GPT-4.5 vs Grok 4
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Grok 4 by xAI wins on 13 of 14 benchmarks against GPT-4.5 by OpenAI, 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, Grok 4 scores 1430 on Chatbot Arena ELO compared to GPT-4.5's 1310, while Grok 4 scores 87.0% on MMLU-Pro compared to GPT-4.5's 78.0%.
Coding: In coding, Grok 4 scores 90.0% on HumanEval+ compared to GPT-4.5's 88.0%, while Grok 4 scores 72.0% on SWE-bench Verified compared to GPT-4.5's 38.0%, while Grok 4 scores 65.0% on LiveCodeBench compared to GPT-4.5's 45.0%.
Math: In math, Grok 4 scores 91.0% on MATH compared to GPT-4.5's 82.0%, while Grok 4 scores 97.0% on GSM8K compared to GPT-4.5's 94.0%.
Reasoning: In reasoning, Grok 4 scores 87.0% on GPQA Diamond compared to GPT-4.5's 71.4%, while Grok 4 scores 50.0% on ARC-AGI compared to GPT-4.5's 20.0%.
Context: In context, Grok 4 scores 256K on Context Length compared to GPT-4.5's 128K.
Pricing Comparison
GPT-4.5 costs $75.0/1M input tokens and $150.0/1M output tokens, while Grok 4 costs $3.0/1M input and $15.0/1M output. Grok 4 is the more affordable option for API usage.
Speed Comparison
GPT-4.5 generates output at 60 tok/s compared to Grok 4's 55 tok/s, and the time to first token is 600 ms for GPT-4.5 versus 500 ms for Grok 4. GPT-4.5 delivers faster throughput.
Verdict
For developers prioritizing speed, GPT-4.5 has the edge. For those who value coding and general intelligence and math and affordability, Grok 4 is the stronger choice.
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GPT-4.5 vs Grok 4 — FAQ
Which is better, GPT-4.5 or Grok 4?
Grok 4 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-4.5 compare to Grok 4 for coding?
Grok 4 is better for coding, scoring 72.0% on SWE-bench Verified compared to 38.0%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is GPT-4.5 cheaper than Grok 4?
Yes, Grok 4 is cheaper. GPT-4.5 costs $75.0/1M input and $150.0/1M output tokens. Grok 4 costs $3.0/1M input and $15.0/1M output tokens.
Which is faster, GPT-4.5 or Grok 4?
GPT-4.5 is faster, generating output at 60 tok/s compared to 55 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the GPT-4.5 vs Grok 4 comparison cover?
This comparison covers 14 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.