Claude Sonnet 4.5 vs GPT-4.5
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Claude Sonnet 4.5 by Anthropic wins on 14 of 15 benchmarks against GPT-4.5 by OpenAI, which leads on 1. 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, Claude Sonnet 4.5 scores 1380 on Chatbot Arena ELO compared to GPT-4.5's 1310, while Claude Sonnet 4.5 scores 83.0% on MMLU-Pro compared to GPT-4.5's 78.0%, while Claude Sonnet 4.5 scores 88.0% on IFEval compared to GPT-4.5's 86.0%.
Coding: In coding, Claude Sonnet 4.5 scores 90.0% on HumanEval+ compared to GPT-4.5's 88.0%, while Claude Sonnet 4.5 scores 77.2% on SWE-bench Verified compared to GPT-4.5's 38.0%, while Claude Sonnet 4.5 scores 62.0% on LiveCodeBench compared to GPT-4.5's 45.0%.
Math: In math, Claude Sonnet 4.5 scores 87.0% on MATH compared to GPT-4.5's 82.0%, while Claude Sonnet 4.5 scores 95.5% on GSM8K compared to GPT-4.5's 94.0%.
Reasoning: In reasoning, Claude Sonnet 4.5 scores 83.4% on GPQA Diamond compared to GPT-4.5's 71.4%, while Claude Sonnet 4.5 scores 45.0% on ARC-AGI compared to GPT-4.5's 20.0%.
Context: In context, Claude Sonnet 4.5 scores 1.0M on Context Length compared to GPT-4.5's 128K.
Pricing Comparison
Claude Sonnet 4.5 costs $3.0/1M input tokens and $15.0/1M output tokens, while GPT-4.5 costs $75.0/1M input and $150.0/1M output. Claude Sonnet 4.5 is the more affordable option for API usage.
Speed Comparison
Claude Sonnet 4.5 generates output at 67 tok/s compared to GPT-4.5's 60 tok/s, and the time to first token is 1170 ms for Claude Sonnet 4.5 versus 600 ms for GPT-4.5. Claude Sonnet 4.5 delivers faster throughput.
Verdict
Claude Sonnet 4.5 leads across the board in coding, general intelligence, math, affordability, speed, making it the stronger overall choice in this comparison.
View Individual Model Pages
Claude Sonnet 4.5 vs GPT-4.5 — FAQ
Which is better, Claude Sonnet 4.5 or GPT-4.5?
Claude Sonnet 4.5 wins on more benchmarks overall (14 vs 1). However, the best choice depends on your specific needs — each model excels in different areas.
How does Claude Sonnet 4.5 compare to GPT-4.5 for coding?
Claude Sonnet 4.5 is better for coding, scoring 77.2% on SWE-bench Verified compared to 38.0%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Claude Sonnet 4.5 cheaper than GPT-4.5?
Yes, Claude Sonnet 4.5 is cheaper. Claude Sonnet 4.5 costs $3.0/1M input and $15.0/1M output tokens. GPT-4.5 costs $75.0/1M input and $150.0/1M output tokens.
Which is faster, Claude Sonnet 4.5 or GPT-4.5?
Claude Sonnet 4.5 is faster, generating output at 67 tok/s compared to 60 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Claude Sonnet 4.5 vs GPT-4.5 comparison cover?
This comparison covers 15 benchmarks including Chatbot Arena ELO, MMLU-Pro, HumanEval+, IFEval, MATH, GPQA Diamond, SWE-bench Verified, Output Speed, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.