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GPT-5.4 vs Grok 4.1 Fast

Head to head on 25 shared benchmarks, with price, context window, and release dates.

Benchmark scores

46

evals · sort by any column, ⤢ to expand fullscreen

Model
GPT-5.4

OpenAI

65.3%1836elo78.374.8%11.3%48.4%78.5%82.0%77.5%79.3%70.2%82.6%94.1%88.1%82.8%41.3%77.5%68.3%56.0%43.3%47.1%74.0%37.9%67.4%36.0%--13.1%1.4781.0%34.1%9.0%1272elo47.6%87.2%--92063---8652.2%-0.6140.88060.3%
Grok 4.1 Fast

xAI

66.0%1324elo40.163.7%5.1%36.5%80.2%64.7%69.6%52.2%28.2%74.3%83.7%80.2%60.8%28.1%78.7%42.6%4.0%31.3%29.6%73.1%14.4%1.2%63.7%62.0%34.3%--------11.835.0%-39.9%100.0%74.3%-----51.0%
2 / 2 models
AttributeGPT-5.4

OpenAI

Grok 4.1 Fast

xAI

DescriptionGPT-5.4 is an AI model from OpenAI.Grok 4.1 Fast is an AI model from xAI.
FamilyGPTGrok
Params--
Open weightsclosedclosed
Licenseproprietaryproprietary
Released5 Mar 202619 Nov 2025
Context1,050,000-
Input $/1M$2.50-
Output $/1M$15.00-
Cache read $/1M$0.250-
Cache write $/1M--
Speed0 tok/s0 tok/s
Latency0.00 s0.00 s
Modalitiestext, image, filetext
Providers--
PublisherOpenAIxAI
Reported scores
Infraresolutionbench80.2% (150 samples)
Agent Diff Bench62.0% (179 samples)
Medpt100.0% (15 samples)
Hanabi11.8 (15 samples)
SciCode29.6% (AA)

FAQ

Is GPT-5.4 or Grok 4.1 Fast better?
Across the 25 benchmarks both models report on Sophon, GPT-5.4 leads on 21 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
How do GPT-5.4 and Grok 4.1 Fast compare on GPQA Diamond?
GPT-5.4 scores 74.8% and Grok 4.1 Fast scores 63.7% on GPQA Diamond.
When were GPT-5.4 and Grok 4.1 Fast released?
GPT-5.4 was released 5 Mar 2026 by OpenAI. Grok 4.1 Fast was released 19 Nov 2025 by xAI.

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