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GPT-5.6 Sol vs Kimi K2.6

Updated October 21, 2026. 106 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace GPT-5.6 Sol Replace Kimi K2.6
GPT-5.6 SolOpenAI
Coding
76.7
Overall
47.0
Output $/M
$20.00
90
Kimi K2.6Moonshot AI
Coding
44.2
Overall
27.0
Output $/M
$3.41
16
vs boards won of 106 shared

Decision reading

Pick GPT-5.6 Sol for coding: it scores 76.7 on the Vibe Coding Index against 44.2 for Kimi K2.6.

Pick Kimi K2.6 when output tokens cost 5.9x less, or when a solved task costs $0.35 against $1.20.

Model AGPT-5.6 SolOpenAI76.7/1002 independent benchmarks$1.20 per solved taskModel BKimi K2.6Moonshot AI44.2/1001 independent benchmark$0.35 per solved task
Shared results
106
GPT-5.6 Sol only
30
Kimi K2.6 only
3
Like-for-like categories
8 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

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 76.7 from 2 benchmarks, Kimi K2.6 44.2 from 1 benchmark.
Widest category
Math, 27.2 points apart on average over 6 shared benchmarks.
Widest single gap
ProofBench: GPT-5.6 Sol 83.0% against Kimi K2.6 16.0%, 67.0 points apart on a 0 to 100 scale.
Output price
GPT-5.6 Sol $20.00 against Kimi K2.6 $3.41 per million output tokens, 5.9x apart.
Context window
GPT-5.6 Sol takes 1.05M tokens, Kimi K2.6 262K.

