Compare / Claude Fable 5 vs grok-4-1-fast-reasoning
Claude Fable 5 vs grok-4-1-fast-reasoning
18 results from 4 sources that measured both models. Each row is in the source's own units; there is no overall winner.
| Benchmark | Metric | Claude Fable 5 | grok-4-1-fast-reasoning |
|---|---|---|---|
| Arena (formerly LMArena)reported | OverallArena rating | 1,483 | 1,413 |
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,503 | 1,417 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,501 | 1,414 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,550 | 1,438 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,509 | 1,401 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,504 | 1,430 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,508 | 1,407 |
| Artificial Analysisreported | Artificial Analysis Intelligence Indexindex score | 49.6 | 20.4 |
| Artificial Analysisreported | GPQA Diamond% of questions | 92.6% | 85.3% |
| Artificial Analysisreported | Humanity's Last Exam% of questions | 55.5% | 19.3% |
| Artificial Analysisreported | IFBench% of instructions | 63.5% | 52.7% |
| Artificial Analysisreported | Long-context reasoning (AA-LCR)% of questions | 82.3% | 74.0% |
| Artificial Analysisreported | Terminal-Bench Hard% of tasks | 62.9% | 24.2% |
| Artificial Analysisreported | Τ²-bench telecom% of tasks | 98.5% | 93.3% |
| UGI Leaderboardreported | Requested-length error% off the requested word count | 2.0% | 7.0% |
| UGI Leaderboardreported | Style adherencescore from 0 to 1 | 0.41 | 0.33 |
| UGI Leaderboardreported | Writing scorescore out of 100 | 74.2 | 51.3 |
| Vending-Bench 2reported | Money after a yearUS dollars | $5,680.26 | $1,106.63 |
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.