirdML · tests models on unusual and adversarial machine learning tasks that require creative problem-solving beyond standard patterns. | 21.4 | 38.1 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| Llama 3.1 405B | — | — | — | — |
| GPT-5 Nano | $0.05 | $0.40 | 400K tokens (~200 books) | $1.38 |
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