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GPT-6 Sol vs Kimi K2.5

GPT-6 Sol leads Kimi K2.5 on coding, 76.0 to 38.6 on the Vibe Coding Index, and Kimi K2.5 costs 3.5x less per output token ($2.85 vs $10.00 per million). Updated October 22, 2026; 67 benchmarks have a result for both.

Replace GPT-6 Sol Replace Kimi K2.5
GPT-6 SolOpenAI
Coding
76.0
Overall
74.6
Output $/M
$10.00
32
Kimi K2.5Moonshot AI
Coding
38.6
Overall
44.8
Output $/M
$2.85
35
vs boards won of 67 shared

GPT-6 Sol or Kimi K2.5: which to pick

Pick GPT-6 Sol for coding: it scores 76.0 on the Vibe Coding Index against 38.6 for Kimi K2.5.

Pick Kimi K2.5 for output tokens 3.5x cheaper ($2.85 vs $10.00 per million) and work measured by LMArena Text: coding or LMArena Text: software and IT, where it leads.

Model AGPT-6 SolOpenAI76.0/1005 independent benchmarksNo cost per solved taskModel BKimi K2.5Moonshot AI38.6/1003 independent benchmarks$0.24 per solved task
Shared results
67
GPT-6 Sol only
34
Kimi K2.5 only
32
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 K2.5 38.6 from 3 benchmarks.
Widest category
Coding, 34.8 points apart on average over 10 shared benchmarks.
Widest single gap
Vending-Bench 2: GPT-6 Sol $14,428 against Kimi K2.5 $1,198, 82.7 points apart on a 0 to 100 scale.
Output price
GPT-6 Sol $10.00 against Kimi K2.5 $2.85 per million output tokens, 3.5x apart.
Context window
GPT-6 Sol takes 1.05M tokens, Kimi K2.5 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-6 SolBarsKimi K2.5Ties
Coding82
Intelligence20
Agentic work70
Reasoning35
Math02
Knowledge24
Web design80
General222
All shared boards3235
CodingLike-for-likeSix of these boards feed the Vibe Coding Index82
Coding benchmarks for GPT-6 Sol and Kimi K2.5
BenchmarkGPT-6 SolKimi K2.5Leader
SWE-bench VerifiedNot measured70.8%Only Kimi K2.5 measured
SWE-bench MultilingualNot measured67.3%Only Kimi K2.5 measured
LiveBench coding93.1%Not measuredOnly GPT-6 Sol measured
LMArena WebDev16831437GPT-6 Sol
AA Coding IndexNot measured46.8Only Kimi K2.5 measured
LiveCodeBench (Vals AI)Not measured83.9%Only Kimi K2.5 measured
SWE-bench Verified (Vals AI)Not measured70.0%Only Kimi K2.5 measured
Terminal-Bench 4 (Vals AI)44.4%Not measuredOnly GPT-6 Sol measured
Vibe Code Bench (Vals AI)87.8%17.5%GPT-6 Sol
Code migration (Vals AI)57.2%7.0%GPT-6 Sol
ProgramBench (Vals AI)2.0%Not measuredOnly GPT-6 Sol measured
IOI (Vals AI)82.6%Not measuredOnly GPT-6 Sol measured
Terminal-Bench 2.1 (Vals AI)83.2%42.0%GPT-6 Sol
CyberBench (Vals AI)78.0%Not measuredOnly GPT-6 Sol measured
SciCode57.6%Not measuredOnly GPT-6 Sol measured
Terminal-Bench Hard (Artificial Analysis run)Not measured34.8%Only Kimi K2.5 measured
Terminal-BenchNot measured43.2%Only Kimi K2.5 measured
FrontierCode49.3%Not measuredOnly GPT-6 Sol measured
WeirdMLNot measured45.6%Only Kimi K2.5 measured
ALE-Bench2462.0821.6GPT-6 Sol
LMArena Text: coding14481483Kimi K2.5
LMArena Text: software and IT14331471Kimi K2.5
LMArena WebDev: React16851429GPT-6 Sol
LMArena WebDev: HTML16851426GPT-6 Sol
LMArena WebDev: from an image16601439GPT-6 Sol
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for GPT-6 Sol and Kimi K2.5
BenchmarkGPT-6 SolKimi K2.5Leader
AA Intelligence Index47.623.5GPT-6 Sol
Epoch Capabilities Index163.7148.1GPT-6 Sol
Agentic workLike-for-likePublic boards, shown as published, kept out of the index70
Agentic work benchmarks for GPT-6 Sol and Kimi K2.5
BenchmarkGPT-6 SolKimi K2.5Leader
Design Arena: agents building web apps12311136GPT-6 Sol
Design Arena: agents building full-stack apps12381114GPT-6 Sol
Design Arena: agents building mobile apps12171147GPT-6 Sol
Design Arena: agents building Android appsNot measured1118Only Kimi K2.5 measured
Design Arena: agents building Godot gamesNot measured1219Only Kimi K2.5 measured
LiveBench research69.3%Not measuredOnly GPT-6 Sol measured
LiveBench browser92.0%Not measuredOnly GPT-6 Sol measured
LiveBench long agentic66.9%Not measuredOnly GPT-6 Sol measured
SREBench (Vals AI)30.5%Not measuredOnly GPT-6 Sol measured
Finance Agent (Vals AI)49.0%35.8%GPT-6 Sol
Tax Agent Bench (Vals AI)15.0%Not measuredOnly GPT-6 Sol measured
Legal Research Bench (Vals AI)28.9%15.9%GPT-6 Sol
Excel Modeling Benchmark (Vals AI)71.5%28.5%GPT-6 Sol
BioMysteryBench (Vals AI)74.8%Not measuredOnly GPT-6 Sol measured
Terminal-Bench-Science (Vals AI)30.0%Not measuredOnly GPT-6 Sol measured
Vals Science Index45.0%Not measuredOnly GPT-6 Sol measured
τ²-Bench TelecomNot measured95.9%Only Kimi K2.5 measured
APEX-Agents54.3%Not measuredOnly GPT-6 Sol measured
OSWorldNot measured63.3%Only Kimi K2.5 measured
SpireClimb7.5%Not measuredOnly GPT-6 Sol measured
Vending-Bench 2$14,428$1,198GPT-6 Sol
Neither model has a result on the other 20 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index35
Reasoning benchmarks for GPT-6 Sol and Kimi K2.5
BenchmarkGPT-6 SolKimi K2.5Leader
GPQA DiamondNot measured84.1%Only Kimi K2.5 measured
