Claude 3.5 Sonnet vs GPT-5.2
Wins 0 of 4 areas
—
Wins 4 of 4 areas
Coding · Reasoning · Images and charts · Long documents
GPT-5.2 is the stronger all-rounder.
Scores updated · 19 tests both models report · How we compare
Where each one wins
Tests won in each of the four 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.
Long documents 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.
GPT-5.2 costs 13% less for the same work.
The biggest differences
The tests each model wins by the widest margin, up to three each. Scores are out of 100.
Where GPT-5.2 pulls ahead
- Very hard expert questions across many subjectsHumanity's Last Exam+34.5points ahead
- Graduate-level biology, physics and chemistry questionsGPQA Diamond+34.3points ahead
- Fixes real GitHub issues in Python projectsSWE-bench Verified+31points ahead
Where Claude 3.5 Sonnet pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 19 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGPT-5.2
- SWE-bench VerifiedGPT-5.2 by 314980+31
- SciCodeGPT-5.2 by 20.531.652.1+20.5
ReasoningGPT-5.2
- Humanity's Last ExamGPT-5.2 by 34.53.237.7+34.5
- GPQA DiamondGPT-5.2 by 34.35690.3+34.3
- SimpleBenchGPT-5.2 by 18.327.545.8+18.3
Images and chartsGPT-5.2
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. 2025GPT-5.2 by 98.31.7100+98.3
- AIME 2025GPT-5.2 by 96.73.3100+96.7
- LiveCodeBenchGPT-5.2 by 56.232.889+56.2
- metr_hcastGPT-5.2 by 36.340.777+36.3
- metr_re_benchGPT-5.2 by 30535+30
- AA IntelligenceGPT-5.2 by 23.27.230.4+23.2
- Artificial Analysis Coding IndexGPT-5.2 by 22.72648.7+22.7
- frontiermath_tier_4_v1GPT-5.2 by 18.8018.8+18.8
- MMLU-ProGPT-5.2 by 9.177.686.7+9.1
- metr_swaatie98.799.6tie
Questions people ask
Which is better, Claude 3.5 Sonnet or GPT-5.2?
GPT-5.2 wins all four areas where both have results: coding, reasoning, images and charts and long documents. Claude 3.5 Sonnet wins none.
Which is better for coding?
GPT-5.2. It wins 2 of the 2 coding tests both models report; Claude 3.5 Sonnet wins none.
Which is cheaper?
Claude 3.5 Sonnet costs $3.00 per million input tokens and $15.00 per million output tokens; GPT-5.2 costs $1.75 and $14.00. That makes GPT-5.2 about 13% cheaper for the same work.
How do you compare the two?
We use the 19 benchmark tests both models have published scores on. The verdict counts the 9 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.