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GLM 5.1 vs Solar Pro 4

Solar Pro 4 leads GLM 5.1 on the Artificial Analysis Intelligence Index, 28.2 to 26.1, and Solar Pro 4 costs 7.3x less per output token ($0.60 vs $4.40 per million). Updated October 22, 2026; 45 benchmarks have a result for both.

Replace GLM 5.1 Replace Solar Pro 4
GLM 5.1Z.ai
Coding
49.2
Overall
57.5
Output $/M
$4.40
42
Solar Pro 4Upstage
Coding
No data
Overall
No data
Output $/M
$0.60
3
vs boards won of 45 shared

GLM 5.1 or Solar Pro 4: which to pick

Only GLM 5.1 has a coding score, 49.2 on the Vibe Coding Index; Solar Pro 4 has none, so the two cannot be ranked on coding.

Pick Solar Pro 4 for output tokens 7.3x cheaper ($0.60 vs $4.40 per million) and a larger context window (524K against 205K tokens).

Model AGLM 5.1Z.ai49.2/1003 independent benchmarks$0.60 per solved taskModel BSolar Pro 4UpstageNot benchmarked1 independent benchmarkNo cost per solved task
Shared results
45
GLM 5.1 only
44
Solar Pro 4 only
0
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
GLM 5.1 49.2 from 3 benchmarks, Solar Pro 4 not benchmarked.
Widest category
Web design, 16.4 points apart on average over 6 shared benchmarks.
Widest single gap
LMArena Text: Polish: GLM 5.1 1449 against Solar Pro 4 1304, 24.2 points apart on a 0 to 100 scale.
Output price
GLM 5.1 $4.40 against Solar Pro 4 $0.60 per million output tokens, 7.3x apart.
Context window
GLM 5.1 takes 205K 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 5.1BarsSolar Pro 4Ties
Coding71
Intelligence01
Agentic work10
Reasoning41
Math20
Knowledge40
Web design60
General180
All shared boards423
CodingLike-for-likeSix of these boards feed the Vibe Coding Index71
Coding benchmarks for GLM 5.1 and Solar Pro 4
BenchmarkGLM 5.1Solar Pro 4Leader
LMArena WebDev15081371GLM 5.1
AA Coding Index55.852.7GLM 5.1
LiveCodeBench (Vals AI)81.4%Not measuredOnly GLM 5.1 measured
SWE-bench Verified (Vals AI)76.4%Not measuredOnly GLM 5.1 measured
Vibe Code Bench (Vals AI)31.5%Not measuredOnly GLM 5.1 measured
Code migration (Vals AI)25.8%Not measuredOnly GLM 5.1 measured
ProgramBench (Vals AI)0.0%Not measuredOnly GLM 5.1 measured
Terminal-Bench 2.1 (Vals AI)56.9%Not measuredOnly GLM 5.1 measured
SciCode44.8%48.0%Solar Pro 4
Terminal-Bench Hard (Artificial Analysis run)43.2%Not measuredOnly GLM 5.1 measured
WeirdML57.1%Not measuredOnly GLM 5.1 measured
ALE-Bench887.1179.3GLM 5.1
LMArena Text: coding14851438GLM 5.1
LMArena Text: software and IT14841431GLM 5.1
LMArena WebDev: React15051363GLM 5.1
LMArena WebDev: HTML15081371GLM 5.1
Neither model has a result on the other 23 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for GLM 5.1 and Solar Pro 4
BenchmarkGLM 5.1Solar Pro 4Leader
AA Intelligence Index26.128.2Solar Pro 4
Epoch Capabilities Index149.8Not measuredOnly GLM 5.1 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for GLM 5.1 and Solar Pro 4
BenchmarkGLM 5.1Solar Pro 4Leader
AA Agentic Index23.9Not measuredOnly GLM 5.1 measured
Design Arena: agents building web apps11751105GLM 5.1
Design Arena: agents building full-stack apps1167Not measuredOnly GLM 5.1 measured
Design Arena: agents building mobile apps1162Not measuredOnly GLM 5.1 measured
Design Arena: agents building Android apps1182Not measuredOnly GLM 5.1 measured
Design Arena: agents building Godot games1053Not measuredOnly GLM 5.1 measured
Design Arena: agents building games1164Not measuredOnly GLM 5.1 measured
Design Arena: HTML slides1120Not measuredOnly GLM 5.1 measured
Design Arena: PowerPoint slides1163Not measuredOnly GLM 5.1 measured
Design Arena: spreadsheets1315Not measuredOnly GLM 5.1 measured
Finance Agent (Vals AI)44.8%Not measuredOnly GLM 5.1 measured
Legal Research Bench (Vals AI)27.9%Not measuredOnly GLM 5.1 measured
τ²-Bench Telecom97.7%Not measuredOnly GLM 5.1 measured
APEX-Agents40.9%Not measuredOnly GLM 5.1 measured
Vending-Bench 2$5,634Not measuredOnly GLM 5.1 measured
Neither model has a result on the other 26 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index41
Reasoning benchmarks for GLM 5.1 and Solar Pro 4
BenchmarkGLM 5.1Solar Pro 4Leader
GPQA Diamond84.5%Not measuredOnly GLM 5.1 measured
GPQA Diamond (Artificial Analysis run)86.8%89.1%Solar Pro 4
Humanity's Last Exam (Artificial Analysis run)30.1%29.8%GLM 5.1
GPQA Diamond (Epoch AI run)89.9%Not measuredOnly GLM 5.1 measured
SimpleBench55.1%Not measuredOnly GLM 5.1 measured
Chess puzzles20.0%Not measuredOnly GLM 5.1 measured
LMArena Text: hard prompts14731400GLM 5.1
LMArena Text: expert14781428GLM 5.1
LMArena Text: hard prompts in English14821427GLM 5.1
Neither model has a result on the other 13 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index20
Math benchmarks for GLM 5.1 and Solar Pro 4
BenchmarkGLM 5.1Solar Pro 4Leader
AIME91.9%Not measuredOnly GLM 5.1 measured
OTIS Mock AIME93.3%Not measuredOnly GLM 5.1 measured
FrontierMath, tiers 1 to 336.8%Not measuredOnly GLM 5.1 measured
ProofBench22.2%Not measuredOnly GLM 5.1 measured
LMArena Text: math14731421GLM 5.1
LMArena Text: mathematical work14701427GLM 5.1
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40
Knowledge benchmarks for GLM 5.1 and Solar Pro 4
BenchmarkGLM 5.1Solar Pro 4Leader
MMLU Pro86.9%Not measuredOnly GLM 5.1 measured
LegalBench (Vals AI)84.4%Not measuredOnly GLM 5.1 measured
CaseLaw (Vals AI)51.5%Not measuredOnly GLM 5.1 measured
CorpFin (Vals AI)64.5%Not measuredOnly GLM 5.1 measured
TaxEval (Vals AI)71.2%Not measuredOnly GLM 5.1 measured
MedCode (Vals AI)41.6%Not measuredOnly GLM 5.1 measured
SimpleQA Verified34.0%Not measuredOnly GLM 5.1 measured
LMArena Text: science14781404GLM 5.1
LMArena Text: medicine and healthcare14741374GLM 5.1
LMArena Text: legal and government14651383GLM 5.1
LMArena Text: business and finance14521381GLM 5.1
Neither model has a result on the other 7 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index60
Web design benchmarks for GLM 5.1 and Solar Pro 4
BenchmarkGLM 5.1Solar Pro 4Leader
Design Arena: websites12901176GLM 5.1
Design Arena: UI components12921147GLM 5.1
Design Arena: game dev12651169GLM 5.1
Design Arena: data viz13661177GLM 5.1
Design Arena: 3D13361178GLM 5.1
Design Arena: all code categories12681182GLM 5.1
Design Arena: SVG1218Not measuredOnly GLM 5.1 measured
Design Arena: ASCII art1141Not measuredOnly GLM 5.1 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 GLM 5.1 and Solar Pro 4
BenchmarkGLM 5.1Solar Pro 4Leader
Public Benefits Bench (Vals AI)61.8%Not measuredOnly GLM 5.1 measured
MedScribe (Vals AI)72.3%Not measuredOnly GLM 5.1 measured
IFBench76.3%Not measuredOnly GLM 5.1 measured
Long context reasoning (AA-LCR)73.7%70.7%GLM 5.1
ExploitBench18.1%Not measuredOnly GLM 5.1 measured
LMArena Text14631388GLM 5.1
LMArena Text: instruction following14531375GLM 5.1
LMArena Text: creative writing14531317GLM 5.1
LMArena Text: English14761414GLM 5.1
LMArena Text: non-English14481363GLM 5.1
LMArena Text: Chinese15151422GLM 5.1
LMArena Text: German14671358GLM 5.1
LMArena Text: Japanese14351320GLM 5.1
LMArena Text: Korean14241383GLM 5.1
LMArena Text: French14701400GLM 5.1
LMArena Text: Spanish14681409GLM 5.1
LMArena Text: Russian14541357GLM 5.1
LMArena Text: Polish14491304GLM 5.1
LMArena Text: multi-turn14731385GLM 5.1
LMArena Text: longer queries14671382GLM 5.1
LMArena Text: writing and language14541344GLM 5.1
LMArena Text: entertainment and media14421332GLM 5.1
Neither model has a result on the other 24 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GLM 5.1 and Solar Pro 4
BenchmarkGLM 5.1Solar 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 5.1$0.0036Fits in one request
Solar Pro 4$0.0004Fits in one request

