GPT-5.6 Sol vs Kimi K3
Wins 3 of 8 areas
Reasoning · Facts · Math
Wins 2 of 8 areas
Coding · Long documents
GPT-5.6 Sol wins more areas, narrowly.Kimi K3 is cheaper and better at coding.
Both rank among the ten best models we track in agents.
Scores updated · 58 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.
- ReasoningHard problems that need careful thinking50GPT-5.6 Sol5 of 6 tests · 1 tie
- MathCompetition and research-level math40GPT-5.6 Sol4 of 4 tests
- FactsGetting facts right instead of making them up21GPT-5.6 Sol2 of 3 tests
- CodingWriting and fixing software23Kimi K33 of 5 tests
- Long documentsFinding answers in very long texts01Kimi K31 of 1 test
- AgentsCarrying out multi-step tasks on its own33Even3 each · 2 ties
- Images and chartsUnderstanding pictures, charts and video11Even1 each
- Following instructionsDoing exactly what it is asked00Even0 each · 1 tie
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 K3 costs 25% less for the same work.
The biggest differences
The three tests each model wins by the widest margin. Scores are out of 100.
Where GPT-5.6 Sol pulls ahead
- Extremely hard research-level math problemsFrontierMath Tier 4+44points ahead
- Abstract visual puzzles that people can solveARC-AGI-2+32.1points ahead
- Complex command-line tasks across many fieldsTerminal-Bench 4.0+27.3points ahead
Where Kimi K3 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+39points ahead
- Fixes real GitHub issues, working as an agentLiveBench · Agentic Coding+6points ahead
- Reasoning about charts from research papersCharXiv (RQ)+5.5points ahead
Every test, side by side
All 58 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingKimi K3
- LiveBench · Agentic CodingKimi K3 by 656.262.2+6
- LMArena · WebDevKimi K3 by 37 rating points16181655+37 rating
- Terminal-Bench 2.1GPT-5.6 Sol by 38885+3
- LiveBench · CodingGPT-5.6 Sol by 2.483.981.5+2.4
- SciCodeKimi K3 by 2.457.159.5+2.4
AgentsEven
- Terminal-Bench 4.0GPT-5.6 Sol by 27.339.912.6+27.3
- AA IT-Bench SREGPT-5.6 Sol by 8.556.247.7+8.5
- GDPValGPT-5.6 Sol by 3.955.651.7+3.9
- OSWorld-VerifiedKimi K3 by 1.88384.8+1.8
- τ-Bench V3 · BankingKimi K3 by 1.744.346+1.7
- AA ApexAgentsKimi K3 by 1.439.941.3+1.4
- BrowseComptie90.491.2tie
- MCP Atlastie83.684.2tie
ReasoningGPT-5.6 Sol
- ARC-AGI-2GPT-5.6 Sol by 32.192.560.4+32.1
- CritPtGPT-5.6 Sol by 8.932.323.4+8.9
- SimpleBenchGPT-5.6 Sol by 4.164.860.7+4.1
- Humanity's Last ExamGPT-5.6 Sol by 2.649.546.9+2.6
- LiveBench · ReasoningGPT-5.6 Sol by 191.790.7+1
- GPQA Diamondtie94.193.5tie
FactsGPT-5.6 Sol
- AA-Omniscience · Non-hallucinationKimi K3 by 397.846.8+39
- SimpleQA VerifiedGPT-5.6 Sol by 19.169.750.6+19.1
- AA-Omniscience · AccuracyGPT-5.6 Sol by 11.859.447.6+11.8
Images and chartsEven
- CharXiv (RQ)Kimi K3 by 5.585.891.3+5.5
- MMMU-ProGPT-5.6 Sol by 2.983.480.5+2.9
MathGPT-5.6 Sol
- FrontierMath Tier 4GPT-5.6 Sol by 448339+44
- FrontierMath Tiers 1-3 (v2)GPT-5.6 Sol by 16.989.172.2+16.9
- LiveBench · MathematicsGPT-5.6 Sol by 11.896.284.4+11.8
- AIME 2026GPT-5.6 Sol by 3.299.996.7+3.2
Following instructionsEven
- LiveBench · Instruction Followingtie71.871.4tie
Other results28 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.
- Program BenchKimi K3 by 52.82577.8+52.8
- Agents' Last ExamGPT-5.6 Sol by 24.452.728.3+24.4
- Terminal-bench 3.0GPT-5.6 Sol by 1734.417.4+17
- ToolathlonKimi K3 by 15.25873.2+15.2
- JobBenchKimi K3 by 7.545.452.9+7.5
- ProgramBench (Almost Solved)GPT-5.6 Sol by 5.52317.5+5.5
- DeepSWEGPT-5.6 Sol by 5.272.767.5+5.2
- HLE (with tools)GPT-5.6 Sol by 4.764.559.8+4.7
- CyberGymGPT-5.6 Sol by 4.584.580+4.5
- DeepSWE 1.1GPT-5.6 Sol by 47369+4
- AA IntelligenceGPT-5.6 Sol by 3.44743.6+3.4
- GDPval-AA v2GPT-5.6 Sol by 29 rating points17111682+29 rating
- GDPval-AA v2 EloGPT-5.6 Sol by 24 rating points17101686+24 rating
- ResearchRubricsKimi K3 by 2.473.876.2+2.4
- SpreadsheetBench 2Kimi K3 by 2.432.434.8+2.4
- AA-OmniscienceGPT-5.6 Sol by 2.32219.7+2.3
- livebench_languageGPT-5.6 Sol by 2.287.785.5+2.2
- MLS Bench Litelower is betterGPT-5.6 Sol by 2.146.248.3+2.1
- ARC-AGI-1GPT-5.6 Sol by 296.594.5+2
- MCP Mark VerifiedKimi K3 by 1.692.994.5+1.6
- Toolathlon VerifiedKimi K3 by 1.674.976.5+1.6
- Artificial Analysis Coding IndexGPT-5.6 Sol by 1.277.476.2+1.2
- livebench_data_analysisGPT-5.6 Sol by 1.179.878.7+1.1
- Agents' Last Exam (ALE-CLI)GPT-5.6 Sol by 128.627.6+1
- SWE-Marathontie42.542tie
- PostTrainBenchtie36.236.6tie
- AA Agentic Indextie50.550.6tie
- OfficeQA Protie63.263.3tie
Questions people ask
Which is better, GPT-5.6 Sol or Kimi K3?
GPT-5.6 Sol wins three of the eight areas we test: reasoning, facts and math. Kimi K3 wins coding and long documents, and costs 25% less. They are level on agents, images and charts and following instructions.
Which is better for coding?
Kimi K3. It wins 3 of the 5 coding tests both models report; GPT-5.6 Sol wins 2.
Which is cheaper?
GPT-5.6 Sol costs $4.00 per million input tokens and $20.00 per million output tokens; Kimi K3 costs $3.00 and $15.00. That makes Kimi K3 about 25% cheaper for the same work.
How do you compare the two?
We use the 58 benchmark tests both models have published scores on. The verdict counts the 30 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 28 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.