Compare / GPT-5.2 vs grok-4-fast-non-reasoning

GPT-5.2 vs grok-4-fast-non-reasoning

5 results from 2 sources that measured both models. Each row is in the source's own units; there is no overall winner.

GPT-5.2: OpenAI · profile
grok-4-fast-non-reasoning: xAI · profile
Results compared: 5
Shared sources: 2

Benchmark	Metric	GPT-5.2	grok-4-fast-non-reasoning
UGI Leaderboardreported	Requested-length error% off the requested word count	76.0%	19.0%
UGI Leaderboardreported	Style adherencescore from 0 to 1	0.40	0.33
UGI Leaderboardreported	Writing scorescore out of 100	49.4	43.0
Vectara Hallucination Leaderboardreported	Answer rate% of documents	100.0%	99.2%
Vectara Hallucination Leaderboardreported	Hallucination rate% of summaries	8.4%	19.7%

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.