token.app › Compare › GPT-4o vs GPT-5 Nano
GPT-4o vs GPT-5 Nano
GPT-5 Nano leads on 2 of 2 shared benchmarks. GPT-5 Nano is 32× cheaper per token on a blended 3:1 basis. GPT-5 Nano accepts the larger context window (400K).
Head to head
Blended price uses a 3:1 input:output mix
| GPT-4o | GPT-5 Nano | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Input $/1M | $2.50 | $0.050 |
| Output $/1M | $10.00 | $0.400 |
| Blended $/1M | $4.38 | $0.138 |
| Context window | 128K | 400K |
| Max output | 16K | 128K |
| Released | May 2024 | Aug 2025 |
| Licence | Proprietary | Proprietary |
| GPQA Diamond | 47.9% | 69.4% |
| OTIS Mock AIME | 6.3% | 81.1% |
Benchmark scores independently run and published by Epoch AI, 'AI Benchmarking Hub', used under CC BY 4.0. Only benchmarks with a score for BOTH models are compared.
Choose GPT-4o if…
- No clear advantage on the data we hold.
Choose GPT-5 Nano if…
- Costs less per token — $0.138 vs $4.38 blended
- Higher GPQA Diamond (69.4% vs 47.9%)
- Higher OTIS Mock AIME (81.1% vs 6.3%)
- Larger context window (400K)
- Newer model (released Aug 2025)
FAQ
Which is better, GPT-4o or GPT-5 Nano?
Across the 2 benchmarks both models have independently-run scores for, GPT-4o leads on 0 and GPT-5 Nano leads on 2. Benchmarks are one input — price and context window are on this page too.
Is GPT-4o cheaper than GPT-5 Nano?
GPT-5 Nano is cheaper: $0.138 versus $4.38 per million tokens blended at 3:1 input:output. Input alone: $2.50 vs $0.050. Output alone: $10.00 vs $0.400.
What context windows do GPT-4o and GPT-5 Nano have?
GPT-4o: 128,000 tokens. GPT-5 Nano: 400,000 tokens.
Who makes GPT-4o and GPT-5 Nano?
GPT-4o is made by OpenAI. GPT-5 Nano is made by OpenAI.