Compare / GPT-5.5 vs grok-4-fast
GPT-5.5 vs grok-4-fast
3 results from 2 sources that measured both models. Each row is in the source's own units; there is no overall winner.
| Benchmark | Metric | GPT-5.5 | grok-4-fast |
|---|---|---|---|
| Arena (formerly LMArena)reported | OverallArena rating | 1,224 | 1,160 |
| tau2-benchreported | Consistency (pass^4)% of tasks | 29.9% | 4.1% |
| tau2-benchreported | Task success (pass^1)% of tasks | 44.6% | 15.7% |
Bold green marks the better value on that metric. Where a source reports ranges that overlap, the difference may not be meaningful; see the benchmark page for ranges.