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GLM 4.5 vs Solar Pro 4

Solar Pro 4 leads GLM 4.5 on the Artificial Analysis Intelligence Index, 28.2 to 12.8, and Solar Pro 4 costs 3.7x less per output token ($0.60 vs $2.20 per million). Updated October 21, 2026; 39 benchmarks have a result for both.

Replace GLM 4.5 Replace Solar Pro 4
GLM 4.5Z.ai
Coding
No data
Overall
No data
Output $/M
$2.20
27
Solar Pro 4Upstage
Coding
No data
Overall
No data
Output $/M
$0.60
12
vs boards won of 39 shared

GLM 4.5 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 for work measured by LMArena Text: coding or AA Intelligence Index, where it leads.

Model AGLM 4.5Z.aiNot benchmarkedNo coding benchmarkNo cost per solved taskModel BSolar Pro 4UpstageNot benchmarked1 independent benchmarkNo cost per solved task
Shared results
39
GLM 4.5 only
22
Solar Pro 4 only
6
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 not benchmarked, Solar Pro 4 not benchmarked.
Widest category
Intelligence, 15.4 points apart on average over 1 shared benchmark.
Widest single gap
LMArena Text: Polish: GLM 4.5 1422 against Solar Pro 4 1304, 19.7 points apart on a 0 to 100 scale.
Output price
GLM 4.5 $2.20 against Solar Pro 4 $0.60 per million output tokens, 3.7x apart.
Context window
GLM 4.5 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 4.5BarsSolar Pro 4Ties
Coding21
Intelligence01
Reasoning32
Math20
Knowledge40
Web design06
General162
All shared boards2712
CodingLike-for-likeSix of these boards feed the Vibe Coding Index21
Coding benchmarks for GLM 4.5 and Solar Pro 4
BenchmarkGLM 4.5Solar Pro 4Leader
SWE-bench Verified64.2%Not measuredOnly GLM 4.5 measured
LMArena WebDevNot measured1371Only Solar Pro 4 measured
AA Coding IndexNot measured52.7Only Solar Pro 4 measured
LiveCodeBench (Vals AI)67.5%Not measuredOnly GLM 4.5 measured
LiveCodeBench (Artificial Analysis run)73.8%Not measuredOnly GLM 4.5 measured
SciCodeNot measured48.0%Only Solar Pro 4 measured
Terminal-Bench Hard (Artificial Analysis run)22.0%Not measuredOnly GLM 4.5 measured
WeirdML40.6%Not measuredOnly GLM 4.5 measured
ALE-Bench344.8179.3GLM 4.5
LMArena Text: coding14341438Solar Pro 4
LMArena Text: software and IT14401431GLM 4.5
LMArena WebDev: ReactNot measured1363Only Solar Pro 4 measured
LMArena WebDev: HTMLNot measured1371Only Solar Pro 4 measured
Neither model has a result on the other 26 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for GLM 4.5 and Solar Pro 4
BenchmarkGLM 4.5Solar Pro 4Leader
AA Intelligence Index12.828.2Solar 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 and Solar Pro 4
BenchmarkGLM 4.5Solar Pro 4Leader
Design Arena: agents building web appsNot measured1105Only Solar Pro 4 measured
τ²-Bench Telecom43.0%Not measuredOnly GLM 4.5 measured
Neither model has a result on the other 39 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index32
Reasoning benchmarks for GLM 4.5 and Solar Pro 4
BenchmarkGLM 4.5Solar Pro 4Leader
GPQA Diamond72.2%Not measuredOnly GLM 4.5 measured
GPQA Diamond (Artificial Analysis run)78.2%89.1%Solar Pro 4
Humanity's Last Exam (Artificial Analysis run)13.0%29.8%Solar Pro 4
LMArena Text: hard prompts14291400GLM 4.5
LMArena Text: expert14331428GLM 4.5
LMArena Text: hard prompts in English14291427GLM 4.5
Kagi LLM Benchmark57.9%Not measuredOnly GLM 4.5 measured
Neither model has a result on the other 15 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index20
Math benchmarks for GLM 4.5 and Solar Pro 4
BenchmarkGLM 4.5Solar Pro 4Leader
AIME86.7%Not measuredOnly GLM 4.5 measured
MATH 500 (Vals AI)94.0%Not measuredOnly GLM 4.5 measured
MGSM (Vals AI)90.8%Not measuredOnly GLM 4.5 measured
AA Math Index73.7Not measuredOnly GLM 4.5 measured
