GPT-5.1 vs Kimi K2.6
Wins 0 of 7 areas
—
Wins 6 of 7 areas
Coding · Agents · Reasoning · Images and charts · Long documents · Following instructions
Kimi K2.6 is the stronger all-rounder.
Scores updated · 32 tests both models report · How we compare
Where each one wins
Tests won in each of the seven 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 software15Kimi K2.65 of 6 tests
- AgentsCarrying out multi-step tasks on its own03Kimi K2.63 of 3 tests
- ReasoningHard problems that need careful thinking03Kimi K2.63 of 3 tests
- Images and chartsUnderstanding pictures, charts and video02Kimi K2.62 of 2 tests
- Long documentsFinding answers in very long texts01Kimi K2.61 of 1 test
- Following instructionsDoing exactly what it is asked01Kimi K2.61 of 1 test
- FactsGetting facts right instead of making them up22Even2 each
Long documents 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.
Kimi K2.6 costs 56% less for the same work.
The biggest differences
The three tests each model wins by the widest margin. Scores are out of 100.
Where Kimi K2.6 pulls ahead
- Finds hard-to-locate facts by browsing the webBrowseComp+35.5points ahead
- Command-line tasks in a real terminalTerminal-Bench 2.1+13.5points ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+11.4points ahead
Where GPT-5.1 pulls ahead
- Short factual questions, answered correctlySimpleQA Verified+13.1points ahead
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+5.1points ahead
- Hard command-line tasks in a real terminalTerminal-Bench Hard+1.6points ahead
Every test, side by side
All 32 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingKimi K2.6
- Terminal-Bench 2.1Kimi K2.6 by 13.552.465.9+13.5
- LMArena · WebDevKimi K2.6 by 114 rating points13951509+114 rating
- SciCodeKimi K2.6 by 8.243.351.5+8.2
- SWE-bench VerifiedKimi K2.6 by 3.976.380.2+3.9
- LiveCodeBench v6Kimi K2.6 by 2.68789.6+2.6
- Terminal-Bench HardGPT-5.1 by 1.645.543.9+1.6
AgentsKimi K2.6
- BrowseCompKimi K2.6 by 35.550.886.3+35.5
- GDPValKimi K2.6 by 10.516.527+10.5
- τ-Bench V3 · BankingKimi K2.6 by 7.415.923.3+7.4
ReasoningKimi K2.6
- Humanity's Last ExamKimi K2.6 by 928.537.5+9
- GPQA DiamondKimi K2.6 by 3.887.391.1+3.8
- CritPtKimi K2.6 by 3.14.98+3.1
FactsEven
- SimpleQA VerifiedGPT-5.1 by 13.14834.9+13.1
- AA-Omniscience · Non-hallucinationKimi K2.6 by 11.448.159.5+11.4
- AA-Omniscience · AccuracyGPT-5.1 by 5.137.732.6+5.1
- Vectara HHEM hallucination ratelower is betterKimi K2.6 by 1.312.110.8+1.3
Images and chartsKimi K2.6
- MMMU-ProKimi K2.6 by 3.975.579.4+3.9
- LMArena · VisionKimi K2.6 by 32 rating points12501282+32 rating
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.
- Terminal-Bench 2.0Kimi K2.6 by 19.147.666.7+19.1
- τ²-Bench Telecom (AA run)Kimi K2.6 by 1481.995.9+14
- vectara_avg_summary_lengthGPT-5.1 by 137.7 rating points254.4116.7+137.7 rating
- Artificial Analysis Coding IndexKimi K2.6 by 12.449.461.8+12.4
- HLE (with tools)Kimi K2.6 by 11.342.754+11.3
- AA IntelligenceKimi K2.6 by 2.324.727+2.3
- frontiermath_tier_4_v1Kimi K2.6 by 2.112.514.6+2.1
- vectara_factual_consistencyKimi K2.6 by 1.387.989.2+1.3
- AA Agentic Indextie21.622.1tie
- vectara_answer_ratetie10099.7tie
- AA-Omnisciencetie5.45.3tie
- MMLU-Protie8787.1tie
Questions people ask
Which is better, GPT-5.1 or Kimi K2.6?
Kimi K2.6 wins six of the seven areas where both have results: coding, agents, reasoning, images and charts, long documents and following instructions. GPT-5.1 wins none. They are level on facts.
Which is better for coding?
Kimi K2.6. It wins 5 of the 6 coding tests both models report; GPT-5.1 wins 1.
Which is cheaper?
GPT-5.1 costs $1.25 per million input tokens and $10.00 per million output tokens; Kimi K2.6 costs $0.95 and $4.00. That makes Kimi K2.6 about 56% cheaper for the same work.
How do you compare the two?
We use the 32 benchmark tests both models have published scores on. The verdict counts the 20 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.