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GPT-6 Sol vs Kimi K3

GPT-6 Sol leads Kimi K3 on coding, 76.0 to 62.3 on the Vibe Coding Index, and GPT-6 Sol costs 1.5x less per output token ($10.00 vs $15.00 per million). Updated October 22, 2026; 88 benchmarks have a result for both.

Replace GPT-6 Sol Replace Kimi K3
GPT-6 SolOpenAI
Coding
76.0
Overall
74.6
Output $/M
$10.00
38
Kimi K3Moonshot AI
Coding
62.3
Overall
66.5
Output $/M
$15.00
49
vs boards won of 88 shared, 1 tied

GPT-6 Sol or Kimi K3: which to pick

Pick GPT-6 Sol for coding: it scores 76.0 on the Vibe Coding Index against 62.3 for Kimi K3, though on 5 benchmarks against 6.

Pick Kimi K3 for work measured by SciCode or LMArena Text: coding, where it leads.

Model AGPT-6 SolOpenAI76.0/1005 independent benchmarksNo cost per solved taskModel BKimi K3Moonshot AI62.3/1006 independent benchmarks$0.81 per solved task
Shared results
88
GPT-6 Sol only
13
Kimi K3 only
29
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-6 Sol 76.0 from 5 benchmarks, Kimi K3 62.3 from 6 benchmarks.
Widest category
Agentic work, 19.5 points apart on average over 14 shared benchmarks.
Widest single gap
LiveBench browser: GPT-6 Sol 92.0% against Kimi K3 16.0%, 76.0 points apart on a 0 to 100 scale.
Output price
GPT-6 Sol $10.00 against Kimi K3 $15.00 per million output tokens, 1.5x apart.
Context window
GPT-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-6 SolBarsKimi K3Ties
Coding1331 tie
Intelligence20
Agentic work77
Reasoning64
Math33
Knowledge15
Web design26
General421
All shared boards38491 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index133
Coding benchmarks for GPT-6 Sol and Kimi K3
BenchmarkGPT-6 SolKimi K3Leader
LiveBench coding93.1%59.3%GPT-6 Sol
LMArena WebDev16831655GPT-6 Sol
AA Coding IndexNot measured76.2Only Kimi K3 measured
LiveCodeBench (Vals AI)Not measured87.2%Only Kimi K3 measured
SWE-bench Verified (Vals AI)Not measured93.4%Only Kimi K3 measured
Terminal-Bench 4 (Vals AI)44.4%17.2%GPT-6 Sol
Vibe Code Bench (Vals AI)87.8%85.0%GPT-6 Sol
Code migration (Vals AI)57.2%16.1%GPT-6 Sol
ProgramBench (Vals AI)2.0%2.0%Tie
IOI (Vals AI)82.6%48.9%GPT-6 Sol
Terminal-Bench 2.1 (Vals AI)83.2%80.9%GPT-6 Sol
SWE-bench Multimodal (Vals AI)Not measured44.2%Only Kimi K3 measured
Vibe Code Bench 1-100 (Vals AI)Not measured18.2%Only Kimi K3 measured
CyberBench (Vals AI)78.0%75.2%GPT-6 Sol
SciCode57.6%59.5%Kimi K3
FrontierCode49.3%44.2%GPT-6 Sol
FrontierSWENot measured25.9%Only Kimi K3 measured
WeirdMLNot measured82.6%Only Kimi K3 measured
ALE-Bench2462.01524.5GPT-6 Sol
LMArena Text: coding14481508Kimi K3
LMArena Text: software and IT14331499Kimi K3
LMArena WebDev: React16851670GPT-6 Sol
LMArena WebDev: HTML16851644GPT-6 Sol
LMArena WebDev: from an image16601579GPT-6 Sol
Neither model has a result on the other 15 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for GPT-6 Sol and Kimi K3
BenchmarkGPT-6 SolKimi K3Leader
AA Intelligence Index47.643.6GPT-6 Sol
Epoch Capabilities Index163.7157.9GPT-6 Sol
Agentic workLike-for-likePublic boards, shown as published, kept out of the index77
Agentic work benchmarks for GPT-6 Sol and Kimi K3
BenchmarkGPT-6 SolKimi K3Leader
AA Agentic IndexNot measured50.0Only Kimi K3 measured
Design Arena: agents building web apps12311295Kimi K3
Design Arena: agents building full-stack apps12381315Kimi K3
Design Arena: agents building mobile apps12171269Kimi K3
Design Arena: agents building Android appsNot measured1253Only Kimi K3 measured
Design Arena: agents building Godot gamesNot measured1223Only Kimi K3 measured
Design Arena: agents building gamesNot measured1252Only Kimi K3 measured
Design Arena: HTML slidesNot measured1206Only Kimi K3 measured
Design Arena: PowerPoint slidesNot measured1247Only Kimi K3 measured
Design Arena: spreadsheetsNot measured1070Only Kimi K3 measured
LiveBench research69.3%79.0%Kimi K3
LiveBench browser92.0%16.0%GPT-6 Sol
LiveBench long agentic66.9%42.8%GPT-6 Sol
SREBench (Vals AI)30.5%Not measuredOnly GPT-6 Sol measured
Finance Agent (Vals AI)49.0%53.1%Kimi K3
Tax Agent Bench (Vals AI)15.0%33.4%Kimi K3
Legal Research Bench (Vals AI)28.9%46.1%Kimi K3
Harvey's Legal Agent Benchmark (Vals AI)Not measured12.9%Only Kimi K3 measured
Excel Modeling Benchmark (Vals AI)71.5%66.7%GPT-6 Sol
BioMysteryBench (Vals AI)74.8%72.6%GPT-6 Sol
Terminal-Bench-Science (Vals AI)30.0%1.4%GPT-6 Sol
Vals Science Index45.0%Not measuredOnly GPT-6 Sol measured
Time Horizon Index (Vals AI)Not measured10.5%Only Kimi K3 measured
APEX-Agents54.3%47.8%GPT-6 Sol
PostTrainBenchNot measured32.0%Only Kimi K3 measured