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 K2.6Ties
Coding161
Intelligence20
Agentic work142
Reasoning121
Math51
Knowledge83
Web design80
General258
All shared boards9016
CodingLike-for-likeFour of these boards feed the Vibe Coding Index161
Coding benchmarks for GPT-5.6 Sol and Kimi K2.6
BenchmarkGPT-5.6 SolKimi K2.6Leader
LiveBench coding89.7%Not measuredOnly GPT-5.6 Sol measured
LMArena WebDev16161509GPT-5.6 Sol
AA Coding Index77.461.8GPT-5.6 Sol
LiveCodeBench (Vals AI)82.6%86.8%Kimi K2.6
SWE-bench Verified (Vals AI)96.2%76.2%GPT-5.6 Sol
Terminal-Bench 4 (Vals AI)37.9%Not measuredOnly GPT-5.6 Sol measured
Vibe Code Bench (Vals AI)80.5%37.9%GPT-5.6 Sol
Code migration (Vals AI)52.9%27.8%GPT-5.6 Sol
ProgramBench (Vals AI)1.5%0.0%GPT-5.6 Sol
IOI (Vals AI)91.2%Not measuredOnly GPT-5.6 Sol measured
Terminal-Bench 2.1 (Vals AI)85.8%53.6%GPT-5.6 Sol
Vibe Code Bench 1-100 (Vals AI)20.0%Not measuredOnly GPT-5.6 Sol measured
SkillsBench (Vals AI)54.1%Not measuredOnly GPT-5.6 Sol measured
CyberBench (Vals AI)76.3%Not measuredOnly GPT-5.6 Sol measured
SciCode57.8%51.5%GPT-5.6 Sol
Terminal-Bench Hard (Artificial Analysis run)65.9%43.9%GPT-5.6 Sol
FrontierCode47.5%Not measuredOnly GPT-5.6 Sol measured
FrontierSWE32.2%Not measuredOnly GPT-5.6 Sol measured
GSO-Bench76.5%Not measuredOnly GPT-5.6 Sol measured
WeirdML88.8%55.9%GPT-5.6 Sol
MirrorCode20.0%Not measuredOnly GPT-5.6 Sol measured
ALE-Bench2176.91092.7GPT-5.6 Sol
LMArena Text: coding14961489GPT-5.6 Sol
LMArena Text: software and IT14891484GPT-5.6 Sol
LMArena WebDev: React16201505GPT-5.6 Sol
LMArena WebDev: HTML16181485GPT-5.6 Sol
LMArena WebDev: from an image16091521GPT-5.6 Sol
Neither model has a result on the other 11 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for GPT-5.6 Sol and Kimi K2.6
BenchmarkGPT-5.6 SolKimi K2.6Leader
AA Intelligence Index47.027.0GPT-5.6 Sol
Epoch Capabilities Index162.8150.9GPT-5.6 Sol
Agentic workLike-for-likePublic boards, shown as published, kept out of the index142
Agentic work benchmarks for GPT-5.6 Sol and Kimi K2.6
BenchmarkGPT-5.6 SolKimi K2.6Leader
AA Agentic Index50.220.5GPT-5.6 Sol
Design Arena: agents building web apps12451268Kimi K2.6
Design Arena: agents building full-stack apps12611155GPT-5.6 Sol
Design Arena: agents building mobile apps12491156GPT-5.6 Sol
Design Arena: agents building Android apps12461166GPT-5.6 Sol
Design Arena: agents building Godot games12601120GPT-5.6 Sol
Design Arena: agents building games12671141GPT-5.6 Sol
Design Arena: HTML slides12861184GPT-5.6 Sol
Design Arena: PowerPoint slides12401128GPT-5.6 Sol
Design Arena: spreadsheetsNot measured1276Only Kimi K2.6 measured
LiveBench research54.5%Not measuredOnly GPT-5.6 Sol measured
LiveBench browser88.0%Not measuredOnly GPT-5.6 Sol measured
LiveBench long agentic48.5%Not measuredOnly GPT-5.6 Sol measured
SREBench (Vals AI)30.5%Not measuredOnly GPT-5.6 Sol measured
Finance Agent (Vals AI)53.8%44.9%GPT-5.6 Sol
Tax Agent Bench (Vals AI)31.1%12.4%GPT-5.6 Sol
Legal Research Bench (Vals AI)48.1%15.9%GPT-5.6 Sol
Excel Modeling Benchmark (Vals AI)72.3%57.9%GPT-5.6 Sol
BioMysteryBench (Vals AI)71.1%Not measuredOnly GPT-5.6 Sol measured
Terminal-Bench-Science (Vals AI)20.0%Not measuredOnly GPT-5.6 Sol measured
Vals Science Index41.5%Not measuredOnly GPT-5.6 Sol measured
Time Horizon Index (Vals AI)23.8%Not measuredOnly GPT-5.6 Sol measured
CUA-bench (Vals AI)8.3%Not measuredOnly GPT-5.6 Sol measured
τ²-Bench Telecom85.1%95.9%Kimi K2.6
OSWorld 2.027.3%4.6%GPT-5.6 Sol
BALROG60.0%Not measuredOnly GPT-5.6 Sol measured
PostTrainBench36.2%Not measuredOnly GPT-5.6 Sol measured
Vending-Bench 2$9,619$6,205GPT-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 index121
Reasoning benchmarks for GPT-5.6 Sol and Kimi K2.6
BenchmarkGPT-5.6 SolKimi K2.6Leader
GPQA Diamond95.2%89.1%GPT-5.6 Sol
LiveBench reasoning91.7%Not measuredOnly GPT-5.6 Sol measured
MysteryMechanism (Vals AI)33.3%Not measuredOnly GPT-5.6 Sol measured
MMMU Pro (Vals AI)88.8%86.3%GPT-5.6 Sol
GPQA Diamond (Artificial Analysis run)94.1%91.1%GPT-5.6 Sol
Humanity's Last Exam (Artificial Analysis run)49.5%37.5%GPT-5.6 Sol
GPQA Diamond (Epoch AI run)93.5%90.8%GPT-5.6 Sol
ARC-AGI97.5%Not measuredOnly GPT-5.6 Sol measured
ARC-AGI-292.5%Not measuredOnly GPT-5.6 Sol measured
SimpleBench64.8%Not measuredOnly GPT-5.6 Sol measured
Chess puzzles59.0%20.0%GPT-5.6 Sol
Mystery game puzzles58.0%18.0%GPT-5.6 Sol
EBR-bench44.8%2.4%GPT-5.6 Sol
LMArena Text: hard prompts14831470GPT-5.6 Sol
LMArena Text: expert15171491GPT-5.6 Sol
LMArena Text: hard prompts in English14771471GPT-5.6 Sol
LMArena Vision: diagrams13051298GPT-5.6 Sol
LMArena Vision: homework13051310Kimi K2.6
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index51
Math benchmarks for GPT-5.6 Sol and Kimi K2.6
BenchmarkGPT-5.6 SolKimi K2.6Leader
OTIS Mock AIME100.0%96.1%GPT-5.6 Sol
FrontierMath, tiers 1 to 389.1%57.2%GPT-5.6 Sol
FrontierMath, tier 482.9%25.6%GPT-5.6 Sol
ProofBench83.0%16.0%GPT-5.6 Sol
LMArena Text: math14731474Kimi K2.6
LMArena Text: mathematical work14961480GPT-5.6 Sol
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index83
Knowledge benchmarks for GPT-5.6 Sol and Kimi K2.6
BenchmarkGPT-5.6 SolKimi K2.6Leader
MMLU Pro89.1%87.6%GPT-5.6 Sol
LegalBench (Vals AI)87.0%84.7%GPT-5.6 Sol
CaseLaw (Vals AI)Not measured61.2%Only Kimi K2.6 measured
CorpFin (Vals AI)64.4%66.7%Kimi K2.6
TaxEval (Vals AI)74.8%74.7%GPT-5.6 Sol
MortgageTax (Vals AI)67.3%65.8%GPT-5.6 Sol
MedCode (Vals AI)44.0%40.1%GPT-5.6 Sol
SimpleQA Verified69.7%34.9%GPT-5.6 Sol
LMArena Text: science14551468Kimi K2.6
LMArena Text: medicine and healthcare14311457Kimi K2.6
LMArena Text: legal and government14761462GPT-5.6 Sol
LMArena Text: business and finance14571445GPT-5.6 Sol
Neither model has a result on the other 5 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for GPT-5.6 Sol and Kimi K2.6
BenchmarkGPT-5.6 SolKimi K2.6Leader
Design Arena: websites13211269GPT-5.6 Sol
Design Arena: UI components13381266GPT-5.6 Sol
Design Arena: game dev13681251GPT-5.6 Sol
Design Arena: data viz13231249GPT-5.6 Sol
Design Arena: 3D13851268GPT-5.6 Sol
Design Arena: all code categories13411272GPT-5.6 Sol
Design Arena: SVG13161181GPT-5.6 Sol
Design Arena: ASCII art13021164GPT-5.6 Sol
LiveBench design81.6%Not measuredOnly GPT-5.6 Sol measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index258
General benchmarks for GPT-5.6 Sol and Kimi K2.6
BenchmarkGPT-5.6 SolKimi K2.6Leader
LiveBench data analysis79.8%Not measuredOnly GPT-5.6 Sol measured
Public Benefits Bench (Vals AI)66.5%56.6%GPT-5.6 Sol
SAGE (Vals AI)52.6%50.2%GPT-5.6 Sol
MedScribe (Vals AI)85.2%78.2%GPT-5.6 Sol
Vals Multimodal Index72.6%56.4%GPT-5.6 Sol
IFBench72.7%76.0%Kimi K2.6
Long context reasoning (AA-LCR)84.0%81.0%GPT-5.6 Sol
DTBench95.7%90.9%GPT-5.6 Sol
LMCA58.5%37.3%GPT-5.6 Sol
Surface Evolver Bench93.1%Not measuredOnly GPT-5.6 Sol measured
Furniture assembly56.7%21.7%GPT-5.6 Sol
ExploitBenchNot measured18.4%Only Kimi K2.6 measured
LMArena Text14571455GPT-5.6 Sol
LMArena Text: instruction following14831451GPT-5.6 Sol
LMArena Text: creative writing14491434GPT-5.6 Sol
LMArena Vision12811282Kimi K2.6
LMArena Text: English14571460Kimi K2.6
LMArena Text: non-English14511446GPT-5.6 Sol
LMArena Text: Chinese15251520GPT-5.6 Sol
LMArena Text: German14761451GPT-5.6 Sol
LMArena Text: Japanese14721443GPT-5.6 Sol
LMArena Text: Korean14421427GPT-5.6 Sol
LMArena Text: French14721471GPT-5.6 Sol
LMArena Text: Spanish14431464Kimi K2.6
LMArena Text: Russian14711446GPT-5.6 Sol
LMArena Text: Polish14591438GPT-5.6 Sol
LMArena Text: multi-turn14611453GPT-5.6 Sol
LMArena Text: longer queries14811468GPT-5.6 Sol
LMArena Text: writing and language14621439GPT-5.6 Sol
LMArena Text: entertainment and media14501428GPT-5.6 Sol
LMArena Vision: English12801287Kimi K2.6
LMArena Vision: Chinese13131346Kimi K2.6
LMArena Vision: reading text12901291Kimi K2.6
LMArena Vision: humor12461280Kimi K2.6
LMArena Vision: creative writing12831273GPT-5.6 Sol
LMArena Document14831451GPT-5.6 Sol
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 K2.6
BenchmarkGPT-5.6 SolKimi K2.6Leader
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 K2.6$0.0024Fits in one request

