GPT-4o mini vs GPT-5.1
Wins 0 of 6 areas
—
Wins 6 of 6 areas
Coding · Agents · Reasoning · Facts · Images and charts · Following instructions
GPT-5.1 is the stronger all-rounder.GPT-4o mini is cheaper.
Scores updated · 20 tests both models report · How we compare
Where each one wins
Tests won in each of the six 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.
- CodingWriting and fixing software03GPT-5.13 of 3 tests
- ReasoningHard problems that need careful thinking03GPT-5.13 of 3 tests
- AgentsCarrying out multi-step tasks on its own02GPT-5.12 of 2 tests
- Images and chartsUnderstanding pictures, charts and video02GPT-5.12 of 2 tests
- FactsGetting facts right instead of making them up01GPT-5.11 of 1 test
- Following instructionsDoing exactly what it is asked01GPT-5.11 of 1 test
Facts and following instructions 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.
GPT-4o mini costs 93% 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-5.1 pulls ahead
- Fixes real GitHub issues in Python projectsSWE-bench Verified+67.6points ahead
- Command-line tasks in a real terminalTerminal-Bench 2.1+46.8points ahead
- Graduate-level biology, physics and chemistry questionsGPQA Diamond+44.7points ahead
Where GPT-4o mini pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 20 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGPT-5.1
- SWE-bench VerifiedGPT-5.1 by 67.68.776.3+67.6
- Terminal-Bench 2.1GPT-5.1 by 46.85.652.4+46.8
- SciCodeGPT-5.1 by 20.422.943.3+20.4
AgentsGPT-5.1
- GDPValGPT-5.1 by 16.5016.5+16.5
- τ-Bench V3 · BankingGPT-5.1 by 132.915.9+13
ReasoningGPT-5.1
- GPQA DiamondGPT-5.1 by 44.742.687.3+44.7
- Humanity's Last ExamGPT-5.1 by 24.34.228.5+24.3
- ARC-AGI-2GPT-5.1 by 17.6017.6+17.6
Images and chartsGPT-5.1
Other results8 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.
- Artificial Analysis Coding IndexGPT-5.1 by 3811.449.4+38
- AIR-Bench 2024GPT-5.1 by 29.956.386.2+29.9
- MMLU-ProGPT-5.1 by 25.361.787+25.3
- AA IntelligenceGPT-5.1 by 186.724.7+18
- HarmBenchGPT-5.1 by 12.784.997.6+12.7
- XSTestGPT-5.1 by 2.29698.2+2.2
- simple_safety_testsGPT-5.1 by 297.899.8+2
- anthropic_red_teamGPT-5.1 by 1.298.399.5+1.2
Questions people ask
Which is better, GPT-4o mini or GPT-5.1?
GPT-5.1 wins all six areas where both have results: coding, agents, reasoning, facts, images and charts and following instructions. GPT-4o mini wins none, but costs 93% less.
Which is better for coding?
GPT-5.1. It wins 3 of the 3 coding tests both models report; GPT-4o mini wins none.
Which is cheaper?
GPT-4o mini costs $0.15 per million input tokens and $0.60 per million output tokens; GPT-5.1 costs $1.25 and $10.00. That makes GPT-4o mini about 93% cheaper for the same work.
How do you compare the two?
We use the 20 benchmark tests both models have published scores on. The verdict counts the 12 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 8 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.