LiveBench reasoning88.7%Not measuredOnly GPT-6 Sol measured
MysteryMechanism (Vals AI)30.2%Not measuredOnly GPT-6 Sol measured
MMMU Pro (Vals AI)Not measured84.3%Only Kimi K2.5 measured
GPQA Diamond (Artificial Analysis run)Not measured87.9%Only Kimi K2.5 measured
Humanity's Last Exam (Artificial Analysis run)47.9%30.7%GPT-6 Sol
GPQA Diamond (Epoch AI run)94.3%Not measuredOnly GPT-6 Sol measured
ARC-AGI95.5%65.3%GPT-6 Sol
ARC-AGI-289.6%11.8%GPT-6 Sol
SimpleBenchNot measured46.8%Only Kimi K2.5 measured
Chess puzzles56.0%Not measuredOnly GPT-6 Sol measured
Mystery game puzzles56.0%Not measuredOnly GPT-6 Sol measured
EBR-bench53.3%Not measuredOnly GPT-6 Sol measured
LMArena Text: hard prompts14221453Kimi K2.5
LMArena Text: expert14371466Kimi K2.5
LMArena Text: hard prompts in English14201460Kimi K2.5
LMArena Vision: diagrams12701282Kimi K2.5
LMArena Vision: homework12861297Kimi K2.5
Kagi LLM BenchmarkNot measured78.5%Only Kimi K2.5 measured
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index02
Math benchmarks for GPT-6 Sol and Kimi K2.5
BenchmarkGPT-6 SolKimi K2.5Leader
AIMENot measured95.6%Only Kimi K2.5 measured
OTIS Mock AIME100.0%Not measuredOnly GPT-6 Sol measured
FrontierMath, tiers 1 to 389.8%Not measuredOnly GPT-6 Sol measured
FrontierMath, tier 490.0%Not measuredOnly GPT-6 Sol measured
ProofBench83.0%Not measuredOnly GPT-6 Sol measured
LMArena Text: math14071470Kimi K2.5
LMArena Text: mathematical work14241473Kimi K2.5
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index24
Knowledge benchmarks for GPT-6 Sol and Kimi K2.5
BenchmarkGPT-6 SolKimi K2.5Leader
MMLU ProNot measured85.9%Only Kimi K2.5 measured
CaseLaw (Vals AI)Not measured58.7%Only Kimi K2.5 measured
CorpFin (Vals AI)Not measured68.3%Only Kimi K2.5 measured
TaxEval (Vals AI)Not measured74.2%Only Kimi K2.5 measured
MortgageTax (Vals AI)Not measured66.5%Only Kimi K2.5 measured
MedQA (Vals AI)Not measured94.4%Only Kimi K2.5 measured
MedCode (Vals AI)47.1%39.3%GPT-6 Sol
SimpleQA Verified60.7%34.3%GPT-6 Sol
LMArena Text: science13891459Kimi K2.5
LMArena Text: medicine and healthcare13661448Kimi K2.5
LMArena Text: legal and government13961441Kimi K2.5
LMArena Text: business and finance13801427Kimi K2.5
FACTS Benchmark Suite72.5%Not measuredOnly GPT-6 Sol measured
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-6 Sol and Kimi K2.5
BenchmarkGPT-6 SolKimi K2.5Leader
Design Arena: websites12921248GPT-6 Sol
Design Arena: UI components12901234GPT-6 Sol
Design Arena: game dev13111206GPT-6 Sol
Design Arena: data viz12691219GPT-6 Sol
Design Arena: 3D13141204GPT-6 Sol
Design Arena: all code categories13001236GPT-6 Sol
Design Arena: SVG13151149GPT-6 Sol
Design Arena: ASCII art12221166GPT-6 Sol
LiveBench design82.2%Not measuredOnly GPT-6 Sol measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index222
General benchmarks for GPT-6 Sol and Kimi K2.5
BenchmarkGPT-6 SolKimi K2.5Leader
LiveBench data analysis81.2%Not measuredOnly GPT-6 Sol measured
Public Benefits Bench (Vals AI)56.6%Not measuredOnly GPT-6 Sol measured
SAGE (Vals AI)44.8%49.9%Kimi K2.5
MedScribe (Vals AI)82.0%76.4%GPT-6 Sol
IFBenchNot measured70.2%Only Kimi K2.5 measured
Long context reasoning (AA-LCR)83.7%78.0%GPT-6 Sol
DTBench97.3%Not measuredOnly GPT-6 Sol measured
LMCA59.1%Not measuredOnly GPT-6 Sol measured
Fiction.LiveBenchNot measured86.1%Only Kimi K2.5 measured
CL-benchNot measured19.3%Only Kimi K2.5 measured
Furniture assembly58.3%Not measuredOnly GPT-6 Sol measured
CL-bench LifeNot measured13.2%Only Kimi K2.5 measured
LMArena Text13981445Kimi K2.5
LMArena Text: instruction following14131431Kimi K2.5
LMArena Text: creative writing13781422Kimi K2.5
LMArena Vision12401269Kimi K2.5
LMArena Text: English13961453Kimi K2.5
LMArena Text: non-English13881433Kimi K2.5
LMArena Text: Chinese14121494Kimi K2.5
LMArena Text: German13791441Kimi K2.5
LMArena Text: Japanese13771423Kimi K2.5
LMArena Text: Korean13361412Kimi K2.5
LMArena Text: French13991454Kimi K2.5
LMArena Text: Spanish13871450Kimi K2.5
LMArena Text: Russian14021435Kimi K2.5
LMArena Text: Polish13721445Kimi K2.5
LMArena Text: multi-turn14141444Kimi K2.5
LMArena Text: longer queries14161445Kimi K2.5
LMArena Text: writing and language13891425Kimi K2.5
LMArena Text: entertainment and media13731417Kimi K2.5
LMArena Vision: English12291274Kimi K2.5
LMArena Vision: ChineseNot measured1328Only Kimi K2.5 measured
LMArena Vision: reading text12581276Kimi K2.5
LMArena Vision: humorNot measured1284Only Kimi K2.5 measured
LMArena Vision: captioningNot measured1257Only Kimi K2.5 measured
LMArena Vision: recognizing thingsNot measured1285Only Kimi K2.5 measured
LMArena Vision: creative writing12191269Kimi K2.5
Neither model has a result on the other 9 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 K2.5
BenchmarkGPT-6 SolKimi K2.5Leader
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 K2.5$0.0020Fits in one request

