Compare / GPT-5.5 vs grok-4-1-fast-non-reasoning
GPT-5.5 vs grok-4-1-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-5.5 | grok-4-1-fast-non-reasoning |
|---|---|---|---|
| Artificial Analysisreported | Artificial Analysis Intelligence Indexindex score | 38.4 | 11.3 |
| Artificial Analysisreported | GPQA Diamond% of questions | 93.5% | 63.7% |
| Artificial Analysisreported | Humanity's Last Exam% of questions | 45.8% | 5.1% |
| Artificial Analysisreported | IFBench% of instructions | 75.8% | 36.5% |
| Artificial Analysisreported | Long-context reasoning (AA-LCR)% of questions | 84.3% | 31.3% |
| Artificial Analysisreported | Terminal-Bench Hard% of tasks | 60.6% | 14.4% |
| Artificial Analysisreported | Τ²-bench telecom% of tasks | 93.9% | 63.7% |
| UGI Leaderboardreported | Requested-length error% off the requested word count | 13.0% | 10.0% |
| UGI Leaderboardreported | Style adherencescore from 0 to 1 | 0.41 | 0.32 |
| UGI Leaderboardreported | Writing scorescore out of 100 | 69.7 | 41.9 |
| Vectara Hallucination Leaderboardreported | Answer rate% of documents | 100.0% | 98.5% |
| Vectara Hallucination Leaderboardreported | Hallucination rate% of summaries | 9.3% | 17.8% |
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.