Claude Sonnet 4.5 vs GPT-5.4 nano
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
GPT-5.4 nano by OpenAI wins on 5 of 9 benchmarks against Claude Sonnet 4.5 by Anthropic, which leads on 3. 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, both score 21.2 on AA Intelligence Index.
Coding: In coding, GPT-5.4 nano scores 56.1 on AA Coding Index compared to Claude Sonnet 4.5's 52.1.
Reasoning: In reasoning, Claude Sonnet 4.5 scores 82.5% on GPQA Diamond compared to GPT-5.4 nano's 77.9%, while GPT-5.4 nano scores 17.7 on AA Agentic Index compared to Claude Sonnet 4.5's 17.5, while Claude Sonnet 4.5 scores 73.0% on τ²-Bench Airline compared to GPT-5.4 nano's 67.0%.
Context: In context, Claude Sonnet 4.5 scores 1.0M on Context Length compared to GPT-5.4 nano's 400K.
Pricing Comparison
Claude Sonnet 4.5 costs $3.0/1M input tokens and $15.0/1M output tokens, while GPT-5.4 nano costs $0.20/1M input and $1.3/1M output. GPT-5.4 nano is the more affordable option for API usage.
Verdict
GPT-5.4 nano 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 nano — FAQ
Which is better, Claude Sonnet 4.5 or GPT-5.4 nano?
GPT-5.4 nano wins on more benchmarks overall (5 vs 3). 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 nano 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 nano?
Yes, GPT-5.4 nano is cheaper. Claude Sonnet 4.5 costs $3.0/1M input and $15.0/1M output tokens. GPT-5.4 nano costs $0.20/1M input and $1.3/1M output tokens.
Which is faster, Claude Sonnet 4.5 or GPT-5.4 nano?
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 nano comparison cover?
This comparison covers 9 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.