Claude Sonnet 4.5 vs GPT-5.4
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
GPT-5.4 by OpenAI wins on 8 of 9 benchmarks against Claude Sonnet 4.5 by Anthropic, which leads on 0. 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-5.4 scores 71.1 on AA Coding Index compared to Claude Sonnet 4.5's 52.1, while GPT-5.4 scores 1201 on Design Arena ELO compared to Claude Sonnet 4.5's 1184, while GPT-5.4 scores 1210 on Website Arena ELO compared to Claude Sonnet 4.5's 1202.
Reasoning: In reasoning, GPT-5.4 scores 90.3% on GPQA Diamond compared to Claude Sonnet 4.5's 82.5%, while GPT-5.4 scores 75.7% on τ²-Bench Airline compared to Claude Sonnet 4.5's 73.0%.
Context: In context, GPT-5.4 scores 1.1M on Context Length compared to Claude Sonnet 4.5's 1.0M.
Pricing Comparison
Claude Sonnet 4.5 costs $3.0/1M input tokens and $15.0/1M output tokens, while GPT-5.4 costs $2.5/1M input and $15.0/1M output. GPT-5.4 is the more affordable option for API usage.
Verdict
GPT-5.4 leads across the board in affordability, making it the stronger overall choice in this comparison.
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Claude Sonnet 4.5 vs GPT-5.4 — FAQ
Which is better, Claude Sonnet 4.5 or GPT-5.4?
GPT-5.4 wins on more benchmarks overall (8 vs 0). However, the best choice depends on your specific needs — each model excels in different areas.
How does Claude Sonnet 4.5 compare to GPT-5.4 for coding?
SWE-bench Verified data is not available for both models. Check the detailed comparison charts above for other coding-related metrics.
Is Claude Sonnet 4.5 cheaper than GPT-5.4?
Yes, GPT-5.4 is cheaper. Claude Sonnet 4.5 costs $3.0/1M input and $15.0/1M output tokens. GPT-5.4 costs $2.5/1M input and $15.0/1M output tokens.
Which is faster, Claude Sonnet 4.5 or GPT-5.4?
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 Claude Sonnet 4.5 vs GPT-5.4 comparison cover?
This comparison covers 9 benchmarks including GPQA Diamond, Input Cost, Output Cost, Context Length, AA Coding Index, Cached Input Cost, Design Arena ELO, τ²-Bench Airline, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.