AIME 2025 (Artificial Analysis run)73.7%Not measuredOnly GLM 4.5 measured
LMArena Text: math14271421GLM 4.5
LMArena Text: mathematical work14301427GLM 4.5
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40
Knowledge benchmarks for GLM 4.5 and Solar Pro 4
BenchmarkGLM 4.5Solar Pro 4Leader
MMLU Pro81.2%Not measuredOnly GLM 4.5 measured
LegalBench (Vals AI)75.6%Not measuredOnly GLM 4.5 measured
CorpFin (Vals AI)61.0%Not measuredOnly GLM 4.5 measured
TaxEval (Vals AI)72.4%Not measuredOnly GLM 4.5 measured
MedQA (Vals AI)90.0%Not measuredOnly GLM 4.5 measured
MMLU Pro (Artificial Analysis run)83.5%Not measuredOnly GLM 4.5 measured
LMArena Text: science14441404GLM 4.5
LMArena Text: medicine and healthcare14551374GLM 4.5
LMArena Text: legal and government14381383GLM 4.5
LMArena Text: business and finance14201381GLM 4.5
Neither model has a result on the other 8 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index06
Web design benchmarks for GLM 4.5 and Solar Pro 4
BenchmarkGLM 4.5Solar Pro 4Leader
Design Arena: websites11701176Solar Pro 4
Design Arena: UI components11441150Solar Pro 4
Design Arena: game dev11451170Solar Pro 4
Design Arena: data viz11591177Solar Pro 4
Design Arena: 3D11701178Solar Pro 4
Design Arena: all code categories11651182Solar Pro 4
Design Arena: SVG1096Not measuredOnly GLM 4.5 measured
Neither model has a result on the other 2 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index162
General benchmarks for GLM 4.5 and Solar Pro 4
BenchmarkGLM 4.5Solar Pro 4Leader
IFBench44.1%Not measuredOnly GLM 4.5 measured
Long context reasoning (AA-LCR)52.7%70.7%Solar Pro 4
Creative writing (Lech Mazur)73.4%Not measuredOnly GLM 4.5 measured
LMArena Text14301388GLM 4.5
LMArena Text: instruction following14041375GLM 4.5
LMArena Text: creative writing13951317GLM 4.5
LMArena Text: English14371414GLM 4.5
LMArena Text: non-English14171363GLM 4.5
LMArena Text: Chinese14651422GLM 4.5
LMArena Text: German14071358GLM 4.5
LMArena Text: Japanese14151320GLM 4.5
LMArena Text: Korean13801383Solar Pro 4
LMArena Text: French14181400GLM 4.5
LMArena Text: Spanish14541409GLM 4.5
LMArena Text: Russian14131357GLM 4.5
LMArena Text: Polish14221304GLM 4.5
LMArena Text: multi-turn14151385GLM 4.5
LMArena Text: longer queries14121382GLM 4.5
LMArena Text: writing and language14031344GLM 4.5
LMArena Text: entertainment and media14041332GLM 4.5
Neither model has a result on the other 26 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GLM 4.5 and Solar Pro 4
BenchmarkGLM 4.5Solar 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

GLM 4.5$0.0017Fits 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$0.037Fits 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$0.142Exceeds 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 and Solar Pro 4
SpecificationZ.ai GLM 4.5Upstage Solar Pro 4
MakerZ.aiUpstage
WeightsOpen weightsNo public weights listed
ReleasedJuly 25, 2025August 10, 2026
Context window131K524K
Input $/Mtok$0.60$0.15
Output $/Mtok$2.20$0.60
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it01
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GLM 4.5 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 for work measured by LMArena Text: coding or AA Intelligence Index, where it leads.

Which is cheaper, GLM 4.5 or Solar Pro 4?

GLM 4.5 costs $0.60 per million input tokens and $2.20 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 or Solar Pro 4?

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

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

39 benchmarks have a result for both models as of October 21, 2026. GLM 4.5'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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