SpireClimb7.5%Not measuredOnly GPT-6 Sol measured
Vending-Bench 2$14,428$5,165GPT-6 Sol
Neither model has a result on the other 14 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index64
Reasoning benchmarks for GPT-6 Sol and Kimi K3
BenchmarkGPT-6 SolKimi K3Leader
GPQA DiamondNot measured92.9%Only Kimi K3 measured
LiveBench reasoning88.7%90.7%Kimi K3
MysteryMechanism (Vals AI)30.2%Not measuredOnly GPT-6 Sol measured
MMMU Pro (Vals AI)Not measured88.2%Only Kimi K3 measured
GPQA Diamond (Artificial Analysis run)Not measured93.5%Only Kimi K3 measured
Humanity's Last Exam (Artificial Analysis run)47.9%46.9%GPT-6 Sol
GPQA Diamond (Epoch AI run)94.3%93.1%GPT-6 Sol
ARC-AGI95.5%94.5%GPT-6 Sol
ARC-AGI-289.6%60.4%GPT-6 Sol
SimpleBenchNot measured60.7%Only Kimi K3 measured
Chess puzzles56.0%37.0%GPT-6 Sol
Mystery game puzzles56.0%26.0%GPT-6 Sol
EBR-bench53.3%Not measuredOnly GPT-6 Sol measured
LMArena Text: hard prompts14221495Kimi K3
LMArena Text: expert14371520Kimi K3
LMArena Text: hard prompts in English14201496Kimi K3
LMArena Vision: diagrams1270Not measuredOnly GPT-6 Sol measured
LMArena Vision: homework1286Not measuredOnly GPT-6 Sol measured
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index33
Math benchmarks for GPT-6 Sol and Kimi K3
BenchmarkGPT-6 SolKimi K3Leader
OTIS Mock AIME100.0%97.2%GPT-6 Sol
FrontierMath, tiers 1 to 389.8%72.2%GPT-6 Sol
FrontierMath, tier 490.0%39.0%GPT-6 Sol
ProofBench83.0%87.0%Kimi K3
LMArena Text: math14071494Kimi K3
LMArena Text: mathematical work14241505Kimi K3
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index15
Knowledge benchmarks for GPT-6 Sol and Kimi K3
BenchmarkGPT-6 SolKimi K3Leader
MMLU ProNot measured88.0%Only Kimi K3 measured
LegalBench (Vals AI)Not measured86.2%Only Kimi K3 measured
CorpFin (Vals AI)Not measured71.6%Only Kimi K3 measured
TaxEval (Vals AI)Not measured75.7%Only Kimi K3 measured
MortgageTax (Vals AI)Not measured66.3%Only Kimi K3 measured
MedCode (Vals AI)47.1%49.4%Kimi K3
SimpleQA Verified60.7%50.6%GPT-6 Sol
LMArena Text: science13891508Kimi K3
LMArena Text: medicine and healthcare13661489Kimi K3
LMArena Text: legal and government13961503Kimi K3
LMArena Text: business and finance13801470Kimi K3
FACTS Benchmark Suite72.5%Not measuredOnly GPT-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 index26
Web design benchmarks for GPT-6 Sol and Kimi K3
BenchmarkGPT-6 SolKimi K3Leader
Design Arena: websites12921334Kimi K3
Design Arena: UI components12901341Kimi K3
Design Arena: game dev13111358Kimi K3
Design Arena: data viz12691351Kimi K3
Design Arena: 3D13141387Kimi K3
Design Arena: all code categories13001360Kimi K3
Design Arena: SVG13151302GPT-6 Sol
Design Arena: ASCII art1222Not measuredOnly GPT-6 Sol measured
LiveBench design82.2%77.2%GPT-6 Sol
GeneralLike-for-likePublic boards, shown as published, kept out of the index421
General benchmarks for GPT-6 Sol and Kimi K3
BenchmarkGPT-6 SolKimi K3Leader
Vals IndexNot measured53.0%Only Kimi K3 measured
LiveBench data analysis81.2%78.7%GPT-6 Sol
Public Benefits Bench (Vals AI)56.6%68.2%Kimi K3
SAGE (Vals AI)44.8%52.8%Kimi K3
MedScribe (Vals AI)82.0%88.0%Kimi K3
Vals Multimodal IndexNot measured73.4%Only Kimi K3 measured
Long context reasoning (AA-LCR)83.7%88.7%Kimi K3
DTBench97.3%91.2%GPT-6 Sol
LMCA59.1%52.7%GPT-6 Sol
Surface Evolver BenchNot measured95.0%Only Kimi K3 measured
Furniture assembly58.3%34.2%GPT-6 Sol
LMArena Text13981476Kimi K3
LMArena Text: instruction following14131485Kimi K3
LMArena Text: creative writing13781457Kimi K3
LMArena Vision1240Not measuredOnly GPT-6 Sol measured
LMArena Text: English13961481Kimi K3
LMArena Text: non-English13881466Kimi K3
LMArena Text: Chinese14121529Kimi K3
LMArena Text: German13791490Kimi K3
LMArena Text: Japanese13771494Kimi K3
LMArena Text: Korean13361460Kimi K3
LMArena Text: French13991492Kimi K3
LMArena Text: Spanish13871472Kimi K3
LMArena Text: Russian14021485Kimi K3
LMArena Text: Polish13721458Kimi K3
LMArena Text: multi-turn14141489Kimi K3
LMArena Text: longer queries14161494Kimi K3
LMArena Text: writing and language13891471Kimi K3
LMArena Text: entertainment and media13731453Kimi K3
LMArena Vision: English1229Not measuredOnly GPT-6 Sol measured
LMArena Vision: reading text1258Not measuredOnly GPT-6 Sol measured
LMArena Vision: creative writing1219Not measuredOnly GPT-6 Sol measured
Neither model has a result on the other 14 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-6 Sol and Kimi K3
BenchmarkGPT-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-6 Sol$0.0070Fits in one request
Kimi K3$0.011Fits in one request

