OpenAIGPT-5.4VSxAIGrok 4.20
Our Take
We recommend GPT-5.4 for its clear benchmark advantage, or the 1.9x cheaper Grok 4.20 only if your budget requires optimizing costs for very high-volume pipelines. While GPT-5.4 offers superior reasoning and coding, it carries a moderate price premium. Choose GPT-5.4 for quality, or Grok 4.20 for cost optimization.
▶WHY?
Benchmark Calculations & Evidence:
Coding Benchmarks: Both models were evaluated on the SWE-bench Pro benchmark. GPT-5.4 scored 57.7%, while Grok 4.20 scored 51.8%.
Reasoning Benchmarks: Both models were evaluated on the GPQA Diamond benchmark. GPT-5.4 scored 92.8%, while Grok 4.20 scored 90%.
Cost Efficiency: Grok 4.20 pricing ($2/M input, $6/M output) is 1.9x cheaper than GPT-5.4 ($2.5/M input, $15/M output).
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Benchmarks & Scores
Coding (swe-bench-pro)Winner (+5.9%)
57.7%complex codebases, multi-file repositories, and architectural planning
Reasoning (gpqa-diamond)Winner (+2.8%)
92.8%graduate-level science QA
Cost & Context
Cost (per 1M tokens)
$5.63Input: $2.50 | Output: $15.00Context WindowLarger
1.05M tokensBenchmarks & Scores
Coding (swe-bench-pro)
51.8%complex codebases, multi-file repositories, and architectural planning
Reasoning (gpqa-diamond)
90%graduate-level science QA
Cost & Context
Cost (per 1M tokens)1.9x cheaper
$3.00Input: $2.00 | Output: $6.00Context Window
1.05M tokensFrequently Asked Questions about GPT-5.4 vs Grok 4.20
Grok 4.20 is cheaper than GPT-5.4. Grok 4.20 has a blended cost of $3.00/1M tokens, which is about 1.9x cheaper than GPT-5.4 at $5.63/1M tokens.
GPT-5.4 is better for coding tasks on this benchmark. It scores 57.7% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning) compared to Grok 4.20 which scores 51.8%.
Related Matchups
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