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GPT-5.6 Sol vs Kimi K3

GPT-5.6 Sol leads Kimi K3 on coding, 73.5 to 62.3 on the Vibe Coding Index, and Kimi K3 costs 1.3x less per output token ($15.00 vs $20.00 per million). Updated October 21, 2026; 112 benchmarks have a result for both.

Replace GPT-5.6 Sol Replace Kimi K3
GPT-5.6 SolOpenAI
Coding
73.5
Overall
74.7
Output $/M
$20.00
55
Kimi K3Moonshot AI
Coding
62.3
Overall
66.5
Output $/M
$15.00
57
vs boards won of 112 shared

GPT-5.6 Sol or Kimi K3: which to pick

Pick GPT-5.6 Sol for coding: it scores 73.5 on the Vibe Coding Index against 62.3 for Kimi K3.

Pick Kimi K3 for output tokens 1.3x cheaper ($15.00 vs $20.00 per million) and a lower cost per solved task ($0.81 against $1.20).

Model AGPT-5.6 SolOpenAI73.5/1006 independent benchmarks$1.20 per solved taskModel BKimi K3Moonshot AI62.3/1006 independent benchmarks$0.81 per solved task
Shared results
112
GPT-5.6 Sol only
27
Kimi K3 only
5
Like-for-like categories
8 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
GPT-5.6 Sol 73.5 from 6 benchmarks, Kimi K3 62.3 from 6 benchmarks.
Widest category
Math, 12.1 points apart on average over 6 shared benchmarks.
Widest single gap
LiveBench browser: GPT-5.6 Sol 88.0% against Kimi K3 16.0%, 72.0 points apart on a 0 to 100 scale.
Output price
GPT-5.6 Sol $20.00 against Kimi K3 $15.00 per million output tokens, 1.3x apart.
Context window
GPT-5.6 Sol takes 1.05M tokens, Kimi K3 1.05M.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
CategoryGPT-5.6 SolBarsKimi K3Ties
Coding149
Intelligence20
Agentic work138
Reasoning113
Math33
Knowledge47
Web design35
General522
All shared boards5557
CodingLike-for-likeSix of these boards feed the Vibe Coding Index149
Coding benchmarks for GPT-5.6 Sol and Kimi K3
BenchmarkGPT-5.6 SolKimi K3Leader
LiveBench coding89.7%59.3%GPT-5.6 Sol
LMArena WebDev16161655Kimi K3
AA Coding Index77.476.2GPT-5.6 Sol
LiveCodeBench (Vals AI)82.6%87.2%Kimi K3
SWE-bench Verified (Vals AI)96.2%93.4%GPT-5.6 Sol
Terminal-Bench 4 (Vals AI)37.9%17.2%GPT-5.6 Sol
Vibe Code Bench (Vals AI)80.5%85.0%Kimi K3
Code migration (Vals AI)52.9%16.1%GPT-5.6 Sol
ProgramBench (Vals AI)1.5%2.0%Kimi K3
IOI (Vals AI)91.2%48.9%GPT-5.6 Sol
Terminal-Bench 2.1 (Vals AI)85.8%80.9%GPT-5.6 Sol
SWE-bench Multimodal (Vals AI)Not measured44.2%Only Kimi K3 measured
Vibe Code Bench 1-100 (Vals AI)20.0%18.2%GPT-5.6 Sol
SkillsBench (Vals AI)54.1%Not measuredOnly GPT-5.6 Sol measured
CyberBench (Vals AI)76.3%75.2%GPT-5.6 Sol
SciCode57.8%59.5%Kimi K3
Terminal-Bench Hard (Artificial Analysis run)65.9%Not measuredOnly GPT-5.6 Sol measured
FrontierCode47.5%44.2%GPT-5.6 Sol
FrontierSWE32.2%25.9%GPT-5.6 Sol
GSO-Bench76.5%Not measuredOnly GPT-5.6 Sol measured
WeirdML88.8%82.6%GPT-5.6 Sol
MirrorCode20.0%Not measuredOnly GPT-5.6 Sol measured
ALE-Bench2176.91524.5GPT-5.6 Sol
LMArena Text: coding14961508Kimi K3
LMArena Text: software and IT14891499Kimi K3
LMArena WebDev: React16201670Kimi K3
LMArena WebDev: HTML16181644Kimi K3
LMArena WebDev: from an image16091579GPT-5.6 Sol
SciCode10.8%Not measuredOnly GPT-5.6 Sol measured
Neither model has a result on the other 10 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for GPT-5.6 Sol and Kimi K3
BenchmarkGPT-5.6 SolKimi K3Leader
