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GPT-5 Nano vs Kimi K2.6

Kimi K2.6 leads GPT-5 Nano on the Artificial Analysis Intelligence Index, 27.0 to 13.0, and GPT-5 Nano costs 10.0x less per output token ($0.40 vs $4.00 per million). Updated October 22, 2026; 70 benchmarks have a result for both.

Replace GPT-5 Nano Replace Kimi K2.6
GPT-5 NanoOpenAI
Coding
No data
Overall
35.6
Output $/M
$0.40
1
Kimi K2.6Moonshot AI
Coding
52.1
Overall
60.5
Output $/M
$4.00
69
vs boards won of 70 shared

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

Only Kimi K2.6 has a coding score, 52.1 on the Vibe Coding Index; GPT-5 Nano has none, so the two cannot be ranked on coding.

Pick GPT-5 Nano for output tokens 10.0x cheaper ($0.40 vs $4.00 per million) and a lower cost per solved task ($0.109 against $0.35).

Model AGPT-5 NanoOpenAINot benchmarkedNo coding benchmark$0.109 per solved taskModel BKimi K2.6Moonshot AI52.1/1003 independent benchmarks$0.35 per solved task
Shared results
70
GPT-5 Nano only
17
Kimi K2.6 only
39
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 Nano not benchmarked, Kimi K2.6 52.1 from 3 benchmarks.
Widest category
Agentic work, 59.4 points apart on average over 1 shared benchmark.
Widest single gap
τ²-Bench Telecom: GPT-5 Nano 36.5% against Kimi K2.6 95.9%, 59.4 points apart on a 0 to 100 scale.
Output price
GPT-5 Nano $0.40 against Kimi K2.6 $4.00 per million output tokens, 10.0x apart.
Context window
GPT-5 Nano takes 400K 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 NanoBarsKimi K2.6Ties
Coding05
Intelligence02
Agentic work01
Reasoning111
Math06
Knowledge011
Web design06
General027
All shared boards169
CodingLike-for-likeSix of these boards feed the Vibe Coding Index05
Coding benchmarks for GPT-5 Nano and Kimi K2.6
BenchmarkGPT-5 NanoKimi K2.6Leader
SWE-bench Verified34.8%Not measuredOnly GPT-5 Nano measured
LMArena WebDevNot measured1509Only Kimi K2.6 measured
AA Coding IndexNot measured61.8Only Kimi K2.6 measured
LiveCodeBench (Vals AI)70.2%86.8%Kimi K2.6
SWE-bench Verified (Vals AI)Not measured76.2%Only Kimi K2.6 measured
Vibe Code Bench (Vals AI)Not measured37.9%Only Kimi K2.6 measured
Code migration (Vals AI)Not measured27.8%Only Kimi K2.6 measured
ProgramBench (Vals AI)Not measured0.0%Only Kimi K2.6 measured
Terminal-Bench 2.1 (Vals AI)Not measured53.6%Only Kimi K2.6 measured
LiveCodeBench (Artificial Analysis run)78.9%Not measuredOnly GPT-5 Nano measured
SciCodeNot measured51.5%Only Kimi K2.6 measured
Terminal-Bench Hard (Artificial Analysis run)17.4%43.9%Kimi K2.6
Terminal-Bench21.8%Not measuredOnly GPT-5 Nano measured
WeirdML38.1%55.9%Kimi K2.6
ALE-BenchNot measured1092.7Only Kimi K2.6 measured
LMArena Text: coding13511489Kimi K2.6
LMArena Text: software and IT13451484Kimi K2.6
LMArena WebDev: ReactNot measured1505Only Kimi K2.6 measured
LMArena WebDev: HTMLNot measured1485Only Kimi K2.6 measured
LMArena WebDev: from an imageNot measured1521Only Kimi K2.6 measured
Neither model has a result on the other 19 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for GPT-5 Nano and Kimi K2.6
BenchmarkGPT-5 NanoKimi K2.6Leader
AA Intelligence Index13.027.0Kimi K2.6
Epoch Capabilities Index139.2150.9Kimi K2.6
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
Agentic work benchmarks for GPT-5 Nano and Kimi K2.6
BenchmarkGPT-5 NanoKimi K2.6Leader
AA Agentic IndexNot measured20.5Only Kimi K2.6 measured
Design Arena: agents building web appsNot measured1268Only Kimi K2.6 measured
Design Arena: agents building full-stack appsNot measured1155Only Kimi K2.6 measured
Design Arena: agents building mobile appsNot measured1156Only Kimi K2.6 measured
Design Arena: agents building Android appsNot measured1161Only Kimi K2.6 measured
Design Arena: agents building Godot gamesNot measured1120Only Kimi K2.6 measured
Design Arena: agents building gamesNot measured1141Only Kimi K2.6 measured
Design Arena: HTML slidesNot measured1135Only Kimi K2.6 measured
Design Arena: PowerPoint slidesNot measured1103Only Kimi K2.6 measured
Design Arena: spreadsheetsNot measured1276Only Kimi K2.6 measured
Finance Agent (Vals AI)Not measured44.9%Only Kimi K2.6 measured
Tax Agent Bench (Vals AI)Not measured12.4%Only Kimi K2.6 measured
Legal Research Bench (Vals AI)Not measured15.9%Only Kimi K2.6 measured
Excel Modeling Benchmark (Vals AI)Not measured57.9%Only Kimi K2.6 measured
τ²-Bench Telecom36.5%95.9%Kimi K2.6
OSWorld 2.0Not measured4.6%Only Kimi K2.6 measured
Vending-Bench 2Not measured$6,205Only Kimi K2.6 measured
Berkeley Function Calling Leaderboard (BFCL)51.4%Not measuredOnly GPT-5 Nano measured
Neither model has a result on the other 23 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index111
Reasoning benchmarks for GPT-5 Nano and Kimi K2.6
BenchmarkGPT-5 NanoKimi K2.6Leader
GPQA Diamond63.4%89.1%Kimi K2.6
