gpt-oss-120b vs mistral-large-3

Capability for the money

gpt-oss-120b is 1.7× cheaper than mistral-large-3 and scores higher on every benchmark they share — there is no case for paying more here.

1. Following instructions

   extraction, classification, sticking to a format

   IFBench
   gpt-oss-120b69.0%

   mistral-large-336.2%

   gpt-oss-120b +32.8

2. Coding

   writing and fixing code

   LiveCodeBench
   gpt-oss-120b87.8%

   mistral-large-346.5%

   gpt-oss-120b +41.3

3. Tool use

   multi-step agent work against real tools

   τ²-bench
   gpt-oss-120b65.8%

   mistral-large-324.6%

   gpt-oss-120b +41.2

4. Hard reasoning

   graduate-level science and multi-step analysis

   GPQA Diamond
   gpt-oss-120b78.2%

   mistral-large-368.0%

   gpt-oss-120b +10.2

Averaged over the benchmarks both models sat, gpt-oss-120b returns 167.1 points of pass rate per dollar of blended price against 58.4 — the ratio that decides whether the dearer model earns its rate.

Each figure is a pass rate: the share of that test set the model answered correctly, measured by a third party rather than self-reported by the lab. Rows are different tests of different difficulty, so compare a model against the other model, not one row against the next. And a benchmark is not your workload — it narrows the shortlist, it does not pick for you.