AA Intelligence Index47.043.6GPT-5.6 Sol
Epoch Capabilities Index162.8157.9GPT-5.6 Sol
Agentic workLike-for-likePublic boards, shown as published, kept out of the index138
Agentic work benchmarks for GPT-5.6 Sol and Kimi K3
BenchmarkGPT-5.6 SolKimi K3Leader
AA Agentic Index50.250.0GPT-5.6 Sol
Design Arena: agents building web apps12451295Kimi K3
Design Arena: agents building full-stack apps12611315Kimi K3
Design Arena: agents building mobile apps12481269Kimi K3
Design Arena: agents building Android apps12391250Kimi K3
Design Arena: agents building Godot games12601223GPT-5.6 Sol
Design Arena: agents building games12671252GPT-5.6 Sol
Design Arena: HTML slides12861256GPT-5.6 Sol
Design Arena: PowerPoint slides12411273Kimi K3
Design Arena: spreadsheetsNot measured1058Only Kimi K3 measured
LiveBench research54.5%79.0%Kimi K3
LiveBench browser88.0%16.0%GPT-5.6 Sol
LiveBench long agentic48.5%42.8%GPT-5.6 Sol
SREBench (Vals AI)30.5%Not measuredOnly GPT-5.6 Sol measured
Finance Agent (Vals AI)53.8%53.1%GPT-5.6 Sol
Tax Agent Bench (Vals AI)31.1%33.4%Kimi K3
Legal Research Bench (Vals AI)48.1%46.1%GPT-5.6 Sol
Harvey's Legal Agent Benchmark (Vals AI)Not measured12.9%Only Kimi K3 measured
Excel Modeling Benchmark (Vals AI)72.3%66.7%GPT-5.6 Sol
BioMysteryBench (Vals AI)71.1%72.6%Kimi K3
Terminal-Bench-Science (Vals AI)20.0%1.4%GPT-5.6 Sol
Vals Science Index41.5%Not measuredOnly GPT-5.6 Sol measured
Time Horizon Index (Vals AI)23.8%10.5%GPT-5.6 Sol
CUA-bench (Vals AI)8.3%Not measuredOnly GPT-5.6 Sol measured
τ²-Bench Telecom85.1%Not measuredOnly GPT-5.6 Sol measured
APEX-AgentsNot measured47.8%Only Kimi K3 measured
OSWorld 2.027.3%Not measuredOnly GPT-5.6 Sol measured
BALROG60.0%Not measuredOnly GPT-5.6 Sol measured
PostTrainBench36.2%32.0%GPT-5.6 Sol
Vending-Bench 2$9,619$5,165GPT-5.6 Sol
LMArena Search1261Not measuredOnly GPT-5.6 Sol measured
Neither model has a result on the other 10 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index113
Reasoning benchmarks for GPT-5.6 Sol and Kimi K3
BenchmarkGPT-5.6 SolKimi K3Leader
GPQA Diamond95.2%92.9%GPT-5.6 Sol
LiveBench reasoning91.7%90.7%GPT-5.6 Sol
MysteryMechanism (Vals AI)33.3%Not measuredOnly GPT-5.6 Sol measured
MMMU Pro (Vals AI)88.8%88.2%GPT-5.6 Sol
GPQA Diamond (Artificial Analysis run)94.1%93.5%GPT-5.6 Sol
Humanity's Last Exam (Artificial Analysis run)49.5%46.9%GPT-5.6 Sol
GPQA Diamond (Epoch AI run)93.5%93.1%GPT-5.6 Sol
ARC-AGI97.5%94.5%GPT-5.6 Sol
ARC-AGI-292.5%60.4%GPT-5.6 Sol
SimpleBench64.8%60.7%GPT-5.6 Sol
Chess puzzles59.0%37.0%GPT-5.6 Sol
Mystery game puzzles58.0%26.0%GPT-5.6 Sol
EBR-bench44.8%Not measuredOnly GPT-5.6 Sol measured
LMArena Text: hard prompts14831495Kimi K3
LMArena Text: expert15171520Kimi K3
LMArena Text: hard prompts in English14771496Kimi K3
LMArena Vision: diagrams1305Not measuredOnly GPT-5.6 Sol measured
LMArena Vision: homework1305Not measuredOnly GPT-5.6 Sol measured
Kagi LLM Benchmark67.0%Not measuredOnly GPT-5.6 Sol measured
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index33
Math benchmarks for GPT-5.6 Sol and Kimi K3
BenchmarkGPT-5.6 SolKimi K3Leader
OTIS Mock AIME100.0%97.2%GPT-5.6 Sol
FrontierMath, tiers 1 to 389.1%72.2%GPT-5.6 Sol
FrontierMath, tier 482.9%39.0%GPT-5.6 Sol
ProofBench83.0%87.0%Kimi K3
