GPT-4o mini vs gpt-oss-120b
OpenAI GPT-4o mini | OpenAI gpt-oss-120b | |
|---|---|---|
| Overview | ||
| Company | OpenAI | OpenAI |
| Release date | Jul 18 2024 | Aug 5 2025 |
| Access | Proprietary | Open Weight |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 2% | 11%Best |
| Timeline | ||
| Release gap | GPT-4o mini shipped 383 days before gpt-oss-120b | |
Which is better: GPT-4o mini or gpt-oss-120b?
gpt-oss-120b leads GPT-4o mini on 1 of the 1 benchmark they both report (BullshitBench v2). GPT-4o mini shipped 383 days before gpt-oss-120b, so benchmark comparisons should account for the intervening progress.
GPT-4o mini is proprietary, while gpt-oss-120b is open weight.
On BullshitBench v2, gpt-oss-120b leads at 11% vs GPT-4o mini at 2%.
Frequently asked questions
GPT-4o mini was released by OpenAI on Jul 18 2024.
gpt-oss-120b was released by OpenAI on Aug 5 2025.
GPT-4o mini is a proprietary model released by OpenAI. gpt-oss-120b is an open weight model released by OpenAI.
Other comparisons
GPT-4o mini vs Claude Sonnet 5gpt-oss-120b vs Claude Sonnet 5GPT-4o mini vs Gemini Omnigpt-oss-120b vs Gemini OmniGPT-4o mini vs Muse Spark 1.1gpt-oss-120b vs Muse Spark 1.1GPT-4o mini vs Grok 4.5gpt-oss-120b vs Grok 4.5GPT-4o mini vs DeepSeek-V4-Progpt-oss-120b vs DeepSeek-V4-ProGPT-4o mini vs Mistral Medium 3.5gpt-oss-120b vs Mistral Medium 3.5