GPT-4o mini vs gpt-oss-120b
Benchmarks, API pricing and specs, head to head. Data updated 2026-06-10.
OpenAI · Jul 2024
The 2024 budget classic that defined the cheap-LLM tier; GPT-5 nano and mini have since taken its crown.
OpenAI · Aug 2025
OpenAI's open-weights MoE reasoning model under Apache 2.0 — near o4-mini quality, runnable on a single 80GB GPU.
The verdict
These two models don't yet share verified results on the benchmarks we track, so judge them on specs, pricing and intended use. gpt-oss-120b is about 1.3x cheaper per blended million tokens (3:1 input:output mix). gpt-oss-120b also takes 131K of context versus 128K for GPT-4o mini. And gpt-oss-120b is open-weights (Apache 2.0), so it can be self-hosted — a structural advantage if data control or vendor independence matters.
Specs & pricing
| GPT-4o mini | gpt-oss-120b | |
|---|---|---|
| modhub Index | — | — |
| Input price / 1M | $0.15 | $0.1 |
| Output price / 1M | $0.6 | $0.5 |
| Context window | 128K | 131K |
| Max output | 16K | 131K |
| Open weights | no | yes (Apache 2.0) |
| Reasoning model | no | yes |
| Multimodal input | text, image | text |
| Knowledge cutoff | Oct 2023 | Jun 2024 |
| Released | Jul 2024 | Aug 2025 |
| Example monthly cost* | $2.40 | $1.75 |
* 10M input + 1.5M output tokens per month at list prices, no caching. Green = better value on that row.
Frequently asked questions
- Which is better, GPT-4o mini or gpt-oss-120b?
- These two models don't yet share verified results on the benchmarks we track, so judge them on specs, pricing and intended use. gpt-oss-120b is about 1.3x cheaper per blended million tokens (3:1 input:output mix). gpt-oss-120b also takes 131K of context versus 128K for GPT-4o mini. And gpt-oss-120b is open-weights (Apache 2.0), so it can be self-hosted — a structural advantage if data control or vendor independence matters.
- Which is cheaper, GPT-4o mini or gpt-oss-120b?
- GPT-4o mini costs $0.15/$0.6 per million input/output tokens, while gpt-oss-120b costs $0.1/$0.5. For a typical workload of 10M input and 1.5M output tokens per month, that's $2.40 versus $1.75.
- Which model is better for coding, GPT-4o mini or gpt-oss-120b?
- We don't yet track SWE-bench Verified results for both models; check their individual pages for coding-related scores.