Claude Opus 4.5 vs GPT-5.1
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
GPT-5.1 by OpenAI wins on 13 of 18 benchmarks against Claude Opus 4.5 by Anthropic, which leads on 5. 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-5.1's 1464, while Claude Opus 4.5 scores 89.5% on MMLU-Pro compared to GPT-5.1's 86.0%, while GPT-5.1 scores 91.0% on IFEval compared to Claude Opus 4.5's 90.0%.
Coding: In coding, GPT-5.1 scores 93.0% on HumanEval+ compared to Claude Opus 4.5's 92.0%, while Claude Opus 4.5 scores 80.9% on SWE-bench Verified compared to GPT-5.1's 76.3%, while GPT-5.1 scores 82.0% on LiveCodeBench compared to Claude Opus 4.5's 70.0%, while Claude Opus 4.5 scores 70.0% on BFCL compared to GPT-5.1's 59.2%.
Math: In math, GPT-5.1 scores 95.0% on MATH compared to Claude Opus 4.5's 90.0%, while GPT-5.1 scores 98.5% on GSM8K compared to Claude Opus 4.5's 96.5%, while GPT-5.1 scores 94.0% on AIME 2025 compared to Claude Opus 4.5's 72.0%.
Reasoning: In reasoning, GPT-5.1 scores 88.1% on GPQA Diamond compared to Claude Opus 4.5's 87.0%, while Claude Opus 4.5 scores 57.0% on ARC-AGI compared to GPT-5.1's 50.0%.
Context: In context, GPT-5.1 scores 400K on Context Length compared to Claude Opus 4.5's 200K.
Pricing Comparison
Claude Opus 4.5 costs $5.0/1M input tokens and $25.0/1M output tokens, while GPT-5.1 costs $1.3/1M input and $10.0/1M output. GPT-5.1 is the more affordable option for API usage.
Speed Comparison
Claude Opus 4.5 generates output at 50 tok/s compared to GPT-5.1's 95 tok/s, and the time to first token is 1700 ms for Claude Opus 4.5 versus 350 ms for GPT-5.1. GPT-5.1 delivers faster throughput.
Verdict
For developers prioritizing coding and general intelligence, Claude Opus 4.5 has the edge. For those who value math and affordability and speed, GPT-5.1 is the stronger choice.
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Claude Opus 4.5 vs GPT-5.1 — FAQ
Which is better, Claude Opus 4.5 or GPT-5.1?
GPT-5.1 wins on more benchmarks overall (13 vs 5). However, the best choice depends on your specific needs — each model excels in different areas.
How does Claude Opus 4.5 compare to GPT-5.1 for coding?
Claude Opus 4.5 is better for coding, scoring 80.9% on SWE-bench Verified compared to 76.3%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Claude Opus 4.5 cheaper than GPT-5.1?
Yes, GPT-5.1 is cheaper. Claude Opus 4.5 costs $5.0/1M input and $25.0/1M output tokens. GPT-5.1 costs $1.3/1M input and $10.0/1M output tokens.
Which is faster, Claude Opus 4.5 or GPT-5.1?
GPT-5.1 is faster, generating output at 95 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-5.1 comparison cover?
This comparison covers 18 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.