Solar Pro 4 costs less

Repository review

50K input + 3K output tokens

GLM 5.1$0.083Fits in one request
Solar Pro 4$0.0093Fits in one request

Solar Pro 4 costs less

Agent loop

200K input + 10K output tokens

GLM 5.1$0.324Exceeds 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 5.1 and Solar Pro 4
SpecificationZ.ai GLM 5.1Upstage Solar Pro 4
MakerZ.aiUpstage
WeightsOpen weightsNo public weights listed
ReleasedApril 7, 2026August 10, 2026
Context window205K524K
Input $/Mtok$1.40$0.15
Output $/Mtok$4.40$0.60
Coding index49.2Not benchmarked
Independent measurements behind it31
Cost per solved task$0.60Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GLM 5.1 better than Solar Pro 4 for coding?

Only GLM 5.1 has a coding score, 49.2 on the Vibe Coding Index; Solar Pro 4 has none, so the two cannot be ranked on coding. Pick Solar Pro 4 for output tokens 7.3x cheaper ($0.60 vs $4.40 per million) and a larger context window (524K against 205K tokens).

Which is cheaper, GLM 5.1 or Solar Pro 4?

GLM 5.1 costs $1.40 per million input tokens and $4.40 per million output tokens; Solar Pro 4 costs $0.15 and $0.60. Cost per solved task is known for GLM 5.1 only.

Which has the bigger context window, GLM 5.1 or Solar Pro 4?

Solar Pro 4, with 524K tokens against 205K.

How many benchmarks is the GLM 5.1 vs Solar Pro 4 comparison based on?

45 benchmarks have a result for both models as of October 22, 2026. GLM 5.1's coding index rests on 3 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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