GPT-5.1 vs Grok 4.5
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Grok 4.5 by xAI wins on 5 of 7 benchmarks against GPT-5.1 by OpenAI, which leads on 2. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from our benchmark data.
Category-by-Category Breakdown
Coding: In coding, Grok 4.5 scores 72.4 on AA Coding Index compared to GPT-5.1's 49.4, while Grok 4.5 scores 1283 on Design Arena ELO compared to GPT-5.1's 1158, while Grok 4.5 scores 1296 on Website Arena ELO compared to GPT-5.1's 1179.
Context: In context, Grok 4.5 scores 500K on Context Length compared to GPT-5.1's 400K.
Pricing Comparison
GPT-5.1 costs $1.3/1M input tokens and $10.0/1M output tokens, while Grok 4.5 costs $2.0/1M input and $6.0/1M output. GPT-5.1 is the more affordable option for API usage.
Verdict
GPT-5.1 leads across the board in affordability, making it the stronger overall choice in this comparison.
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GPT-5.1 vs Grok 4.5 — FAQ
Which is better, GPT-5.1 or Grok 4.5?
Grok 4.5 wins on more benchmarks overall (5 vs 2). However, the best choice depends on your specific needs — each model excels in different areas.
How does GPT-5.1 compare to Grok 4.5 for coding?
SWE-bench Verified data is not available for both models. Check the detailed comparison charts above for other coding-related metrics.
Is GPT-5.1 cheaper than Grok 4.5?
Yes, GPT-5.1 is cheaper. GPT-5.1 costs $1.3/1M input and $10.0/1M output tokens. Grok 4.5 costs $2.0/1M input and $6.0/1M output tokens.
Which is faster, GPT-5.1 or Grok 4.5?
Output speed data is not available for both models. Check the speed section of the comparison above for available performance data.
What benchmarks does the GPT-5.1 vs Grok 4.5 comparison cover?
This comparison covers 7 benchmarks including Input Cost, Output Cost, Context Length, AA Coding Index, Cached Input Cost, Design Arena ELO, Website Arena ELO. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.