GPT-5.2 vs o3 Pro
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
GPT-5.2 by OpenAI wins on 11 of 15 benchmarks against o3 Pro by OpenAI, which leads on 2. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from the AI Value Index.
Category-by-Category Breakdown
General Intelligence: In general intelligence, GPT-5.2 scores 1475 on Chatbot Arena ELO compared to o3 Pro's 1410, while o3 Pro scores 86.0% on MMLU-Pro compared to GPT-5.2's 83.0%.
Coding: In coding, GPT-5.2 scores 95.0% on HumanEval+ compared to o3 Pro's 92.0%, while GPT-5.2 scores 80.0% on SWE-bench Verified compared to o3 Pro's 70.0%, while GPT-5.2 scores 80.0% on LiveCodeBench compared to o3 Pro's 75.0%.
Math: In math, both score 97.0% on MATH, while both score 99.0% on GSM8K, while GPT-5.2 scores 100.0% on AIME 2025 compared to o3 Pro's 98.4%.
Reasoning: In reasoning, GPT-5.2 scores 92.4% on GPQA Diamond compared to o3 Pro's 85.0%, while o3 Pro scores 70.0% on ARC-AGI compared to GPT-5.2's 54.2%.
Context: In context, GPT-5.2 scores 400K on Context Length compared to o3 Pro's 200K.
Pricing Comparison
GPT-5.2 costs $1.8/1M input tokens and $14.0/1M output tokens, while o3 Pro costs $20.0/1M input and $80.0/1M output. GPT-5.2 is the more affordable option for API usage.
Speed Comparison
GPT-5.2 generates output at 90 tok/s compared to o3 Pro's 25 tok/s, and the time to first token is 380 ms for GPT-5.2 versus 1200 ms for o3 Pro. GPT-5.2 delivers faster throughput.
Verdict
GPT-5.2 leads across the board in coding, general intelligence, affordability, speed, making it the stronger overall choice in this comparison.
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GPT-5.2 vs o3 Pro — FAQ
Which is better, GPT-5.2 or o3 Pro?
GPT-5.2 wins on more benchmarks overall (11 vs 2). However, the best choice depends on your specific needs — each model excels in different areas.
How does GPT-5.2 compare to o3 Pro for coding?
GPT-5.2 is better for coding, scoring 80.0% on SWE-bench Verified compared to 70.0%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is GPT-5.2 cheaper than o3 Pro?
Yes, GPT-5.2 is cheaper. GPT-5.2 costs $1.8/1M input and $14.0/1M output tokens. o3 Pro costs $20.0/1M input and $80.0/1M output tokens.
Which is faster, GPT-5.2 or o3 Pro?
GPT-5.2 is faster, generating output at 90 tok/s compared to 25 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the GPT-5.2 vs o3 Pro comparison cover?
This comparison covers 15 benchmarks including Chatbot Arena ELO, MMLU-Pro, HumanEval+, MATH, SWE-bench Verified, GPQA Diamond, Output Speed, Time to First Token, and more. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.