GPT-5.4 nano vs Kimi K2.6
Wins 1 of 8 areas
Following instructions
Wins 6 of 8 areas
Coding · Agents · Facts · Images and charts · Math · Long documents
Kimi K2.6 is the stronger all-rounder.GPT-5.4 nano is cheaper and better at following instructions.
Scores updated · 44 tests both models report · How we compare
Where each one wins
Tests won in each of the eight areas we test. 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 software05Kimi K2.65 of 6 tests · 1 tie
- AgentsCarrying out multi-step tasks on its own15Kimi K2.65 of 7 tests · 1 tie
- FactsGetting facts right instead of making them up13Kimi K2.63 of 4 tests
- Images and chartsUnderstanding pictures, charts and video02Kimi K2.62 of 2 tests
- MathCompetition and research-level math12Kimi K2.62 of 3 tests
- Long documentsFinding answers in very long texts01Kimi K2.61 of 1 test
- Following instructionsDoing exactly what it is asked10GPT-5.4 nano1 of 2 tests · 1 tie
- ReasoningHard problems that need careful thinking22Even2 each
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-5.4 nano costs 71% 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
- Completes tasks by operating a computer desktopOSWorld-Verified+34.1points ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+33.7points ahead
- Short factual questions, answered correctlySimpleQA Verified+23.2points ahead
Where GPT-5.4 nano pulls ahead
- Fresh competition math problemsLiveBench · Mathematics+6.7points ahead
- Customer-service tasks in a simulated bankτ-Bench V3 · Banking+4.1points ahead
- Follows detailed instructions exactlyLiveBench · Instruction Following+2.8points ahead
Every test, side by side
All 44 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingKimi K2.6
- LiveBench · CodingKimi K2.6 by 7.870.878.6+7.8
- SWE-bench ProKimi K2.6 by 6.252.458.6+6.2
- Terminal-Bench 2.1Kimi K2.6 by 5.260.765.9+5.2
- SciCodeKimi K2.6 by 4.347.251.5+4.3
- Terminal-Bench HardKimi K2.6 by 1.542.443.9+1.5
- LiveBench · Agentic Codingtie46.846.9tie
AgentsKimi K2.6
- OSWorld-VerifiedKimi K2.6 by 34.13973.1+34.1
- MCP AtlasKimi K2.6 by 1256.168.1+12
- AA IT-Bench SREKimi K2.6 by 6.824.431.2+6.8
- GDPValKimi K2.6 by 4.522.527+4.5
- τ-Bench V3 · BankingGPT-5.4 nano by 4.127.423.3+4.1
- AA ApexAgentsKimi K2.6 by 3.624.928.5+3.6
- Terminal-Bench 4.0tie0.50.5tie
ReasoningEven
- GPQA DiamondKimi K2.6 by 9.481.791.1+9.4
- Humanity's Last ExamKimi K2.6 by 9.228.337.5+9.2
- LiveBench · ReasoningGPT-5.4 nano by 1.781.179.4+1.7
- CritPtGPT-5.4 nano by 1.39.38+1.3
FactsKimi K2.6
- AA-Omniscience · Non-hallucinationKimi K2.6 by 33.725.859.5+33.7
- SimpleQA VerifiedKimi K2.6 by 23.211.734.9+23.2
- Vectara HHEM hallucination ratelower is betterGPT-5.4 nano by 7.73.110.8+7.7
- AA-Omniscience · AccuracyKimi K2.6 by 6.925.732.6+6.9
Images and chartsKimi K2.6
- MMMU-ProKimi K2.6 by 1465.479.4+14
- LMArena · VisionKimi K2.6 by 86 rating points11961282+86 rating
MathKimi K2.6
- FrontierMath Tier 4Kimi K2.6 by 13.412.225.6+13.4
- FrontierMath Tiers 1-3 (v2)Kimi K2.6 by 12.344.957.2+12.3
- LiveBench · MathematicsGPT-5.4 nano by 6.79184.3+6.7
Following instructionsGPT-5.4 nano
- LiveBench · Instruction FollowingGPT-5.4 nano by 2.867.264.4+2.8
- IFBenchtie75.976tie
Other results15 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-OmniscienceKimi K2.6 by 34.8-29.55.3+34.8
- Terminal-Bench 2.0Kimi K2.6 by 20.446.366.7+20.4
- τ²-Bench Telecom (AA run)Kimi K2.6 by 19.97695.9+19.9
- ToolathlonKimi K2.6 by 14.535.550+14.5
- livebench_languageKimi K2.6 by 12.662.575.1+12.6
- frontiermath_tier_4_v1Kimi K2.6 by 8.36.314.6+8.3
- vectara_factual_consistencyGPT-5.4 nano by 7.796.989.2+7.7
- Finance Agent v2Kimi K2.6 by 6.738.244.9+6.7
- AA IntelligenceKimi K2.6 by 6.320.727+6.3
- Artificial Analysis Coding IndexKimi K2.6 by 5.756.161.8+5.7
- AA Agentic IndexKimi K2.6 by 4.417.722.1+4.4
- vectara_avg_summary_lengthGPT-5.4 nano by 27.7 rating points144.4116.7+27.7 rating
- livebench_data_analysisGPT-5.4 nano by 2.567.665.1+2.5
- LiveBenchKimi K2.6 by 2.170.172.2+2.1
- vectara_answer_ratetie10099.7tie
Questions people ask
Which is better, GPT-5.4 nano or Kimi K2.6?
Kimi K2.6 wins six of the eight areas we test: coding, agents, facts, images and charts, math and long documents. GPT-5.4 nano wins following instructions, and costs 71% less. They are level on reasoning.
Which is better for coding?
Kimi K2.6. It wins 5 of the 6 coding tests both models report; GPT-5.4 nano wins none, and 1 is a tie.
Which is cheaper?
GPT-5.4 nano costs $0.20 per million input tokens and $1.25 per million output tokens; Kimi K2.6 costs $0.95 and $4.00. That makes GPT-5.4 nano about 71% cheaper for the same work.
How do you compare the two?
We use the 44 benchmark tests both models have published scores on. The verdict counts the 29 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 15 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.