GPT-5.6 Sol vs Kimi K2.6
Wins 6 of 8 areas
Coding · Agents · Reasoning · Images and charts · Math · Long documents
Wins 0 of 8 areas
—
GPT-5.6 Sol is the stronger all-rounder.Kimi K2.6 is cheaper.
Scores updated · 53 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.
- AgentsCarrying out multi-step tasks on its own80GPT-5.6 Sol8 of 8 tests
- CodingWriting and fixing software70GPT-5.6 Sol7 of 7 tests
- ReasoningHard problems that need careful thinking40GPT-5.6 Sol4 of 4 tests
- MathCompetition and research-level math40GPT-5.6 Sol4 of 4 tests
- Images and chartsUnderstanding pictures, charts and video10GPT-5.6 Sol1 of 3 tests · 2 ties
- Long documentsFinding answers in very long texts10GPT-5.6 Sol1 of 1 test
- FactsGetting facts right instead of making them up22Even2 each
- Following instructionsDoing exactly what it is asked11Even1 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.
Kimi K2.6 costs 79% 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-5.6 Sol pulls ahead
- Extremely hard research-level math problemsFrontierMath Tier 4+57.4points ahead
- Complex command-line tasks across many fieldsTerminal-Bench 4.0+39.4points ahead
- Short factual questions, answered correctlySimpleQA Verified+34.8points ahead
Where Kimi K2.6 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+51.7points ahead
- Follows unfamiliar, precisely checkable instructionsIFBench+3.3points ahead
Every test, side by side
All 53 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGPT-5.6 Sol
- Terminal-Bench 2.1GPT-5.6 Sol by 22.18865.9+22.1
- Terminal-Bench HardGPT-5.6 Sol by 2265.943.9+22
- LMArena · WebDevGPT-5.6 Sol by 111 rating points16201509+111 rating
- LiveBench · Agentic CodingGPT-5.6 Sol by 9.356.246.9+9.3
- SWE-bench ProGPT-5.6 Sol by 664.658.6+6
- SciCodeGPT-5.6 Sol by 5.657.151.5+5.6
- LiveBench · CodingGPT-5.6 Sol by 5.383.978.6+5.3
AgentsGPT-5.6 Sol
- Terminal-Bench 4.0GPT-5.6 Sol by 39.439.90.5+39.4
- GDPValGPT-5.6 Sol by 28.655.627+28.6
- AA IT-Bench SREGPT-5.6 Sol by 2556.231.2+25
- τ-Bench V3 · BankingGPT-5.6 Sol by 2144.323.3+21
- MCP AtlasGPT-5.6 Sol by 15.583.668.1+15.5
- AA ApexAgentsGPT-5.6 Sol by 11.439.928.5+11.4
- OSWorld-VerifiedGPT-5.6 Sol by 9.98373.1+9.9
- BrowseCompGPT-5.6 Sol by 4.190.486.3+4.1
ReasoningGPT-5.6 Sol
- CritPtGPT-5.6 Sol by 24.332.38+24.3
- LiveBench · ReasoningGPT-5.6 Sol by 12.391.779.4+12.3
- Humanity's Last ExamGPT-5.6 Sol by 1249.537.5+12
- GPQA DiamondGPT-5.6 Sol by 394.191.1+3
FactsEven
- AA-Omniscience · Non-hallucinationKimi K2.6 by 51.77.859.5+51.7
- SimpleQA VerifiedGPT-5.6 Sol by 34.869.734.9+34.8
- AA-Omniscience · AccuracyGPT-5.6 Sol by 26.859.432.6+26.8
- Vectara HHEM hallucination ratelower is betterKimi K2.6 by 1.612.410.8+1.6
Images and chartsGPT-5.6 Sol
- MMMU-ProGPT-5.6 Sol by 483.479.4+4
- CharXiv (RQ)tie85.886.7tie
- LMArena · Visiontie12791282tie
MathGPT-5.6 Sol
- FrontierMath Tier 4GPT-5.6 Sol by 57.48325.6+57.4
- FrontierMath Tiers 1-3 (v2)GPT-5.6 Sol by 31.989.157.2+31.9
- LiveBench · MathematicsGPT-5.6 Sol by 11.996.284.3+11.9
- AIME 2026GPT-5.6 Sol by 3.599.996.4+3.5
Following instructionsEven
- LiveBench · Instruction FollowingGPT-5.6 Sol by 7.571.864.4+7.5
- IFBenchKimi K2.6 by 3.372.776+3.3
Other results20 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.
- GDPval-AA v2GPT-5.6 Sol by 521 rating points17111190+521 rating
- AA Agentic IndexGPT-5.6 Sol by 28.450.522.1+28.4
- AA IntelligenceGPT-5.6 Sol by 204727+20
- AA-OmniscienceGPT-5.6 Sol by 16.7225.3+16.7
- Artificial Analysis Coding IndexGPT-5.6 Sol by 15.677.461.8+15.6
- livebench_data_analysisGPT-5.6 Sol by 14.779.865.1+14.7
- HiL-Bench (Tools-allowed)GPT-5.6 Sol by 13.632.318.7+13.6
- livebench_languageGPT-5.6 Sol by 12.687.775.1+12.6
- τ³-Bench BankingGPT-5.6 Sol by 12.43320.6+12.4
- τ²-Bench Telecom (AA run)Kimi K2.6 by 10.885.195.9+10.8
- HLE (with tools)GPT-5.6 Sol by 10.564.554+10.5
- ToolathlonGPT-5.6 Sol by 85850+8
- BrowseComp (w/ Ctx)GPT-5.6 Sol by 6.289.483.2+6.2
- SWEBench Pro PublicGPT-5.6 Sol by 664.658.6+6
- Global-MMLU-LiteGPT-5.6 Sol by 3.491.888.4+3.4
- vectara_factual_consistencyKimi K2.6 by 1.687.689.2+1.6
- vectara_avg_summary_lengthGPT-5.6 Sol by 14.4 rating points131.1116.7+14.4 rating
- StrongREJECTKimi K2.6 by 1.398.599.8+1.3
- charxiv_rq_with_pythonGPT-5.6 Sol by 1.187.886.7+1.1
- vectara_answer_ratetie99.199.7tie
Questions people ask
Which is better, GPT-5.6 Sol or Kimi K2.6?
GPT-5.6 Sol wins six of the eight areas we test: coding, agents, reasoning, images and charts, math and long documents. Kimi K2.6 wins none, but costs 79% less. They are level on facts and following instructions.
Which is better for coding?
GPT-5.6 Sol. It wins 7 of the 7 coding tests both models report; Kimi K2.6 wins none.
Which is cheaper?
GPT-5.6 Sol costs $4.00 per million input tokens and $20.00 per million output tokens; Kimi K2.6 costs $0.95 and $4.00. That makes Kimi K2.6 about 79% cheaper for the same work.
How do you compare the two?
We use the 53 benchmark tests both models have published scores on. The verdict counts the 33 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 20 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.