Claude Sonnet 4.5 vs Gemini 2.0 Flash (Reasoning)
Wins 3 of 3 areas
Coding · Reasoning · Images and charts
Wins 0 of 3 areas
—
Claude Sonnet 4.5 is the stronger all-rounder.
Scores updated · 16 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 and images and charts rest on a single test each.
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 Claude Sonnet 4.5 pulls ahead
- Fixes real GitHub issues in Python projectsSWE-bench Verified+63.7points ahead
- Common-sense trick questionsSimpleBench+23.6points ahead
- Graduate-level biology, physics and chemistry questionsGPQA Diamond+9.2points 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 16 tests both models report. The winning score is in its model's colour; marks a score checked independently.
ReasoningClaude Sonnet 4.5
- SimpleBenchClaude Sonnet 4.5 by 23.654.330.7+23.6
- GPQA DiamondClaude Sonnet 4.5 by 9.283.474.2+9.2
Images and chartsClaude Sonnet 4.5
- MMMUClaude Sonnet 4.5 by 4.279.675.4+4.2
Other results12 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.
- AIME 2025Claude Sonnet 4.5 by 59.58727.5+59.5
- swe_bench_bashClaude Sonnet 4.5 by 57.971.413.5+57.9
- HMMT Feb. 2025Claude Sonnet 4.5 by 54.267.513.3+54.2
- LiveCodeBenchClaude Sonnet 4.5 by 35.97135.1+35.9
- HarmBenchClaude Sonnet 4.5 by 25.89266.2+25.8
- AIR-Bench 2024Claude Sonnet 4.5 by 23.689.866.2+23.6
- MRCRGemini 2.0 Flash (Reasoning) by 13.855.469.2+13.8
- MMLU-ProClaude Sonnet 4.5 by 11.187.576.4+11.1
- bbqClaude Sonnet 4.5 by 3.598.995.4+3.5
- simple_safety_testsClaude Sonnet 4.5 by 1.510098.5+1.5
- anthropic_red_teamGemini 2.0 Flash (Reasoning) by 1.298.299.4+1.2
- XSTestClaude Sonnet 4.5 by 1.196.495.3+1.1
Questions people ask
Which is better, Claude Sonnet 4.5 or Gemini 2.0 Flash (Reasoning)?
Claude Sonnet 4.5 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?
Claude Sonnet 4.5. It wins the one coding test both models report.
How do you compare the two?
We use the 16 benchmark tests both models have published scores on. The verdict counts the 4 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 12 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.