LMArena Text: math14731494Kimi K3
LMArena Text: mathematical work14961505Kimi K3
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index47
Knowledge benchmarks for GPT-5.6 Sol and Kimi K3
BenchmarkGPT-5.6 SolKimi K3Leader
MMLU Pro89.1%88.0%GPT-5.6 Sol
LegalBench (Vals AI)87.0%86.2%GPT-5.6 Sol
CorpFin (Vals AI)64.4%71.6%Kimi K3
TaxEval (Vals AI)74.8%75.7%Kimi K3
MortgageTax (Vals AI)67.3%66.3%GPT-5.6 Sol
MedCode (Vals AI)44.0%49.4%Kimi K3
SimpleQA Verified69.7%50.6%GPT-5.6 Sol
LMArena Text: science14551508Kimi K3
LMArena Text: medicine and healthcare14311489Kimi K3
LMArena Text: legal and government14761503Kimi K3
LMArena Text: business and finance14571470Kimi K3
FACTS Benchmark Suite52.4%Not measuredOnly GPT-5.6 Sol measured
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index35
Web design benchmarks for GPT-5.6 Sol and Kimi K3
BenchmarkGPT-5.6 SolKimi K3Leader
Design Arena: websites13211335Kimi K3
Design Arena: UI components13361344Kimi K3
Design Arena: game dev13681359GPT-5.6 Sol
Design Arena: data viz13221351Kimi K3
Design Arena: 3D13861388Kimi K3
Design Arena: all code categories13411360Kimi K3
Design Arena: SVG13161302GPT-5.6 Sol
Design Arena: ASCII art1304Not measuredOnly GPT-5.6 Sol measured
LiveBench design81.6%77.2%GPT-5.6 Sol
GeneralLike-for-likePublic boards, shown as published, kept out of the index522
General benchmarks for GPT-5.6 Sol and Kimi K3
BenchmarkGPT-5.6 SolKimi K3Leader
Vals IndexNot measured53.0%Only Kimi K3 measured
LiveBench data analysis79.8%78.7%GPT-5.6 Sol
Public Benefits Bench (Vals AI)66.5%68.2%Kimi K3
SAGE (Vals AI)52.6%52.8%Kimi K3
MedScribe (Vals AI)85.2%88.0%Kimi K3
Vals Multimodal Index72.6%73.4%Kimi K3
IFBench72.7%Not measuredOnly GPT-5.6 Sol measured
Long context reasoning (AA-LCR)84.0%88.7%Kimi K3
DTBench95.7%91.2%GPT-5.6 Sol
LMCA58.5%52.7%GPT-5.6 Sol
Surface Evolver Bench93.1%95.0%Kimi K3
Furniture assembly56.7%34.2%GPT-5.6 Sol
LMArena Text14571476Kimi K3
LMArena Text: instruction following14831485Kimi K3
LMArena Text: creative writing14491457Kimi K3
LMArena Vision1281Not measuredOnly GPT-5.6 Sol measured
LMArena Text: English14571481Kimi K3
LMArena Text: non-English14511466Kimi K3
LMArena Text: Chinese15251529Kimi K3
LMArena Text: German14761490Kimi K3
LMArena Text: Japanese14721494Kimi K3
LMArena Text: Korean14421460Kimi K3
LMArena Text: French14721492Kimi K3
LMArena Text: Spanish14431472Kimi K3
LMArena Text: Russian14711485Kimi K3
LMArena Text: Polish14591458GPT-5.6 Sol
LMArena Text: multi-turn14611489Kimi K3
LMArena Text: longer queries14811494Kimi K3
LMArena Text: writing and language14621471Kimi K3
LMArena Text: entertainment and media14501453Kimi K3
LMArena Vision: English1280Not measuredOnly GPT-5.6 Sol measured
LMArena Vision: Chinese1313Not measuredOnly GPT-5.6 Sol measured
LMArena Vision: reading text1290Not measuredOnly GPT-5.6 Sol measured
LMArena Vision: humor1246Not measuredOnly GPT-5.6 Sol measured
LMArena Vision: creative writing1283Not measuredOnly GPT-5.6 Sol measured
LMArena Document1483Not measuredOnly GPT-5.6 Sol measured
Neither model has a result on the other 10 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-5.6 Sol and Kimi K3
BenchmarkGPT-5.6 SolKimi K3Leader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