Kimi K2.6 costs less

Repository review

50K input + 3K output tokens

GPT-5.6 Sol$0.260Fits in one request
Kimi K2.6$0.043Fits in one request

Kimi K2.6 costs less

Agent loop

200K input + 10K output tokens

GPT-5.6 Sol$1.00Fits in one request
Kimi K2.6$0.164Fits in one request

Kimi K2.6 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 K2.6
SpecificationOpenAI GPT-5.6 SolMoonshotAI Kimi K2.6
MakerOpenAIMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedJuly 9, 2026April 20, 2026
Context window1.05M262K
Input $/Mtok$4.00$0.65
Output $/Mtok$20.00$3.41
Coding index76.744.2
Independent measurements behind it21
Cost per solved task$1.20$0.35
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.6 Sol better than Kimi K2.6 for coding?

Pick GPT-5.6 Sol for coding: it scores 76.7 on the Vibe Coding Index against 44.2 for Kimi K2.6. Pick Kimi K2.6 when output tokens cost 5.9x less, or when a solved task costs $0.35 against $1.20.

Which is cheaper, GPT-5.6 Sol or Kimi K2.6?

GPT-5.6 Sol costs $4.00 per million input tokens and $20.00 per million output tokens; Kimi K2.6 costs $0.65 and $3.41. Per solved SWE-bench Verified task, GPT-5.6 Sol costs $1.20 and Kimi K2.6 $0.35.

Which has the bigger context window, GPT-5.6 Sol or Kimi K2.6?

GPT-5.6 Sol, with 1.05M tokens against 262K.

How many benchmarks is the GPT-5.6 Sol vs Kimi K2.6 comparison based on?

106 benchmarks have a result for both models as of October 21, 2026. GPT-5.6 Sol's coding index rests on 2 independent benchmarks and Kimi K2.6's on 1. Where only one model has a result, the page says so instead of naming a winner.

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