MMMU Pro (Vals AI)70.9%86.3%Kimi K2.6
GPQA Diamond (Artificial Analysis run)67.6%91.1%Kimi K2.6
Humanity's Last Exam (Artificial Analysis run)9.5%37.5%Kimi K2.6
GPQA Diamond (Epoch AI run)69.4%90.8%Kimi K2.6
ARC-AGI20.7%Not measuredOnly GPT-5 Nano measured
ARC-AGI-22.6%Not measuredOnly GPT-5 Nano measured
Chess puzzles22.0%20.0%GPT-5 Nano
Mystery game puzzles9.0%18.0%Kimi K2.6
EBR-benchNot measured2.4%Only Kimi K2.6 measured
VPCT37.2%Not measuredOnly GPT-5 Nano measured
LMArena Text: hard prompts13281470Kimi K2.6
LMArena Text: expert13211491Kimi K2.6
LMArena Text: hard prompts in English13381471Kimi K2.6
LMArena Vision: diagrams11411298Kimi K2.6
LMArena Vision: homework11571310Kimi K2.6
Kagi LLM Benchmark62.2%Not measuredOnly GPT-5 Nano measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index06
Math benchmarks for GPT-5 Nano and Kimi K2.6
BenchmarkGPT-5 NanoKimi K2.6Leader
AIME81.2%Not measuredOnly GPT-5 Nano measured
MATH 500 (Vals AI)93.8%Not measuredOnly GPT-5 Nano measured
MGSM (Vals AI)89.3%Not measuredOnly GPT-5 Nano measured
AA Math Index83.7Not measuredOnly GPT-5 Nano measured
AIME 2025 (Artificial Analysis run)83.7%Not measuredOnly GPT-5 Nano measured
OTIS Mock AIME81.1%96.1%Kimi K2.6
FrontierMath, tiers 1 to 320.0%57.2%Kimi K2.6
FrontierMath, tier 42.4%25.6%Kimi K2.6
ProofBench12.0%16.0%Kimi K2.6
MATH level 595.2%Not measuredOnly GPT-5 Nano measured
LMArena Text: math13171474Kimi K2.6
LMArena Text: mathematical work13261480Kimi K2.6
Neither model has a result on the other 1 board here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index011
Knowledge benchmarks for GPT-5 Nano and Kimi K2.6
BenchmarkGPT-5 NanoKimi K2.6Leader
MMLU Pro76.1%87.6%Kimi K2.6
LegalBench (Vals AI)50.1%84.7%Kimi K2.6
CaseLaw (Vals AI)52.6%61.2%Kimi K2.6
CorpFin (Vals AI)Not measured66.7%Only Kimi K2.6 measured
TaxEval (Vals AI)67.4%74.7%Kimi K2.6
MortgageTax (Vals AI)53.6%65.8%Kimi K2.6
MedQA (Vals AI)93.3%Not measuredOnly GPT-5 Nano measured
MedCode (Vals AI)30.4%40.1%Kimi K2.6
MMLU Pro (Artificial Analysis run)78.0%Not measuredOnly GPT-5 Nano measured
SimpleQA Verified11.7%34.9%Kimi K2.6
LMArena Text: science13181468Kimi K2.6
LMArena Text: medicine and healthcare13351457Kimi K2.6
LMArena Text: legal and government12981462Kimi K2.6
LMArena Text: business and finance13111445Kimi K2.6
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index06
Web design benchmarks for GPT-5 Nano and Kimi K2.6
BenchmarkGPT-5 NanoKimi K2.6Leader
Design Arena: websites11011268Kimi K2.6
Design Arena: UI components10641263Kimi K2.6
Design Arena: game dev10441250Kimi K2.6
Design Arena: data viz10561249Kimi K2.6
Design Arena: 3D9651267Kimi K2.6
Design Arena: all code categories10841271Kimi K2.6
Design Arena: SVGNot measured1181Only Kimi K2.6 measured
Design Arena: ASCII artNot measured1165Only Kimi K2.6 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index027
General benchmarks for GPT-5 Nano and Kimi K2.6
BenchmarkGPT-5 NanoKimi K2.6Leader
Public Benefits Bench (Vals AI)Not measured56.6%Only Kimi K2.6 measured
SAGE (Vals AI)30.4%50.2%Kimi K2.6
MedScribe (Vals AI)72.9%78.2%Kimi K2.6
Vals Multimodal IndexNot measured56.4%Only Kimi K2.6 measured
IFBench67.6%76.0%Kimi K2.6
Long context reasoning (AA-LCR)45.0%81.0%Kimi K2.6
DTBench62.7%90.9%Kimi K2.6
LMCA7.9%37.3%Kimi K2.6
Fiction.LiveBench44.4%Not measuredOnly GPT-5 Nano measured
Furniture assemblyNot measured21.7%Only Kimi K2.6 measured
ExploitBenchNot measured18.4%Only Kimi K2.6 measured
LMArena Text13201455Kimi K2.6
LMArena Text: instruction following13061451Kimi K2.6
LMArena Text: creative writing12491434Kimi K2.6
LMArena Vision11591282Kimi K2.6
LMArena Text: English13211460Kimi K2.6
LMArena Text: non-English13131446Kimi K2.6
LMArena Text: Chinese13561520Kimi K2.6
LMArena Text: German13271451Kimi K2.6
LMArena Text: Japanese12271443Kimi K2.6
LMArena Text: Korean12691427Kimi K2.6
LMArena Text: FrenchNot measured1471Only Kimi K2.6 measured
LMArena Text: Spanish13601464Kimi K2.6
LMArena Text: Russian12961446Kimi K2.6
LMArena Text: Polish13141438Kimi K2.6
LMArena Text: multi-turn13111453Kimi K2.6
LMArena Text: longer queries13121468Kimi K2.6
LMArena Text: writing and language12831439Kimi K2.6
LMArena Text: entertainment and media12681428Kimi K2.6
LMArena Vision: English11701287Kimi K2.6
LMArena Vision: Chinese11761346Kimi K2.6
LMArena Vision: reading text11521291Kimi K2.6
LMArena Vision: humor11101280Kimi K2.6
LMArena Vision: creative writingNot measured1273Only Kimi K2.6 measured
LMArena DocumentNot measured1451Only Kimi K2.6 measured
Neither model has a result on the other 11 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-5 Nano and Kimi K2.6
BenchmarkGPT-5 NanoKimi 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 Nano$0.0003Fits in one request
Kimi K2.6$0.0029Fits in one request

