GPT-5.1 vs Kimi K3
Wins 0 of 6 areas
—
Wins 6 of 6 areas
Coding · Agents · Reasoning · Facts · Images and charts · Long documents
Kimi K3 is the stronger all-rounder.GPT-5.1 is cheaper.
Scores updated · 23 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.
- ReasoningHard problems that need careful thinking05Kimi K35 of 5 tests
- CodingWriting and fixing software03Kimi K33 of 3 tests
- AgentsCarrying out multi-step tasks on its own03Kimi K33 of 3 tests
- FactsGetting facts right instead of making them up12Kimi K32 of 3 tests
- Images and chartsUnderstanding pictures, charts and video01Kimi K31 of 1 test
- Long documentsFinding answers in very long texts01Kimi K31 of 1 test
Images and charts and long documents 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-5.1 costs 38% 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 Kimi K3 pulls ahead
- Abstract visual puzzles that people can solveARC-AGI-2+42.8points ahead
- Finds hard-to-locate facts by browsing the webBrowseComp+40.4points ahead
- Real work tasks from 44 professionsGDPVal+35.2points ahead
Where GPT-5.1 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+1.3points ahead
Every test, side by side
All 23 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingKimi K3
- Terminal-Bench 2.1Kimi K3 by 32.652.485+32.6
- LMArena · WebDevKimi K3 by 260 rating points13951655+260 rating
- SciCodeKimi K3 by 16.243.359.5+16.2
AgentsKimi K3
- BrowseCompKimi K3 by 40.450.891.2+40.4
- GDPValKimi K3 by 35.216.551.7+35.2
- τ-Bench V3 · BankingKimi K3 by 30.115.946+30.1
ReasoningKimi K3
- ARC-AGI-2Kimi K3 by 42.817.660.4+42.8
- CritPtKimi K3 by 18.54.923.4+18.5
- Humanity's Last ExamKimi K3 by 18.428.546.9+18.4
- SimpleBenchKimi K3 by 7.553.260.7+7.5
- GPQA DiamondKimi K3 by 6.287.393.5+6.2
FactsKimi K3
- AA-Omniscience · AccuracyKimi K3 by 9.937.747.6+9.9
- SimpleQA VerifiedKimi K3 by 2.64850.6+2.6
- AA-Omniscience · Non-hallucinationGPT-5.1 by 1.348.146.8+1.3
Other results7 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.
- AA Agentic IndexKimi K3 by 2921.650.6+29
- Artificial Analysis Coding IndexKimi K3 by 26.849.476.2+26.8
- ARC-AGI-1Kimi K3 by 21.772.894.5+21.7
- AA IntelligenceKimi K3 by 18.924.743.6+18.9
- HLE (with tools)Kimi K3 by 17.142.759.8+17.1
- matharena_visual_math_overallKimi K3 by 14.476.991.3+14.4
- AA-OmniscienceKimi K3 by 14.35.419.7+14.3
Questions people ask
Which is better, GPT-5.1 or Kimi K3?
Kimi K3 wins all six areas where both have results: coding, agents, reasoning, facts, images and charts and long documents. GPT-5.1 wins none, but costs 38% less.
Which is better for coding?
Kimi K3. It wins 3 of the 3 coding tests both models report; GPT-5.1 wins none.
Which is cheaper?
GPT-5.1 costs $1.25 per million input tokens and $10.00 per million output tokens; Kimi K3 costs $3.00 and $15.00. That makes GPT-5.1 about 38% cheaper for the same work.
How do you compare the two?
We use the 23 benchmark tests both models have published scores on. The verdict counts the 16 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 7 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.