GPT-5.6 Sol$0.014Fits in one request
Kimi K3$0.011Fits in one request

Kimi K3 costs less

Repository review

50K input + 3K output tokens

GPT-5.6 Sol$0.260Fits in one request
Kimi K3$0.195Fits in one request

Kimi K3 costs less

Agent loop

200K input + 10K output tokens

GPT-5.6 Sol$1.00Fits in one request
Kimi K3$0.750Fits in one request

Kimi K3 costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of GPT-5.6 Sol and Kimi K3
SpecificationOpenAI GPT-5.6 SolMoonshotAI Kimi K3
MakerOpenAIMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedJuly 9, 2026July 16, 2026
Context window1.05M1.05M
Input $/Mtok$4.00$3.00
Output $/Mtok$20.00$15.00
Coding index73.562.3
Independent measurements behind it66
Cost per solved task$1.20$0.81
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.6 Sol better than Kimi K3 for coding?

Pick GPT-5.6 Sol for coding: it scores 73.5 on the Vibe Coding Index against 62.3 for Kimi K3. Pick Kimi K3 for output tokens 1.3x cheaper ($15.00 vs $20.00 per million) and a lower cost per solved task ($0.81 against $1.20).

Which is cheaper, GPT-5.6 Sol or Kimi K3?

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. Per solved SWE-bench Verified task, GPT-5.6 Sol costs $1.20 and Kimi K3 $0.81.

Which has the bigger context window, GPT-5.6 Sol or Kimi K3?

GPT-5.6 Sol, with 1.05M tokens against 1.05M.

How many benchmarks is the GPT-5.6 Sol vs Kimi K3 comparison based on?

112 benchmarks have a result for both models as of October 21, 2026. GPT-5.6 Sol's coding index rests on 6 independent benchmarks and Kimi K3's on 6. Where only one model has a result, the page says so instead of naming a winner.

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