GPT-5.1 vs Grok 4
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
GPT-5.1 by OpenAI wins on 13 of 15 benchmarks against Grok 4 by xAI, which leads on 1. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from the AI Value Index.
Category-by-Category Breakdown
General Intelligence: In general intelligence, GPT-5.1 scores 1464 on Chatbot Arena ELO compared to Grok 4's 1430, while Grok 4 scores 87.0% on MMLU-Pro compared to GPT-5.1's 86.0%.
Coding: In coding, GPT-5.1 scores 93.0% on HumanEval+ compared to Grok 4's 90.0%, while GPT-5.1 scores 76.3% on SWE-bench Verified compared to Grok 4's 72.0%, while GPT-5.1 scores 82.0% on LiveCodeBench compared to Grok 4's 65.0%.
Math: In math, GPT-5.1 scores 95.0% on MATH compared to Grok 4's 91.0%, while GPT-5.1 scores 98.5% on GSM8K compared to Grok 4's 97.0%, while GPT-5.1 scores 94.0% on AIME 2025 compared to Grok 4's 93.0%.
Reasoning: In reasoning, GPT-5.1 scores 88.1% on GPQA Diamond compared to Grok 4's 87.0%, while both score 50.0% on ARC-AGI.
Context: In context, GPT-5.1 scores 400K on Context Length compared to Grok 4's 256K.
Pricing Comparison
GPT-5.1 costs $1.3/1M input tokens and $10.0/1M output tokens, while Grok 4 costs $3.0/1M input and $15.0/1M output. GPT-5.1 is the more affordable option for API usage.
Speed Comparison
GPT-5.1 generates output at 95 tok/s compared to Grok 4's 55 tok/s, and the time to first token is 350 ms for GPT-5.1 versus 500 ms for Grok 4. GPT-5.1 delivers faster throughput.
Verdict
GPT-5.1 leads across the board in coding, general intelligence, math, affordability, speed, making it the stronger overall choice in this comparison.
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GPT-5.1 vs Grok 4 — FAQ
Which is better, GPT-5.1 or Grok 4?
GPT-5.1 wins on more benchmarks overall (13 vs 1). However, the best choice depends on your specific needs — each model excels in different areas.
How does GPT-5.1 compare to Grok 4 for coding?
GPT-5.1 is better for coding, scoring 76.3% on SWE-bench Verified compared to 72.0%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is GPT-5.1 cheaper than Grok 4?
Yes, GPT-5.1 is cheaper. GPT-5.1 costs $1.3/1M input and $10.0/1M output tokens. Grok 4 costs $3.0/1M input and $15.0/1M output tokens.
Which is faster, GPT-5.1 or Grok 4?
GPT-5.1 is faster, generating output at 95 tok/s compared to 55 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the GPT-5.1 vs Grok 4 comparison cover?
This comparison covers 15 benchmarks including Chatbot Arena ELO, MMLU-Pro, HumanEval+, MATH, SWE-bench Verified, GPQA Diamond, Output Speed, Time to First Token, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.