Claude Sonnet 4.6 vs GPT-5.5
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Claude Sonnet 4.6 by Anthropic and GPT-5.5 by OpenAI are evenly matched across 11 benchmarks. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from our benchmark data.
Category-by-Category Breakdown
General Intelligence: In general intelligence, GPT-5.5 scores 38.6 on AA Intelligence Index compared to Claude Sonnet 4.6's 30.5.
Coding: In coding, GPT-5.5 scores 74.9 on AA Coding Index compared to Claude Sonnet 4.6's 63, while Claude Sonnet 4.6 scores 1274 on Design Arena ELO compared to GPT-5.5's 1272, while Claude Sonnet 4.6 scores 1297 on Website Arena ELO compared to GPT-5.5's 1269.
Reasoning: In reasoning, GPT-5.5 scores 93.8% on GPQA Diamond compared to Claude Sonnet 4.6's 54.3%, while GPT-5.5 scores 37.3 on AA Agentic Index compared to Claude Sonnet 4.6's 33.1, while both score 75.3% on τ²-Bench Airline.
Context: In context, GPT-5.5 scores 1.1M on Context Length compared to Claude Sonnet 4.6's 1.0M.
Pricing Comparison
Claude Sonnet 4.6 costs $3.0/1M input tokens and $15.0/1M output tokens, while GPT-5.5 costs $5.0/1M input and $30.0/1M output. Claude Sonnet 4.6 is the more affordable option for API usage.
Verdict
Claude Sonnet 4.6 leads across the board in affordability, making it the stronger overall choice in this comparison.
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Claude Sonnet 4.6 vs GPT-5.5 — FAQ
Which is better, Claude Sonnet 4.6 or GPT-5.5?
Claude Sonnet 4.6 and GPT-5.5 are evenly matched across benchmarks. The best choice depends on your specific priorities such as coding ability, speed, or pricing.
How does Claude Sonnet 4.6 compare to GPT-5.5 for coding?
SWE-bench Verified data is not available for both models. Check the detailed comparison charts above for other coding-related metrics.
Is Claude Sonnet 4.6 cheaper than GPT-5.5?
Yes, Claude Sonnet 4.6 is cheaper. Claude Sonnet 4.6 costs $3.0/1M input and $15.0/1M output tokens. GPT-5.5 costs $5.0/1M input and $30.0/1M output tokens.
Which is faster, Claude Sonnet 4.6 or GPT-5.5?
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 Claude Sonnet 4.6 vs GPT-5.5 comparison cover?
This comparison covers 11 benchmarks including GPQA Diamond, Input Cost, Output Cost, Context Length, AA Intelligence Index, AA Coding Index, AA Agentic Index, Cached Input Cost, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.