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Kimi K2.5 vs Solar Pro 4

Updated October 21, 2026. 44 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Kimi K2.5 Replace Solar Pro 4
Kimi K2.5Moonshot AI
Coding
58.5
Overall
23.5
Output $/M
$2.50
41
Solar Pro 4Upstage
Coding
24.4
Overall
28.2
Output $/M
$0.60
3
vs boards won of 44 shared

Decision reading

Pick Kimi K2.5 for coding: it scores 58.5 on the Vibe Coding Index against 24.4 for Solar Pro 4.

Pick Solar Pro 4 when output tokens cost 4.2x less, or when the context window is larger, 524K against 262K tokens.

Model AKimi K2.5Moonshot AI58.5/1002 independent benchmarks$0.24 per solved taskModel BSolar Pro 4Upstage24.4/1001 independent benchmarkNo cost per solved task
Shared results
44
Kimi K2.5 only
54
Solar Pro 4 only
1
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
Kimi K2.5 58.5 from 2 benchmarks, Solar Pro 4 24.4 from 1 benchmark.
Widest category
General, 11.7 points apart on average over 18 shared benchmarks.
Widest single gap
LMArena Text: Polish: Kimi K2.5 1445 against Solar Pro 4 1304, 23.5 points apart on a 0 to 100 scale.
Output price
Kimi K2.5 $2.50 against Solar Pro 4 $0.60 per million output tokens, 4.2x apart.
Context window
Kimi K2.5 takes 262K tokens, Solar Pro 4 524K.

