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GLM 4.5 Air vs Solar Pro 4

Solar Pro 4 leads GLM 4.5 Air on the Artificial Analysis Intelligence Index, 28.2 to 11.1, and Solar Pro 4 costs 1.8x less per output token ($0.60 vs $1.10 per million). Updated October 22, 2026; 38 benchmarks have a result for both.

Replace GLM 4.5 Air Replace Solar Pro 4
GLM 4.5 AirZ.ai
Coding
No data
Overall
No data
Output $/M
$1.10
12
Solar Pro 4Upstage
Coding
No data
Overall
No data
Output $/M
$0.60
26
vs boards won of 38 shared

GLM 4.5 Air or Solar Pro 4: which to pick

Neither model has a coding score yet, so the two cannot be ranked on coding.

Pick GLM 4.5 Air for work measured by LMArena Text: coding or LMArena Text: software and IT, where it leads.

Model AGLM 4.5 AirZ.aiNot benchmarkedNo coding benchmarkNo cost per solved taskModel BSolar Pro 4UpstageNot benchmarked1 independent benchmarkNo cost per solved task
Shared results
38
GLM 4.5 Air only
10
Solar Pro 4 only
7
Like-for-like categories
7 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
GLM 4.5 Air not benchmarked, Solar Pro 4 not benchmarked.
Widest category
Intelligence, 17.1 points apart on average over 1 shared benchmark.
Widest single gap
Long context reasoning (AA-LCR): GLM 4.5 Air 46.7% against Solar Pro 4 70.7%, 24.0 points apart on a 0 to 100 scale.
Output price
GLM 4.5 Air $1.10 against Solar Pro 4 $0.60 per million output tokens, 1.8x apart.
Context window
GLM 4.5 Air takes 131K 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
CategoryGLM 4.5 AirBarsSolar Pro 4Ties
Coding02
Intelligence01
Reasoning05
Math02
Knowledge22
Web design15
General99
All shared boards1226
CodingLike-for-likeSix of these boards feed the Vibe Coding Index02
Coding benchmarks for GLM 4.5 Air and Solar Pro 4
BenchmarkGLM 4.5 AirSolar Pro 4Leader
LMArena WebDevNot measured1371Only Solar Pro 4 measured
AA Coding IndexNot measured52.7Only Solar Pro 4 measured
LiveCodeBench (Artificial Analysis run)68.4%Not measuredOnly GLM 4.5 Air measured
SciCodeNot measured48.0%Only Solar Pro 4 measured
Terminal-Bench Hard (Artificial Analysis run)20.5%Not measuredOnly GLM 4.5 Air measured
GSO-Bench2.9%Not measuredOnly GLM 4.5 Air measured
ALE-BenchNot measured179.3Only Solar Pro 4 measured
LMArena Text: coding13971438Solar Pro 4
LMArena Text: software and IT14011431Solar Pro 4
LMArena WebDev: ReactNot measured1363Only Solar Pro 4 measured
LMArena WebDev: HTMLNot measured1371Only Solar Pro 4 measured
Neither model has a result on the other 28 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for GLM 4.5 Air and Solar Pro 4
BenchmarkGLM 4.5 AirSolar Pro 4Leader
AA Intelligence Index11.128.2Solar Pro 4
Neither model has a result on the other 1 board here
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
Agentic work benchmarks for GLM 4.5 Air and Solar Pro 4
BenchmarkGLM 4.5 AirSolar Pro 4Leader
Design Arena: agents building web appsNot measured1105Only Solar Pro 4 measured
τ²-Bench Telecom46.5%Not measuredOnly GLM 4.5 Air measured
Neither model has a result on the other 39 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index05
Reasoning benchmarks for GLM 4.5 Air and Solar Pro 4
BenchmarkGLM 4.5 AirSolar Pro 4Leader
GPQA Diamond (Artificial Analysis run)73.3%89.1%Solar Pro 4
Humanity's Last Exam (Artificial Analysis run)7.0%29.8%Solar Pro 4
LMArena Text: hard prompts13791400Solar Pro 4
LMArena Text: expert13701428Solar Pro 4
LMArena Text: hard prompts in English13881427Solar Pro 4
Kagi LLM Benchmark43.0%Not measuredOnly GLM 4.5 Air measured
Neither model has a result on the other 16 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index02
Math benchmarks for GLM 4.5 Air and Solar Pro 4
BenchmarkGLM 4.5 AirSolar Pro 4Leader
AA Math Index80.7Not measuredOnly GLM 4.5 Air measured
AIME 2025 (Artificial Analysis run)80.7%Not measuredOnly GLM 4.5 Air measured
LMArena Text: math13961421Solar Pro 4
LMArena Text: mathematical work13961427Solar Pro 4
Neither model has a result on the other 9 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index22
Knowledge benchmarks for GLM 4.5 Air and Solar Pro 4
BenchmarkGLM 4.5 AirSolar Pro 4Leader
MMLU Pro (Artificial Analysis run)81.5%Not measuredOnly GLM 4.5 Air measured
LMArena Text: science14071404GLM 4.5 Air
LMArena Text: medicine and healthcare14021374GLM 4.5 Air
LMArena Text: legal and government13821383Solar Pro 4
LMArena Text: business and finance13711381Solar Pro 4
Neither model has a result on the other 13 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index15
Web design benchmarks for GLM 4.5 Air and Solar Pro 4
BenchmarkGLM 4.5 AirSolar Pro 4Leader
Design Arena: websites11461176Solar Pro 4
Design Arena: UI components11201147Solar Pro 4
Design Arena: game dev10941169Solar Pro 4
Design Arena: data viz11861177GLM 4.5 Air
Design Arena: 3D11221178Solar Pro 4
Design Arena: all code categories11371182Solar Pro 4
Design Arena: SVG1071Not measuredOnly GLM 4.5 Air measured
Neither model has a result on the other 2 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index99
General benchmarks for GLM 4.5 Air and Solar Pro 4
BenchmarkGLM 4.5 AirSolar Pro 4Leader
IFBench37.6%Not measuredOnly GLM 4.5 Air measured
Long context reasoning (AA-LCR)46.7%70.7%Solar Pro 4
LMArena Text13841388Solar Pro 4
LMArena Text: instruction following13541375Solar Pro 4
LMArena Text: creative writing13431317GLM 4.5 Air
LMArena Text: English13971414Solar Pro 4
LMArena Text: non-English13661363GLM 4.5 Air
LMArena Text: Chinese14261422GLM 4.5 Air
LMArena Text: German13771358GLM 4.5 Air
LMArena Text: Japanese13481320GLM 4.5 Air
LMArena Text: Korean13081383Solar Pro 4
LMArena Text: French14001400Solar Pro 4
LMArena Text: Spanish13851409Solar Pro 4
LMArena Text: Russian13731357GLM 4.5 Air
LMArena Text: Polish13681304GLM 4.5 Air
LMArena Text: multi-turn13711385Solar Pro 4
LMArena Text: longer queries13661382Solar Pro 4
LMArena Text: writing and language13541344GLM 4.5 Air
LMArena Text: entertainment and media13391332GLM 4.5 Air
Neither model has a result on the other 27 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GLM 4.5 Air and Solar Pro 4
BenchmarkGLM 4.5 AirSolar 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

