GPT-5.5 vs Grok 4
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
GPT-5.5 by OpenAI wins on 4 of 6 benchmarks against Grok 4 by xAI, 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, GPT-5.5 scores 1272 on Design Arena ELO compared to Grok 4's 1073, while GPT-5.5 scores 1269 on Website Arena ELO compared to Grok 4's 1056.
Reasoning: In reasoning, GPT-5.5 scores 93.8% on GPQA Diamond compared to Grok 4's 87.0%.
Context: In context, GPT-5.5 scores 1.1M on Context Length compared to Grok 4's 256K.
Pricing Comparison
GPT-5.5 costs $5.0/1M input tokens and $30.0/1M 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.
Verdict
Grok 4 leads across the board in affordability, making it the stronger overall choice in this comparison.
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GPT-5.5 vs Grok 4 — FAQ
Which is better, GPT-5.5 or Grok 4?
GPT-5.5 wins on more benchmarks overall (4 vs 2). However, the best choice depends on your specific needs — each model excels in different areas.
How does GPT-5.5 compare to Grok 4 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-5.5 cheaper than Grok 4?
Yes, Grok 4 is cheaper. GPT-5.5 costs $5.0/1M input and $30.0/1M output tokens. Grok 4 costs $3.0/1M input and $15.0/1M output tokens.
Which is faster, GPT-5.5 or Grok 4?
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-5.5 vs Grok 4 comparison cover?
This comparison covers 6 benchmarks including GPQA Diamond, Input Cost, Output Cost, Context Length, Design Arena ELO, Website Arena ELO. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.