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
CategoryKimi K2.5BarsSolar Pro 4Ties
Coding61
Intelligence01
Agentic work10
Reasoning41
Math20
Knowledge40
Web design60
General180
All shared boards413
CodingLike-for-likeFour of these boards feed the Vibe Coding Index61
Coding benchmarks for Kimi K2.5 and Solar Pro 4
BenchmarkKimi K2.5Solar Pro 4Leader
SWE-bench Verified70.8%Not measuredOnly Kimi K2.5 measured
SWE-bench Multilingual67.3%Not measuredOnly Kimi K2.5 measured
LMArena WebDev14371371Kimi K2.5
AA Coding Index46.852.7Solar Pro 4
LiveCodeBench (Vals AI)83.9%Not measuredOnly Kimi K2.5 measured
SWE-bench Verified (Vals AI)70.0%Not measuredOnly Kimi K2.5 measured
Vibe Code Bench (Vals AI)17.5%Not measuredOnly Kimi K2.5 measured
Code migration (Vals AI)7.0%Not measuredOnly Kimi K2.5 measured
Terminal-Bench 2.1 (Vals AI)42.0%Not measuredOnly Kimi K2.5 measured
SciCodeNot measured48.0%Only Solar Pro 4 measured
Terminal-Bench Hard (Artificial Analysis run)34.8%Not measuredOnly Kimi K2.5 measured
Terminal-Bench43.2%Not measuredOnly Kimi K2.5 measured
WeirdML45.6%Not measuredOnly Kimi K2.5 measured
ALE-Bench821.6179.3Kimi K2.5
LMArena Text: coding14831438Kimi K2.5
LMArena Text: software and IT14711431Kimi K2.5
LMArena WebDev: React14291363Kimi K2.5
LMArena WebDev: HTML14261371Kimi K2.5
LMArena WebDev: from an image1439Not measuredOnly Kimi K2.5 measured
Neither model has a result on the other 19 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for Kimi K2.5 and Solar Pro 4
BenchmarkKimi K2.5Solar Pro 4Leader
AA Intelligence Index23.528.2Solar Pro 4
Epoch Capabilities Index148.1Not measuredOnly Kimi K2.5 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for Kimi K2.5 and Solar Pro 4
BenchmarkKimi K2.5Solar Pro 4Leader
Design Arena: agents building web apps11361105Kimi K2.5
Design Arena: agents building full-stack apps1114Not measuredOnly Kimi K2.5 measured
Design Arena: agents building mobile apps1147Not measuredOnly Kimi K2.5 measured
Design Arena: agents building Android apps1124Not measuredOnly Kimi K2.5 measured
Design Arena: agents building Godot games1219Not measuredOnly Kimi K2.5 measured
Finance Agent (Vals AI)35.8%Not measuredOnly Kimi K2.5 measured
Legal Research Bench (Vals AI)15.9%Not measuredOnly Kimi K2.5 measured
Excel Modeling Benchmark (Vals AI)28.5%Not measuredOnly Kimi K2.5 measured
τ²-Bench Telecom95.9%Not measuredOnly Kimi K2.5 measured
OSWorld63.3%Not measuredOnly Kimi K2.5 measured
Vending-Bench 2$1,198Not measuredOnly 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 index41
Reasoning benchmarks for Kimi K2.5 and Solar Pro 4
BenchmarkKimi K2.5Solar Pro 4Leader
GPQA Diamond84.1%Not measuredOnly Kimi K2.5 measured
MMMU Pro (Vals AI)84.3%Not measuredOnly Kimi K2.5 measured
GPQA Diamond (Artificial Analysis run)87.9%89.1%Solar Pro 4
Humanity's Last Exam (Artificial Analysis run)30.7%29.8%Kimi K2.5
ARC-AGI65.3%Not measuredOnly Kimi K2.5 measured
ARC-AGI-211.8%Not measuredOnly Kimi K2.5 measured
SimpleBench46.8%Not measuredOnly Kimi K2.5 measured
LMArena Text: hard prompts14531400Kimi K2.5
LMArena Text: expert14661428Kimi K2.5
LMArena Text: hard prompts in English14601427Kimi K2.5
LMArena Vision: diagrams1282Not measuredOnly Kimi K2.5 measured
LMArena Vision: homework1297Not measuredOnly Kimi K2.5 measured
Neither model has a result on the other 9 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index20
Math benchmarks for Kimi K2.5 and Solar Pro 4
BenchmarkKimi K2.5Solar Pro 4Leader
AIME95.6%Not measuredOnly Kimi K2.5 measured
LMArena Text: math14701421Kimi K2.5
LMArena Text: mathematical work14731427Kimi K2.5
Neither model has a result on the other 10 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40
Knowledge benchmarks for Kimi K2.5 and Solar Pro 4
BenchmarkKimi K2.5Solar Pro 4Leader
MMLU Pro85.9%Not measuredOnly Kimi K2.5 measured
CaseLaw (Vals AI)58.7%Not measuredOnly Kimi K2.5 measured
CorpFin (Vals AI)68.3%Not measuredOnly Kimi K2.5 measured
TaxEval (Vals AI)74.2%Not measuredOnly Kimi K2.5 measured
MortgageTax (Vals AI)66.5%Not measuredOnly Kimi K2.5 measured
MedQA (Vals AI)94.4%Not measuredOnly Kimi K2.5 measured
MedCode (Vals AI)39.3%Not measuredOnly Kimi K2.5 measured
SimpleQA Verified34.3%Not measuredOnly Kimi K2.5 measured
LMArena Text: science14591404Kimi K2.5
LMArena Text: medicine and healthcare14481374Kimi K2.5
LMArena Text: legal and government14411383Kimi K2.5
LMArena Text: business and finance14271381Kimi K2.5
Neither model has a result on the other 5 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index60
Web design benchmarks for Kimi K2.5 and Solar Pro 4
BenchmarkKimi K2.5Solar Pro 4Leader
Design Arena: websites12491176Kimi K2.5
Design Arena: UI components12361150Kimi K2.5
Design Arena: game dev12071170Kimi K2.5
Design Arena: data viz12191177Kimi K2.5
Design Arena: 3D12051178Kimi K2.5
Design Arena: all code categories12361182Kimi K2.5
Design Arena: SVG1149Not measuredOnly Kimi K2.5 measured
Design Arena: ASCII art1165Not measuredOnly 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 index180
General benchmarks for Kimi K2.5 and Solar Pro 4
BenchmarkKimi K2.5Solar Pro 4Leader
SAGE (Vals AI)49.9%Not measuredOnly Kimi K2.5 measured
MedScribe (Vals AI)76.4%Not measuredOnly Kimi K2.5 measured
IFBench70.2%Not measuredOnly Kimi K2.5 measured
Long context reasoning (AA-LCR)78.0%70.7%Kimi K2.5
Fiction.LiveBench86.1%Not measuredOnly Kimi K2.5 measured
CL-bench19.3%Not measuredOnly Kimi K2.5 measured
CL-bench Life13.2%Not measuredOnly Kimi K2.5 measured
LMArena Text14451388Kimi K2.5
LMArena Text: instruction following14311375Kimi K2.5
LMArena Text: creative writing14221317Kimi K2.5
LMArena Vision1269Not measuredOnly Kimi K2.5 measured
LMArena Text: English14531414Kimi K2.5
LMArena Text: non-English14331363Kimi K2.5
LMArena Text: Chinese14941422Kimi K2.5
LMArena Text: German14411358Kimi K2.5
LMArena Text: Japanese14231320Kimi K2.5
LMArena Text: Korean14121383Kimi K2.5
LMArena Text: French14541400Kimi K2.5
LMArena Text: Spanish14501409Kimi K2.5
LMArena Text: Russian14351357Kimi K2.5
LMArena Text: Polish14451304Kimi K2.5
LMArena Text: multi-turn14441385Kimi K2.5
LMArena Text: longer queries14451382Kimi K2.5
LMArena Text: writing and language14251344Kimi K2.5
LMArena Text: entertainment and media14171332Kimi K2.5
LMArena Vision: English1274Not measuredOnly Kimi K2.5 measured
LMArena Vision: Chinese1328Not measuredOnly Kimi K2.5 measured
LMArena Vision: reading text1276Not measuredOnly Kimi K2.5 measured
LMArena Vision: humor1284Not measuredOnly Kimi K2.5 measured
LMArena Vision: captioning1257Not measuredOnly Kimi K2.5 measured
LMArena Vision: recognizing things1285Not measuredOnly Kimi K2.5 measured
LMArena Vision: creative writing1269Not measuredOnly Kimi K2.5 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 Kimi K2.5 and Solar Pro 4
BenchmarkKimi K2.5Solar Pro 4Leader
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

