Compare / GPT-5.1 vs grok-4-fast-non-reasoning
GPT-5.1 vs grok-4-fast-non-reasoning
12 results from 3 sources that measured both models. Each row is in the source's own units; there is no overall winner.
| Benchmark | Metric | GPT-5.1 | grok-4-fast-non-reasoning |
|---|---|---|---|
| Artificial Analysisreported | Artificial Analysis Intelligence Indexindex score | 24.7 | 11.1 |
| Artificial Analysisreported | GPQA Diamond% of questions | 87.3% | 60.6% |
| Artificial Analysisreported | Humanity's Last Exam% of questions | 28.5% | 4.5% |
| Artificial Analysisreported | IFBench% of instructions | 72.9% | 37.7% |
| Artificial Analysisreported | Long-context reasoning (AA-LCR)% of questions | 80.0% | 24.0% |
| Artificial Analysisreported | Terminal-Bench Hard% of tasks | 45.5% | 12.1% |
| Artificial Analysisreported | Τ²-bench telecom% of tasks | 81.9% | 63.7% |
| UGI Leaderboardreported | Requested-length error% off the requested word count | 113.0% | 19.0% |
| UGI Leaderboardreported | Style adherencescore from 0 to 1 | 0.38 | 0.33 |
| UGI Leaderboardreported | Writing scorescore out of 100 | 55.8 | 43.0 |
| Vectara Hallucination Leaderboardreported | Answer rate% of documents | 100.0% | 99.2% |
| Vectara Hallucination Leaderboardreported | Hallucination rate% of summaries | 10.9% | 19.7% |
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.