token.app › Compare › gpt-oss-120b vs Grok 4.5
gpt-oss-120b vs Grok 4.5
Grok 4.5 leads on 3 of 3 shared benchmarks. gpt-oss-120b is 43× 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-oss-120b | Grok 4.5 | |
|---|---|---|
| Provider | OpenAI | xAI |
| Input $/1M | $0.037 | $2.00 |
| Output $/1M | $0.170 | $6.00 |
| Blended $/1M | $0.070 | $3.00 |
| Context window | 131K | 500K |
| Max output | 131K | — |
| Released | Aug 2025 | Jul 2026 |
| Licence | Open weights | Proprietary |
| GPQA Diamond | 75.8% | 93.4% |
| SimpleQA Verified | 13.9% | 53.5% |
| OTIS Mock AIME | 88.9% | 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-oss-120b if…
- Costs less per token — $0.070 vs $3.00 blended
- Open weights — self-hostable
Choose Grok 4.5 if…
- Higher GPQA Diamond (93.4% vs 75.8%)
- Higher SimpleQA Verified (53.5% vs 13.9%)
- Higher OTIS Mock AIME (97.8% vs 88.9%)
- Larger context window (500K)
- Newer model (released Jul 2026)
FAQ
Which is better, gpt-oss-120b or Grok 4.5?
Across the 3 benchmarks both models have independently-run scores for, gpt-oss-120b leads on 0 and Grok 4.5 leads on 3. Benchmarks are one input — price and context window are on this page too.
Is gpt-oss-120b cheaper than Grok 4.5?
gpt-oss-120b is cheaper: $0.070 versus $3.00 per million tokens blended at 3:1 input:output. Input alone: $0.037 vs $2.00. Output alone: $0.170 vs $6.00.
What context windows do gpt-oss-120b and Grok 4.5 have?
gpt-oss-120b: 131,072 tokens. Grok 4.5: 500,000 tokens.
Who makes gpt-oss-120b and Grok 4.5?
gpt-oss-120b is made by OpenAI. Grok 4.5 is made by xAI.