GPT-5.1 vs o1
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
GPT-5.1 by OpenAI wins on 17 of 18 benchmarks against o1 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, GPT-5.1 scores 1464 on Chatbot Arena ELO compared to o1's 1360, while GPT-5.1 scores 86.0% on MMLU-Pro compared to o1's 82.0%, while o1 scores 92.0% on IFEval compared to GPT-5.1's 91.0%.
Coding: In coding, GPT-5.1 scores 93.0% on HumanEval+ compared to o1's 89.0%, while GPT-5.1 scores 76.3% on SWE-bench Verified compared to o1's 48.9%, while GPT-5.1 scores 82.0% on LiveCodeBench compared to o1's 55.0%, while GPT-5.1 scores 49.4 on AA Coding Index compared to o1's 39.7.
Math: In math, GPT-5.1 scores 95.0% on MATH compared to o1's 94.8%, while GPT-5.1 scores 98.5% on GSM8K compared to o1's 97.5%, while GPT-5.1 scores 94.0% on AIME 2025 compared to o1's 74.0%.
Reasoning: In reasoning, GPT-5.1 scores 88.1% on GPQA Diamond compared to o1's 77.3%, while GPT-5.1 scores 50.0% on ARC-AGI compared to o1's 32.0%.
Context: In context, GPT-5.1 scores 400K on Context Length compared to o1's 200K.
Pricing Comparison
GPT-5.1 costs $1.3/1M input tokens and $10.0/1M output tokens, while o1 costs $15.0/1M input and $60.0/1M output. GPT-5.1 is the more affordable option for API usage.
Speed Comparison
GPT-5.1 generates output at 95 tok/s compared to o1's 35 tok/s, and the time to first token is 350 ms for GPT-5.1 versus 1000 ms for o1. GPT-5.1 delivers faster throughput.
Verdict
GPT-5.1 leads across the board in coding, general intelligence, math, affordability, speed, making it the stronger overall choice in this comparison.
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GPT-5.1 vs o1 — FAQ
Which is better, GPT-5.1 or o1?
GPT-5.1 wins on more benchmarks overall (17 vs 1). However, the best choice depends on your specific needs — each model excels in different areas.
How does GPT-5.1 compare to o1 for coding?
GPT-5.1 is better for coding, scoring 76.3% on SWE-bench Verified compared to 48.9%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is GPT-5.1 cheaper than o1?
Yes, GPT-5.1 is cheaper. GPT-5.1 costs $1.3/1M input and $10.0/1M output tokens. o1 costs $15.0/1M input and $60.0/1M output tokens.
Which is faster, GPT-5.1 or o1?
GPT-5.1 is faster, generating output at 95 tok/s compared to 35 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the GPT-5.1 vs o1 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.