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GPT-4.1 Mini vs Kimi K2.5

Updated October 21, 2026. 68 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace GPT-4.1 Mini Replace Kimi K2.5
GPT-4.1 MiniOpenAI
Coding
28.5
Overall
10.2
Output $/M
$1.60
0
Kimi K2.5Moonshot AI
Coding
58.5
Overall
23.5
Output $/M
$2.50
68
vs boards won of 68 shared

Decision reading

Pick Kimi K2.5 for coding: it scores 58.5 on the Vibe Coding Index against 28.5 for GPT-4.1 Mini.

Pick GPT-4.1 Mini when output tokens cost 1.6x less, or when the context window is larger, 1.05M against 262K tokens.

Model AGPT-4.1 MiniOpenAI28.5/1002 independent benchmarks$1.818 per solved taskModel BKimi K2.5Moonshot AI58.5/1002 independent benchmarks$0.24 per solved task
Shared results
68
GPT-4.1 Mini only
16
Kimi K2.5 only
30
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-4.1 Mini 28.5 from 2 benchmarks, Kimi K2.5 58.5 from 2 benchmarks.
Widest category
Agentic work, 43.0 points apart on average over 1 shared benchmark.
Widest single gap
ARC-AGI: GPT-4.1 Mini 3.5% against Kimi K2.5 65.3%, 61.8 points apart on a 0 to 100 scale.
Output price
GPT-4.1 Mini $1.60 against Kimi K2.5 $2.50 per million output tokens, 1.6x apart.
Context window
GPT-4.1 Mini 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-4.1 MiniBarsKimi K2.5Ties
Coding07
Intelligence02
Agentic work01
Reasoning011
Math03
Knowledge010
Web design06
General028
All shared boards068
CodingLike-for-likeFour of these boards feed the Vibe Coding Index07
Coding benchmarks for GPT-4.1 Mini and Kimi K2.5
BenchmarkGPT-4.1 MiniKimi K2.5Leader
Aider polyglot32.4%Not measuredOnly GPT-4.1 Mini measured
SWE-bench Verified23.9%70.8%Kimi K2.5
SWE-bench MultilingualNot measured67.3%Only Kimi K2.5 measured
LMArena WebDevNot measured1437Only Kimi K2.5 measured
AA Coding Index20.246.8Kimi K2.5
LiveCodeBench (Vals AI)58.2%83.9%Kimi K2.5
SWE-bench Verified (Vals AI)Not measured70.0%Only Kimi K2.5 measured
Vibe Code Bench (Vals AI)Not measured17.5%Only Kimi K2.5 measured
Code migration (Vals AI)Not measured7.0%Only Kimi K2.5 measured
Terminal-Bench 2.1 (Vals AI)Not measured42.0%Only Kimi K2.5 measured
LiveCodeBench (Artificial Analysis run)48.3%Not measuredOnly GPT-4.1 Mini measured
Terminal-Bench Hard (Artificial Analysis run)7.6%34.8%Kimi K2.5
Terminal-BenchNot measured43.2%Only Kimi K2.5 measured
WeirdML37.6%45.6%Kimi K2.5
ALE-BenchNot measured821.6Only Kimi K2.5 measured
LMArena Text: coding13671483Kimi K2.5
LMArena Text: software and IT13601471Kimi K2.5
LMArena WebDev: ReactNot measured1429Only Kimi K2.5 measured
LMArena WebDev: HTMLNot measured1426Only Kimi K2.5 measured
LMArena WebDev: from an imageNot measured1439Only Kimi K2.5 measured
Neither model has a result on the other 18 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for GPT-4.1 Mini and Kimi K2.5
BenchmarkGPT-4.1 MiniKimi K2.5Leader
AA Intelligence Index10.223.5Kimi K2.5
Epoch Capabilities Index134.9148.1Kimi K2.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
Agentic work benchmarks for GPT-4.1 Mini and Kimi K2.5
BenchmarkGPT-4.1 MiniKimi K2.5Leader
Design Arena: agents building web appsNot measured1136Only Kimi K2.5 measured
Design Arena: agents building full-stack appsNot measured1114Only Kimi K2.5 measured
Design Arena: agents building mobile appsNot measured1147Only Kimi K2.5 measured
Design Arena: agents building Android appsNot measured1124Only Kimi K2.5 measured
Design Arena: agents building Godot gamesNot measured1219Only Kimi K2.5 measured
Finance Agent (Vals AI)Not measured35.8%Only Kimi K2.5 measured
Legal Research Bench (Vals AI)Not measured15.9%Only Kimi K2.5 measured
Excel Modeling Benchmark (Vals AI)Not measured28.5%Only Kimi K2.5 measured
τ²-Bench Telecom52.9%95.9%Kimi K2.5
OSWorldNot measured63.3%Only Kimi K2.5 measured
Vending-Bench 2Not measured$1,198Only Kimi K2.5 measured
Neither model has a result on the other 28 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index011
Reasoning benchmarks for GPT-4.1 Mini and Kimi K2.5
BenchmarkGPT-4.1 MiniKimi K2.5Leader
GPQA Diamond67.9%84.1%Kimi K2.5
MMMU Pro (Vals AI)70.5%84.3%Kimi K2.5
GPQA Diamond (Artificial Analysis run)66.4%87.9%Kimi K2.5
Humanity's Last Exam (Artificial Analysis run)5.0%30.7%Kimi K2.5
GPQA Diamond (Epoch AI run)65.8%Not measuredOnly GPT-4.1 Mini measured
ARC-AGI3.5%65.3%Kimi K2.5
ARC-AGI-20.0%11.8%Kimi K2.5