Kimi K2.5 costs less

Repository review

50K input + 3K output tokens

GPT-6 Sol$0.130Fits in one request
Kimi K2.5$0.035Fits in one request

Kimi K2.5 costs less

Agent loop

200K input + 10K output tokens

GPT-6 Sol$0.500Fits in one request
Kimi K2.5$0.135Fits in one request

Kimi K2.5 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 K2.5
SpecificationOpenAI GPT-6 SolMoonshotAI Kimi K2.5
MakerOpenAIMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedSeptember 22, 2026January 27, 2026
Context window1.05M262K
Input $/Mtok$2.00$0.532
Output $/Mtok$10.00$2.85
Coding index76.038.6
Independent measurements behind it53
Cost per solved taskNot computable$0.24
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-6 Sol better than Kimi K2.5 for coding?

Pick GPT-6 Sol for coding: it scores 76.0 on the Vibe Coding Index against 38.6 for Kimi K2.5. Pick Kimi K2.5 for output tokens 3.5x cheaper ($2.85 vs $10.00 per million) and work measured by LMArena Text: coding or LMArena Text: software and IT, where it leads.

Which is cheaper, GPT-6 Sol or Kimi K2.5?

GPT-6 Sol costs $2.00 per million input tokens and $10.00 per million output tokens; Kimi K2.5 costs $0.532 and $2.85. Cost per solved task is known for Kimi K2.5 only.

Which has the bigger context window, GPT-6 Sol or Kimi K2.5?

GPT-6 Sol, with 1.05M tokens against 262K.

How many benchmarks is the GPT-6 Sol vs Kimi K2.5 comparison based on?

67 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 K2.5's on 3. Where only one model has a result, the page says so instead of naming a winner.

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