GPT-5 Nano costs less

Repository review

50K input + 3K output tokens

GPT-5 Nano$0.0037Fits in one request
Kimi K2.6$0.059Fits in one request

GPT-5 Nano costs less

Agent loop

200K input + 10K output tokens

GPT-5 Nano$0.014Fits in one request
Kimi K2.6$0.230Fits in one request

GPT-5 Nano 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 Nano and Kimi K2.6
SpecificationOpenAI GPT-5 NanoMoonshotAI Kimi K2.6
MakerOpenAIMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedAugust 7, 2025April 20, 2026
Context window400K262K
Input $/Mtok$0.05$0.95
Output $/Mtok$0.40$4.00
Coding indexNot benchmarked52.1
Independent measurements behind it03
Cost per solved task$0.109$0.35
SourceOpenRouter listingOpenRouter listing

Questions

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

Only Kimi K2.6 has a coding score, 52.1 on the Vibe Coding Index; GPT-5 Nano has none, so the two cannot be ranked on coding. Pick GPT-5 Nano for output tokens 10.0x cheaper ($0.40 vs $4.00 per million) and a lower cost per solved task ($0.109 against $0.35).

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

GPT-5 Nano costs $0.05 per million input tokens and $0.40 per million output tokens; Kimi K2.6 costs $0.95 and $4.00. Per solved SWE-bench Verified task, GPT-5 Nano costs $0.109 and Kimi K2.6 $0.35.

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

GPT-5 Nano, with 400K tokens against 262K.

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

70 benchmarks have a result for both models as of October 22, 2026. GPT-5 Nano's coding index rests on 0 independent benchmarks and Kimi K2.6's on 3. Where only one model has a result, the page says so instead of naming a winner.

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