Gemini 2.0 Flash (Reasoning) vs o3
Wins 0 of 3 areas
—
Wins 3 of 3 areas
Coding · Reasoning · Images and charts
o3 is the stronger all-rounder.
Scores updated · 15 tests both models report · How we compare
Where each one wins
Tests won in each of the three areas where both have results. Each piece is one test, so a longer bar means more evidence; grey means the two scored within a point of each other.
Coding rests on a single test.
What it costs
Prices per million tokens, roughly 750,000 words. The bars show the cost of a million tokens read plus a million written.
The biggest differences
The tests each model wins by the widest margin, up to three each. Scores are out of 100.
Where o3 pulls ahead
- Fixes real GitHub issues in Python projectsSWE-bench Verified+55.6points ahead
- Common-sense trick questionsSimpleBench+22.4points ahead
- Graduate-level biology, physics and chemistry questionsGPQA Diamond+8.5points ahead
Where Gemini 2.0 Flash (Reasoning) pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 15 tests both models report. The winning score is in its model's colour; marks a score checked independently.
Reasoningo3
- SimpleBencho3 by 22.430.753.1+22.4
- GPQA Diamondo3 by 8.574.282.7+8.5
Images and chartso3
- MMMUo3 by 7.575.482.9+7.5
- LMArena · Visiono3 by 56 rating points11581214+56 rating
Other results10 tests, not counted
Tests outside the eight areas. They are not counted above: several are summary scores built from other tests, or the same test under another name.
- HMMT Feb. 2025o3 by 64.213.377.5+64.2
- AIME 2025o3 by 58.927.586.4+58.9
- LiveCodeBencho3 by 49.635.184.7+49.6
- HarmBencho3 by 32.266.298.4+32.2
- AIR-Bench 2024o3 by 18.366.284.5+18.3
- MMLU-Proo3 by 8.676.485+8.6
- bbqo3 by 2.595.497.9+2.5
- XSTesto3 by 295.397.3+2
- anthropic_red_teamGemini 2.0 Flash (Reasoning) by 1.199.498.3+1.1
- simple_safety_teststie98.599tie
Questions people ask
Which is better, Gemini 2.0 Flash (Reasoning) or o3?
o3 wins all three areas where both have results: coding, reasoning and images and charts. Gemini 2.0 Flash (Reasoning) wins none.
Which is better for coding?
o3. It wins the one coding test both models report.
How do you compare the two?
We use the 15 benchmark tests both models have published scores on. The verdict counts the 5 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 10 are listed but not counted, because several are summary scores or repeat a test. Each score is the one shown on the model's own page.