gpt-oss-120b vs Mistral Medium 3.5
Benchmarks, API pricing and specs, head to head. Data updated 2026-06-10.
OpenAI · Aug 2025
OpenAI's open-weights MoE reasoning model under Apache 2.0 — near o4-mini quality, runnable on a single 80GB GPU.
Mistral AI · Mar 2026
Europe's strongest model line: frontier-adjacent quality at $0.40/$2 with EU data residency and on-prem options.
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. On price the gap is dramatic: gpt-oss-120b works out roughly 4.0x cheaper per blended million tokens. 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-oss-120b | Mistral Medium 3.5 | |
|---|---|---|
| modhub Index | — | — |
| Input price / 1M | $0.1 | $0.4 |
| Output price / 1M | $0.5 | $2 |
| Context window | 131K | 131K |
| Max output | 131K | — |
| Open weights | yes (Apache 2.0) | no |
| Reasoning model | yes | no |
| Multimodal input | text | text, image |
| Knowledge cutoff | Jun 2024 | Dec 2025 |
| Released | Aug 2025 | Mar 2026 |
| Example monthly cost* | $1.75 | $7.00 |
* 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-oss-120b or Mistral Medium 3.5?
- These two models don't yet share verified results on the benchmarks we track, so judge them on specs, pricing and intended use. On price the gap is dramatic: gpt-oss-120b works out roughly 4.0x cheaper per blended million tokens. 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-oss-120b or Mistral Medium 3.5?
- gpt-oss-120b costs $0.1/$0.5 per million input/output tokens, while Mistral Medium 3.5 costs $0.4/$2. For a typical workload of 10M input and 1.5M output tokens per month, that's $1.75 versus $7.00.
- Which model is better for coding, gpt-oss-120b or Mistral Medium 3.5?
- We don't yet track SWE-bench Verified results for both models; check their individual pages for coding-related scores.