gpt-oss-120b vs grok-4-1-fast

Capability for the money

Not the same tier: gpt-oss-120b leads grok-4-1-fast by 47.9 points on coding (LiveCodeBench), for 1.6× the price. They are level on tool use (τ²-bench), so the premium only pays off on coding work.

1. Following instructions

   extraction, classification, sticking to a format

   IFBench
   gpt-oss-120b69.0%

   grok-4-1-fast36.5%

   gpt-oss-120b +32.5

2. Coding

   writing and fixing code

   LiveCodeBench
   gpt-oss-120b87.8%

   grok-4-1-fast39.9%

   gpt-oss-120b +47.9

3. Tool use

   multi-step agent work against real tools

   τ²-bench
   gpt-oss-120b65.8%

   grok-4-1-fast63.7%

   gpt-oss-120b +2.1

4. Hard reasoning

   graduate-level science and multi-step analysis

   GPQA Diamond
   gpt-oss-120b78.2%

   grok-4-1-fast63.7%

   gpt-oss-120b +14.5

Averaged over the benchmarks both models sat, grok-4-1-fast returns 185.3 points of pass rate per dollar of blended price against 167.1 — 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.