Head to head
Clef scores 81.6 and Kev 4B 76.8 on the System One Index. Clef is more accurate on 11 of 16 text datasets, Kev 4B on 4, and 1 are tied. Same cases, same request, same scorer.
| Clef | Kev 4B | |
|---|---|---|
| System One Index | 81.6 | 76.8 |
| English | 80.6 | 78.3 |
| Arabic | 83.0 | 74.8 |
| Vision Index | 78.1 | – |
| Calibration error | 2.2% | 5.1% |
| Median latency | 310 ms | 552 ms |
| Cost per 1,000 calls | $0.116 | $0.010 |
| Clef | Kev 4B | |
|---|---|---|
| AG News English | 90.5 | 90.5 |
| SST-2 English | 97.0 | 92.5 |
| SST-5 English | 51.5 | 52.0 |
| DAIR Emotion English | 58.5 | 54.5 |
| Banking77 English | 95.5 | 88.0 |
| BoolQ English | 91.0 | 91.5 |
| XNLI English English | 88.7 | 90.7 |
| Typed decisions English | 72.2 | 66.3 |
| XNLI French French | 80.0 | 79.3 |
| XNLI Arabic Arabic | 78.0 | 72.7 |
| MASSIVE scenario Arabic | 88.0 | 57.0 |
| MASSIVE intent Arabic | 89.5 | 76.5 |
| OSACT4 offensive Arabic | 89.5 | 88.5 |
| Tweet sentiment Arabic | 58.0 | 63.0 |
| MIRACL rerank Arabic | 89.0 | 79.5 |
| MIRACL pairwise Arabic | 89.0 | 86.5 |
| Clef | Kev 4B | |
|---|---|---|
| SST-2, as an image | 95.5 | – |
| Arabic sentiment, as an image | 35.0 | – |
| Oxford-IIIT Pet | 82.5 | – |
| VQAv2 yes/no | 87.5 | – |
| CountBench | 90.0 | – |
Model pages: Clef · Kev 4B. Latency for API models is the median per call through OpenRouter, timed from one machine.