GLM 4.5 Air$0.0008Fits in one request
Solar Pro 4$0.0004Fits in one request

Solar Pro 4 costs less

Repository review

50K input + 3K output tokens

GLM 4.5 Air$0.013Fits in one request
Solar Pro 4$0.0093Fits in one request

Solar Pro 4 costs less

Agent loop

200K input + 10K output tokens

GLM 4.5 Air$0.051Exceeds the context window
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 GLM 4.5 Air and Solar Pro 4
SpecificationZ.ai GLM 4.5 AirUpstage Solar Pro 4
MakerZ.aiUpstage
WeightsOpen weightsNo public weights listed
ReleasedJuly 25, 2025August 10, 2026
Context window131K524K
Input $/Mtok$0.20$0.15
Output $/Mtok$1.10$0.60
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it01
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GLM 4.5 Air better than Solar Pro 4 for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick GLM 4.5 Air for work measured by LMArena Text: coding or LMArena Text: software and IT, where it leads.

Which is cheaper, GLM 4.5 Air or Solar Pro 4?

GLM 4.5 Air costs $0.20 per million input tokens and $1.10 per million output tokens; Solar Pro 4 costs $0.15 and $0.60. Cost per solved task is known for neither of them.

Which has the bigger context window, GLM 4.5 Air or Solar Pro 4?

Solar Pro 4, with 524K tokens against 131K.

How many benchmarks is the GLM 4.5 Air vs Solar Pro 4 comparison based on?

38 benchmarks have a result for both models as of October 22, 2026. GLM 4.5 Air's coding index rests on 0 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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