SimpleBenchNot measured46.8%Only Kimi K2.5 measured
Chess puzzles1.0%Not measuredOnly GPT-4.1 Mini measured
Mystery game puzzles7.0%Not measuredOnly GPT-4.1 Mini measured
LMArena Text: hard prompts13491453Kimi K2.5
LMArena Text: expert13381466Kimi K2.5
LMArena Text: hard prompts in English13621460Kimi K2.5
LMArena Vision: diagrams11821282Kimi K2.5
LMArena Vision: homework12141297Kimi K2.5
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index03
Math benchmarks for GPT-4.1 Mini and Kimi K2.5
BenchmarkGPT-4.1 MiniKimi K2.5Leader
AIME49.4%95.6%Kimi K2.5
MATH 500 (Vals AI)88.0%Not measuredOnly GPT-4.1 Mini measured
MGSM (Vals AI)87.8%Not measuredOnly GPT-4.1 Mini measured
AA Math Index46.3Not measuredOnly GPT-4.1 Mini measured
AIME 2025 (Artificial Analysis run)46.3%Not measuredOnly GPT-4.1 Mini measured
OTIS Mock AIME44.7%Not measuredOnly GPT-4.1 Mini measured
FrontierMath, tiers 1 to 36.7%Not measuredOnly GPT-4.1 Mini measured
MATH level 587.3%Not measuredOnly GPT-4.1 Mini measured
LMArena Text: math13431470Kimi K2.5
LMArena Text: mathematical work13471473Kimi K2.5
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index010
Knowledge benchmarks for GPT-4.1 Mini and Kimi K2.5
BenchmarkGPT-4.1 MiniKimi K2.5Leader
MMLU Pro77.2%85.9%Kimi K2.5
LegalBench (Vals AI)78.0%Not measuredOnly GPT-4.1 Mini measured
CaseLaw (Vals AI)Not measured58.7%Only Kimi K2.5 measured
CorpFin (Vals AI)57.9%68.3%Kimi K2.5
TaxEval (Vals AI)71.9%74.2%Kimi K2.5
MortgageTax (Vals AI)65.5%66.5%Kimi K2.5
MedQA (Vals AI)84.6%94.4%Kimi K2.5
MedCode (Vals AI)Not measured39.3%Only Kimi K2.5 measured
MMLU Pro (Artificial Analysis run)78.1%Not measuredOnly GPT-4.1 Mini measured
SimpleQA Verified12.7%34.3%Kimi K2.5
LMArena Text: science13281459Kimi K2.5
LMArena Text: medicine and healthcare13241448Kimi K2.5
LMArena Text: legal and government13431441Kimi K2.5
LMArena Text: business and finance13221427Kimi K2.5
Neither model has a result on the other 3 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index06
Web design benchmarks for GPT-4.1 Mini and Kimi K2.5
BenchmarkGPT-4.1 MiniKimi K2.5Leader
Design Arena: websites9971249Kimi K2.5
Design Arena: UI components9611236Kimi K2.5
Design Arena: game dev10711207Kimi K2.5
Design Arena: data viz10341219Kimi K2.5
Design Arena: 3D8371205Kimi K2.5
Design Arena: all code categories9941236Kimi K2.5
Design Arena: SVGNot measured1149Only Kimi K2.5 measured
Design Arena: ASCII artNot measured1165Only Kimi K2.5 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index028
General benchmarks for GPT-4.1 Mini and Kimi K2.5
BenchmarkGPT-4.1 MiniKimi K2.5Leader
SAGE (Vals AI)Not measured49.9%Only Kimi K2.5 measured
MedScribe (Vals AI)Not measured76.4%Only Kimi K2.5 measured
IFBench38.3%70.2%Kimi K2.5
Long context reasoning (AA-LCR)44.0%78.0%Kimi K2.5
DTBench68.8%Not measuredOnly GPT-4.1 Mini measured
LMCA21.1%Not measuredOnly GPT-4.1 Mini measured
Fiction.LiveBench44.4%86.1%Kimi K2.5
CL-benchNot measured19.3%Only Kimi K2.5 measured
CL-bench LifeNot measured13.2%Only Kimi K2.5 measured
LMArena Text13411445Kimi K2.5
LMArena Text: instruction following13331431Kimi K2.5
LMArena Text: creative writing12991422Kimi K2.5
LMArena Vision11811269Kimi K2.5
LMArena Text: English13561453Kimi K2.5
LMArena Text: non-English13181433Kimi K2.5
LMArena Text: Chinese13291494Kimi K2.5
LMArena Text: German13501441Kimi K2.5
LMArena Text: Japanese12901423Kimi K2.5
LMArena Text: Korean12981412Kimi K2.5
LMArena Text: French13581454Kimi K2.5
LMArena Text: Spanish13191450Kimi K2.5
LMArena Text: Russian13241435Kimi K2.5
LMArena Text: Polish13261445Kimi K2.5
LMArena Text: multi-turn13541444Kimi K2.5
LMArena Text: longer queries13441445Kimi K2.5
LMArena Text: writing and language13191425Kimi K2.5
LMArena Text: entertainment and media13001417Kimi K2.5
LMArena Vision: English11911274Kimi K2.5
LMArena Vision: Chinese11861328Kimi K2.5
LMArena Vision: reading text11881276Kimi K2.5
LMArena Vision: humor11821284Kimi K2.5
LMArena Vision: captioning11741257Kimi K2.5
LMArena Vision: recognizing things11871285Kimi K2.5
LMArena Vision: creative writing11821269Kimi K2.5
Neither model has a result on the other 12 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-4.1 Mini and Kimi K2.5
BenchmarkGPT-4.1 MiniKimi 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-4.1 Mini$0.0012Fits in one request
Kimi K2.5$0.0018Fits in one request

