1,413
Overall · rank 120 of 177
- Unit
- Arena rating, higher is better
- Range
- 1,410 to 1,416
- Sample
- 56513 votes
- Configuration
- grok-4-1-fast-reasoning
- Measured
- 25 Sep 2026
- Not shown
- Not an error rate: claims that cannot be checked on the web are skipped, and preference still carries most of the weight.
1,417
Business, management and finance · rank 106 of 402
- Unit
- Arena rating, higher is better
- Range
- 1,411 to 1,423
- Sample
- 11041 votes
- Configuration
- grok-4-1-fast-reasoning
- Measured
- 25 Sep 2026
- Not shown
- Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
1,414
Creative writing · rank 68 of 407
- Unit
- Arena rating, higher is better
- Range
- 1,407 to 1,421
- Sample
- 8967 votes
- Configuration
- grok-4-1-fast-reasoning
- Measured
- 25 Sep 2026
- Not shown
- Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
1,438
Expert prompts · rank 98 of 359
- Unit
- Arena rating, higher is better
- Range
- 1,429 to 1,447
- Sample
- 4445 votes
- Configuration
- grok-4-1-fast-reasoning
- Measured
- 25 Sep 2026
- Not shown
- Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
1,401
Instruction following · rank 116 of 409
- Unit
- Arena rating, higher is better
- Range
- 1,396 to 1,407
- Sample
- 17241 votes
- Configuration
- grok-4-1-fast-reasoning
- Measured
- 25 Sep 2026
- Not shown
- Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
1,430
Overall · rank 95 of 409
- Unit
- Arena rating, higher is better
- Range
- 1,427 to 1,433
- Sample
- 57452 votes
- Configuration
- grok-4-1-fast-reasoning
- Measured
- 25 Sep 2026
- Not shown
- Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
1,407
Writing, literature and language · rank 89 of 408
- Unit
- Arena rating, higher is better
- Range
- 1,402 to 1,413
- Sample
- 13366 votes
- Configuration
- grok-4-1-fast-reasoning
- Measured
- 25 Sep 2026
- Not shown
- Not accuracy or correctness: it ranks which answer voters preferred, with answer length and formatting controlled for.
79.4%
Irrelevance detection · rank 60 of 109
- Unit
- % correct, higher is better
- Configuration
- grok-4-1-fast-reasoning
- Measured
- 16 Dec 2025
- Not shown
- Not general refusal or safety behaviour.
54.0%
Memory · rank 9 of 109
- Unit
- % correct, higher is better
- Configuration
- grok-4-1-fast-reasoning
- Measured
- 16 Dec 2025
- Not shown
- Not long-term personal memory in a product: sessions are BFCL's scripted ones.
58.9%
Multi-turn tasks · rank 11 of 109
- Unit
- % correct, higher is better
- Configuration
- grok-4-1-fast-reasoning
- Measured
- 16 Dec 2025
- Not shown
- Not open-ended agent work: the tools and tasks are BFCL's simulated APIs.
69.6%
Overall accuracy · rank 5 of 109
- Unit
- % correct, higher is better
- Configuration
- grok-4-1-fast-reasoning
- Measured
- 16 Dec 2025
- Not shown
- Not a neutral average: the weighting is BFCL's. Not reliability on your own tools: BFCL's functions and queries are a fixed test set, and a correct call is judged by its form, not by what it achieved.
81.2%
Relevance detection · rank 41 of 109
- Unit
- % correct, higher is better
- Configuration
- grok-4-1-fast-reasoning
- Measured
- 16 Dec 2025
- Not shown
- Not whether the call itself was right; only that one was attempted.
88.3%
Single-turn calls (curated) · rank 19 of 109
- Unit
- % correct, higher is better
- Configuration
- grok-4-1-fast-reasoning
- Measured
- 16 Dec 2025
- Not shown
- Not reliability on your own tools: BFCL's functions and queries are a fixed test set, and a correct call is judged by its form, not by what it achieved.
78.5%
Single-turn calls (user-contributed) · rank 25 of 109
- Unit
- % correct, higher is better
- Configuration
- grok-4-1-fast-reasoning
- Measured
- 16 Dec 2025
- Not shown
- Not reliability on your own tools: BFCL's functions and queries are a fixed test set, and a correct call is judged by its form, not by what it achieved.
82.5%
Web search · rank 3 of 109
- Unit
- % correct, higher is better
- Configuration
- grok-4-1-fast-reasoning
- Measured
- 16 Dec 2025
- Not shown
- Not general research quality: questions have short, checkable answers.
7.0%
Requested-length error · rank 48 of 370
- Unit
- % off the requested word count, lower is better
- Configuration
- grok-4-1-fast-reasoning
- Measured
- 19 Nov 2025
- Not shown
- Not other format limits such as character counts or bullet counts.
0.33
Style adherence · rank 249 of 370
- Unit
- score from 0 to 1, higher is better
- Configuration
- grok-4-1-fast-reasoning
- Measured
- 19 Nov 2025
- Not shown
- Not brand voice on your own examples: UGI's prompts are private and lean towards creative writing.
51.3
Writing score · rank 151 of 370
- Unit
- score out of 100, higher is better
- Configuration
- grok-4-1-fast-reasoning
- Measured
- 19 Nov 2025
- Not shown
- Not business copy quality: UGI's prompts are private and lean towards creative writing, and models that often refuse get no score.
99.7%
Answer rate · rank 44 of 108
- Unit
- % of documents, higher is better
- Configuration
- grok-4-1-fast-reasoning
- Measured
- 22 Sep 2026
- Not shown
- Not a quality score: a low rate usually means content filters were triggered, and hallucination rates are measured on answered documents only.
19.2%
Hallucination rate · rank 100 of 108
- Unit
- % of summaries, lower is better
- Configuration
- grok-4-1-fast-reasoning
- Measured
- 22 Sep 2026
- Not shown
- Not errors in open questions or other tasks: only summarisation, judged by Vectara's own model (HHEM-2.3), not by people, on news-style documents rather than your data.
