Claude Opus 4.5 vs GPT-4.5
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Claude Opus 4.5 by Anthropic wins on 13 of 15 benchmarks against GPT-4.5 by OpenAI, 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
General Intelligence: In general intelligence, Claude Opus 4.5 scores 1468 on Chatbot Arena ELO compared to GPT-4.5's 1310, while Claude Opus 4.5 scores 89.5% on MMLU-Pro compared to GPT-4.5's 78.0%, while Claude Opus 4.5 scores 90.0% on IFEval compared to GPT-4.5's 86.0%.
Coding: In coding, Claude Opus 4.5 scores 92.0% on HumanEval+ compared to GPT-4.5's 88.0%, while Claude Opus 4.5 scores 80.9% on SWE-bench Verified compared to GPT-4.5's 38.0%, while Claude Opus 4.5 scores 70.0% on LiveCodeBench compared to GPT-4.5's 45.0%.
Math: In math, Claude Opus 4.5 scores 90.0% on MATH compared to GPT-4.5's 82.0%, while Claude Opus 4.5 scores 96.5% on GSM8K compared to GPT-4.5's 94.0%.
Reasoning: In reasoning, Claude Opus 4.5 scores 87.0% on GPQA Diamond compared to GPT-4.5's 71.4%, while Claude Opus 4.5 scores 57.0% on ARC-AGI compared to GPT-4.5's 20.0%.
Context: In context, Claude Opus 4.5 scores 200K on Context Length compared to GPT-4.5's 128K.
Pricing Comparison
Claude Opus 4.5 costs $5.0/1M input tokens and $25.0/1M output tokens, while GPT-4.5 costs $75.0/1M input and $150.0/1M output. Claude Opus 4.5 is the more affordable option for API usage.
Speed Comparison
Claude Opus 4.5 generates output at 50 tok/s compared to GPT-4.5's 60 tok/s, and the time to first token is 1700 ms for Claude Opus 4.5 versus 600 ms for GPT-4.5. GPT-4.5 delivers faster throughput.
Verdict
For developers prioritizing coding and general intelligence and math and affordability, Claude Opus 4.5 has the edge. For those who value speed, GPT-4.5 is the stronger choice.
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Claude Opus 4.5 vs GPT-4.5 — FAQ
Which is better, Claude Opus 4.5 or GPT-4.5?
Claude Opus 4.5 wins on more benchmarks overall (13 vs 2). However, the best choice depends on your specific needs — each model excels in different areas.
How does Claude Opus 4.5 compare to GPT-4.5 for coding?
Claude Opus 4.5 is better for coding, scoring 80.9% on SWE-bench Verified compared to 38.0%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Claude Opus 4.5 cheaper than GPT-4.5?
Yes, Claude Opus 4.5 is cheaper. Claude Opus 4.5 costs $5.0/1M input and $25.0/1M output tokens. GPT-4.5 costs $75.0/1M input and $150.0/1M output tokens.
Which is faster, Claude Opus 4.5 or GPT-4.5?
GPT-4.5 is faster, generating output at 60 tok/s compared to 50 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Claude Opus 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.