GPT-5.1 vs o3 Pro
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
GPT-5.1 by OpenAI wins on 10 of 15 benchmarks against o3 Pro by OpenAI, which leads on 4. 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 o3 Pro's 1410, while both score 86.0% on MMLU-Pro.
Coding: In coding, GPT-5.1 scores 93.0% on HumanEval+ compared to o3 Pro's 92.0%, while GPT-5.1 scores 76.3% on SWE-bench Verified compared to o3 Pro's 70.0%, while GPT-5.1 scores 82.0% on LiveCodeBench compared to o3 Pro's 75.0%.
Math: In math, o3 Pro scores 97.0% on MATH compared to GPT-5.1's 95.0%, while o3 Pro scores 99.0% on GSM8K compared to GPT-5.1's 98.5%, while o3 Pro scores 98.4% on AIME 2025 compared to GPT-5.1's 94.0%.
Reasoning: In reasoning, GPT-5.1 scores 88.1% on GPQA Diamond compared to o3 Pro's 85.0%, while o3 Pro scores 70.0% on ARC-AGI compared to GPT-5.1's 50.0%.
Context: In context, GPT-5.1 scores 400K on Context Length compared to o3 Pro's 200K.
Pricing Comparison
GPT-5.1 costs $1.3/1M input tokens and $10.0/1M output tokens, while o3 Pro costs $20.0/1M input and $80.0/1M 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 o3 Pro's 25 tok/s, and the time to first token is 350 ms for GPT-5.1 versus 1200 ms for o3 Pro. GPT-5.1 delivers faster throughput.
Verdict
For developers prioritizing coding and general intelligence and affordability and speed, GPT-5.1 has the edge. For those who value math, o3 Pro is the stronger choice.
View Individual Model Pages
GPT-5.1 vs o3 Pro — FAQ
Which is better, GPT-5.1 or o3 Pro?
GPT-5.1 wins on more benchmarks overall (10 vs 4). However, the best choice depends on your specific needs — each model excels in different areas.
How does GPT-5.1 compare to o3 Pro for coding?
GPT-5.1 is better for coding, scoring 76.3% on SWE-bench Verified compared to 70.0%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is GPT-5.1 cheaper than o3 Pro?
Yes, GPT-5.1 is cheaper. GPT-5.1 costs $1.3/1M input and $10.0/1M output tokens. o3 Pro costs $20.0/1M input and $80.0/1M output tokens.
Which is faster, GPT-5.1 or o3 Pro?
GPT-5.1 is faster, generating output at 95 tok/s compared to 25 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the GPT-5.1 vs o3 Pro comparison cover?
This comparison covers 15 benchmarks including Chatbot Arena ELO, MMLU-Pro, HumanEval+, MATH, GPQA Diamond, SWE-bench Verified, Output Speed, LiveCodeBench, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.