GPT-6 Sol costs less

Repository review

50K input + 3K output tokens

GPT-6 Sol$0.130Fits in one request
Kimi K3$0.195Fits in one request

GPT-6 Sol costs less

Agent loop

200K input + 10K output tokens

GPT-6 Sol$0.500Fits in one request
Kimi K3$0.750Fits in one request

GPT-6 Sol 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-6 Sol and Kimi K3
SpecificationOpenAI GPT-6 SolMoonshotAI Kimi K3
MakerOpenAIMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedSeptember 22, 2026July 16, 2026
Context window1.05M1.05M
Input $/Mtok$2.00$3.00
Output $/Mtok$10.00$15.00
Coding index76.062.3
Independent measurements behind it56
Cost per solved taskNot computable$0.81
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-6 Sol better than Kimi K3 for coding?

Pick GPT-6 Sol for coding: it scores 76.0 on the Vibe Coding Index against 62.3 for Kimi K3, though on 5 benchmarks against 6. Pick Kimi K3 for work measured by SciCode or LMArena Text: coding, where it leads.

Which is cheaper, GPT-6 Sol or Kimi K3?

GPT-6 Sol costs $2.00 per million input tokens and $10.00 per million output tokens; Kimi K3 costs $3.00 and $15.00. Cost per solved task is known for Kimi K3 only.

Which has the bigger context window, GPT-6 Sol or Kimi K3?

GPT-6 Sol, with 1.05M tokens against 1.05M.

How many benchmarks is the GPT-6 Sol vs Kimi K3 comparison based on?

88 benchmarks have a result for both models as of October 22, 2026. GPT-6 Sol's coding index rests on 5 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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<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/gpt-6-sol-vs-kimi-k3">LLMBenchmark.ai, GPT-6 Sol vs Kimi K3</a></p>