Kimi K2.5$0.0018Fits in one request
Solar Pro 4$0.0004Fits in one request

Solar Pro 4 costs less

Repository review

50K input + 3K output tokens

Kimi K2.5$0.033Fits in one request
Solar Pro 4$0.0093Fits in one request

Solar Pro 4 costs less

Agent loop

200K input + 10K output tokens

Kimi K2.5$0.125Fits in one request
Solar Pro 4$0.036Fits in one request

Solar Pro 4 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 Kimi K2.5 and Solar Pro 4
SpecificationMoonshotAI Kimi K2.5Upstage Solar Pro 4
MakerMoonshot AIUpstage
WeightsOpen weightsNo public weights listed
ReleasedJanuary 27, 2026August 10, 2026
Context window262K524K
Input $/Mtok$0.50$0.15
Output $/Mtok$2.50$0.60
Coding index58.524.4
Independent measurements behind it21
Cost per solved task$0.24Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Kimi K2.5 better than Solar Pro 4 for coding?

Pick Kimi K2.5 for coding: it scores 58.5 on the Vibe Coding Index against 24.4 for Solar Pro 4. Pick Solar Pro 4 when output tokens cost 4.2x less, or when the context window is larger, 524K against 262K tokens.

Which is cheaper, Kimi K2.5 or Solar Pro 4?

Kimi K2.5 costs $0.50 per million input tokens and $2.50 per million output tokens; Solar Pro 4 costs $0.15 and $0.60. Cost per solved task is known for Kimi K2.5 only.

Which has the bigger context window, Kimi K2.5 or Solar Pro 4?

Solar Pro 4, with 524K tokens against 262K.

How many benchmarks is the Kimi K2.5 vs Solar Pro 4 comparison based on?

44 benchmarks have a result for both models as of October 21, 2026. Kimi K2.5's coding index rests on 2 independent benchmarks and Solar Pro 4's on 1. Where only one model has a result, the page says so instead of naming a winner.

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