Gemini 2.5 Flash vs o1
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
o1 by OpenAI wins on 9 of 15 benchmarks against Gemini 2.5 Flash by Google, which leads on 6. 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, o1 scores 1360 on Chatbot Arena ELO compared to Gemini 2.5 Flash's 1320, while o1 scores 82.0% on MMLU-Pro compared to Gemini 2.5 Flash's 73.0%.
Coding: In coding, o1 scores 89.0% on HumanEval+ compared to Gemini 2.5 Flash's 82.0%, while o1 scores 48.9% on SWE-bench Verified compared to Gemini 2.5 Flash's 38.0%, while o1 scores 55.0% on LiveCodeBench compared to Gemini 2.5 Flash's 42.0%.
Math: In math, o1 scores 94.8% on MATH compared to Gemini 2.5 Flash's 76.0%, while o1 scores 97.5% on GSM8K compared to Gemini 2.5 Flash's 91.0%.
Reasoning: In reasoning, o1 scores 77.3% on GPQA Diamond compared to Gemini 2.5 Flash's 48.0%, while o1 scores 32.0% on ARC-AGI compared to Gemini 2.5 Flash's 25.0%.
Context: In context, Gemini 2.5 Flash scores 1.0M on Context Length compared to o1's 200K.
Pricing Comparison
Gemini 2.5 Flash costs $0.30/1M input tokens and $2.5/1M output tokens, while o1 costs $15.0/1M input and $60.0/1M output. Gemini 2.5 Flash is the more affordable option for API usage.
Speed Comparison
Gemini 2.5 Flash generates output at 251 tok/s compared to o1's 35 tok/s, and the time to first token is 410 ms for Gemini 2.5 Flash versus 1000 ms for o1. Gemini 2.5 Flash delivers faster throughput.
Verdict
For developers prioritizing affordability and speed, Gemini 2.5 Flash has the edge. For those who value coding and general intelligence and math, o1 is the stronger choice.
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Gemini 2.5 Flash vs o1 — FAQ
Which is better, Gemini 2.5 Flash or o1?
o1 wins on more benchmarks overall (9 vs 6). However, the best choice depends on your specific needs — each model excels in different areas.
How does Gemini 2.5 Flash compare to o1 for coding?
o1 is better for coding, scoring 48.9% on SWE-bench Verified compared to 38.0%. SWE-bench tests real-world software engineering by resolving actual GitHub issues.
Is Gemini 2.5 Flash cheaper than o1?
Yes, Gemini 2.5 Flash is cheaper. Gemini 2.5 Flash costs $0.30/1M input and $2.5/1M output tokens. o1 costs $15.0/1M input and $60.0/1M output tokens.
Which is faster, Gemini 2.5 Flash or o1?
Gemini 2.5 Flash is faster, generating output at 251 tok/s compared to 35 tok/s. Faster output speed means shorter wait times for API responses.
What benchmarks does the Gemini 2.5 Flash vs o1 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.