token.app › Compare › GPT-5 Nano vs Grok 4.5
GPT-5 Nano vs Grok 4.5
Grok 4.5 leads on 5 of 5 shared benchmarks. GPT-5 Nano is 22× cheaper per token on a blended 3:1 basis. Grok 4.5 accepts the larger context window (500K).
Head to head
Blended price uses a 3:1 input:output mix
| GPT-5 Nano | Grok 4.5 | |
|---|---|---|
| Provider | OpenAI | xAI |
| Input $/1M | $0.050 | $2.00 |
| Output $/1M | $0.400 | $6.00 |
| Blended $/1M | $0.138 | $3.00 |
| Context window | 400K | 500K |
| Max output | 128K | — |
| Released | Aug 2025 | Jul 2026 |
| Licence | Proprietary | Proprietary |
| GPQA Diamond | 69.4% | 93.4% |
| FrontierMath T1–3 | 20.0% | 57.2% |
| FrontierMath T4 | 2.4% | 24.4% |
| SimpleQA Verified | 12.2% | 53.5% |
| OTIS Mock AIME | 81.1% | 97.8% |
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-5 Nano if…
- Costs less per token — $0.138 vs $3.00 blended
Choose Grok 4.5 if…
- Higher GPQA Diamond (93.4% vs 69.4%)
- Higher FrontierMath T1–3 (57.2% vs 20.0%)
- Higher FrontierMath T4 (24.4% vs 2.4%)
- Higher SimpleQA Verified (53.5% vs 12.2%)
- Larger context window (500K)
- Newer model (released Jul 2026)
FAQ
Which is better, GPT-5 Nano or Grok 4.5?
Across the 5 benchmarks both models have independently-run scores for, GPT-5 Nano leads on 0 and Grok 4.5 leads on 5. Benchmarks are one input — price and context window are on this page too.
Is GPT-5 Nano cheaper than Grok 4.5?
GPT-5 Nano is cheaper: $0.138 versus $3.00 per million tokens blended at 3:1 input:output. Input alone: $0.050 vs $2.00. Output alone: $0.400 vs $6.00.
What context windows do GPT-5 Nano and Grok 4.5 have?
GPT-5 Nano: 400,000 tokens. Grok 4.5: 500,000 tokens.
Who makes GPT-5 Nano and Grok 4.5?
GPT-5 Nano is made by OpenAI. Grok 4.5 is made by xAI.