Compare / Claude Opus 4.5 vs grok-4-1-fast-non-reasoning
Claude Opus 4.5 vs grok-4-1-fast-non-reasoning
13 results from 3 sources that measured both models. Each row is in the source's own units; there is no overall winner.
| Benchmark | Metric | Claude Opus 4.5 | grok-4-1-fast-non-reasoning |
|---|---|---|---|
| Berkeley Function Calling Leaderboard (BFCL) V4reported | Irrelevance detection% correct | 90.8% | 74.1% |
| Berkeley Function Calling Leaderboard (BFCL) V4reported | Memory% correct | 73.8% | 26.2% |
| Berkeley Function Calling Leaderboard (BFCL) V4reported | Multi-turn tasks% correct | 68.4% | 46.8% |
| Berkeley Function Calling Leaderboard (BFCL) V4reported | Overall accuracy% correct | 77.5% | 58.3% |
| Berkeley Function Calling Leaderboard (BFCL) V4reported | Relevance detection% correct | 68.8% | 81.2% |
| Berkeley Function Calling Leaderboard (BFCL) V4reported | Single-turn calls (curated)% correct | 89.7% | 88.1% |
| Berkeley Function Calling Leaderboard (BFCL) V4reported | Single-turn calls (user-contributed)% correct | 79.8% | 77.9% |
| Berkeley Function Calling Leaderboard (BFCL) V4reported | Web search% correct | 84.5% | 75.0% |
| UGI Leaderboardreported | Requested-length error% off the requested word count | 3.0% | 10.0% |
| UGI Leaderboardreported | Style adherencescore from 0 to 1 | 0.39 | 0.32 |
| UGI Leaderboardreported | Writing scorescore out of 100 | 70.4 | 41.9 |
| Vectara Hallucination Leaderboardreported | Answer rate% of documents | 98.7% | 98.5% |
| Vectara Hallucination Leaderboardreported | Hallucination rate% of summaries | 10.9% | 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.