GPT-4.1 Mini costs less

Repository review

50K input + 3K output tokens

GPT-4.1 Mini$0.025Fits in one request
Kimi K2.5$0.033Fits in one request

GPT-4.1 Mini costs less

Agent loop

200K input + 10K output tokens

GPT-4.1 Mini$0.096Fits in one request
Kimi K2.5$0.125Fits in one request

GPT-4.1 Mini 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-4.1 Mini and Kimi K2.5
SpecificationOpenAI GPT-4.1 MiniMoonshotAI Kimi K2.5
MakerOpenAIMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedApril 14, 2025January 27, 2026
Context window1.05M262K
Input $/Mtok$0.40$0.50
Output $/Mtok$1.60$2.50
Coding index28.558.5
Independent measurements behind it22
Cost per solved task$1.818$0.24
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-4.1 Mini better than Kimi K2.5 for coding?

Pick Kimi K2.5 for coding: it scores 58.5 on the Vibe Coding Index against 28.5 for GPT-4.1 Mini. Pick GPT-4.1 Mini when output tokens cost 1.6x less, or when the context window is larger, 1.05M against 262K tokens.

Which is cheaper, GPT-4.1 Mini or Kimi K2.5?

GPT-4.1 Mini costs $0.40 per million input tokens and $1.60 per million output tokens; Kimi K2.5 costs $0.50 and $2.50. Per solved SWE-bench Verified task, GPT-4.1 Mini costs $1.818 and Kimi K2.5 $0.24.

Which has the bigger context window, GPT-4.1 Mini or Kimi K2.5?

GPT-4.1 Mini, with 1.05M tokens against 262K.

How many benchmarks is the GPT-4.1 Mini vs Kimi K2.5 comparison based on?

68 benchmarks have a result for both models as of October 21, 2026. GPT-4.1 Mini's coding index rests on 2 independent benchmarks and Kimi K2.5's on 2. Where only one model has a result, the page says so instead of naming a winner.

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<iframe src="https://llmbenchmark.ai/embed/compare/gpt-4-1-mini-vs-kimi-k2-5" title="GPT-4.1 Mini vs Kimi K2.5, LLMBenchmark.ai" width="100%" height="360" style="border:0;max-width:100%" loading="lazy"></iframe>
<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/gpt-4-1-mini-vs-kimi-k2-5">LLMBenchmark.ai, GPT-4.1 Mini vs Kimi K2.5</a></p>