token.app › Compare › GPT-4o-mini vs gpt-oss-20b
GPT-4o-mini vs gpt-oss-20b
gpt-oss-20b leads on 2 of 2 shared benchmarks. gpt-oss-20b is 7.3× cheaper per token on a blended 3:1 basis. gpt-oss-20b accepts the larger context window (131K).
Head to head
Blended price uses a 3:1 input:output mix
| GPT-4o-mini | gpt-oss-20b | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Input $/1M | $0.150 | $0.018 |
| Output $/1M | $0.600 | $0.090 |
| Blended $/1M | $0.262 | $0.036 |
| Context window | 128K | 131K |
| Max output | 16K | 33K |
| Released | Jul 2024 | Aug 2025 |
| Licence | Proprietary | Open weights |
| GPQA Diamond | 37.7% | 60.8% |
| OTIS Mock AIME | 6.9% | 65.3% |
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-mini if…
- No clear advantage on the data we hold.
Choose gpt-oss-20b if…
- Costs less per token — $0.036 vs $0.262 blended
- Higher GPQA Diamond (60.8% vs 37.7%)
- Higher OTIS Mock AIME (65.3% vs 6.9%)
- Larger context window (131K)
- Open weights — self-hostable
- Newer model (released Aug 2025)
FAQ
Which is better, GPT-4o-mini or gpt-oss-20b?
Across the 2 benchmarks both models have independently-run scores for, GPT-4o-mini leads on 0 and gpt-oss-20b leads on 2. Benchmarks are one input — price and context window are on this page too.
Is GPT-4o-mini cheaper than gpt-oss-20b?
gpt-oss-20b is cheaper: $0.036 versus $0.262 per million tokens blended at 3:1 input:output. Input alone: $0.150 vs $0.018. Output alone: $0.600 vs $0.090.
What context windows do GPT-4o-mini and gpt-oss-20b have?
GPT-4o-mini: 128,000 tokens. gpt-oss-20b: 131,072 tokens.
Who makes GPT-4o-mini and gpt-oss-20b?
GPT-4o-mini is made by OpenAI. gpt-oss-20b is made by OpenAI.