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Claude Sonnet 5 vs GLM 5.1

Claude Sonnet 5 leads GLM 5.1 on coding, 57.7 to 49.2 on the Vibe Coding Index, and GLM 5.1 costs 2.3x less per output token ($4.40 vs $10.00 per million). Updated October 22, 2026; 83 benchmarks have a result for both.

Replace Claude Sonnet 5 Replace GLM 5.1
Claude Sonnet 5Anthropic
Coding
57.7
Overall
63.2
Output $/M
$10.00
48
GLM 5.1Z.ai
Coding
49.2
Overall
57.5
Output $/M
$4.40
34
vs boards won of 83 shared, 1 tied

Claude Sonnet 5 or GLM 5.1: which to pick

Pick Claude Sonnet 5 for coding: it scores 57.7 on the Vibe Coding Index against 49.2 for GLM 5.1.

Pick GLM 5.1 for output tokens 2.3x cheaper ($4.40 vs $10.00 per million) and a lower cost per solved task ($0.60 against $1.87).

Model AClaude Sonnet 5Anthropic57.7/1006 independent benchmarks$1.87 per solved taskModel BGLM 5.1Z.ai49.2/1003 independent benchmarks$0.60 per solved task
Shared results
83
Claude Sonnet 5 only
38
GLM 5.1 only
6
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
Claude Sonnet 5 57.7 from 6 benchmarks, GLM 5.1 49.2 from 3 benchmarks.
Widest category
Math, 17.6 points apart on average over 5 shared benchmarks.
Widest single gap
ProofBench: Claude Sonnet 5 77.0% against GLM 5.1 22.2%, 54.8 points apart on a 0 to 100 scale.
Output price
Claude Sonnet 5 $10.00 against GLM 5.1 $4.40 per million output tokens, 2.3x apart.
Context window
Claude Sonnet 5 takes 1M tokens, GLM 5.1 205K.

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
CategoryClaude Sonnet 5BarsGLM 5.1Ties
Coding1221 tie
Intelligence20
Agentic work131
Reasoning72
Math41
Knowledge46
Web design35
General317
All shared boards48341 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index122
Coding benchmarks for Claude Sonnet 5 and GLM 5.1
BenchmarkClaude Sonnet 5GLM 5.1Leader
LiveBench coding74.7%Not measuredOnly Claude Sonnet 5 measured
LMArena WebDev15401508Claude Sonnet 5
AA Coding Index71.555.8Claude Sonnet 5
LiveCodeBench (Vals AI)82.4%81.4%Claude Sonnet 5
SWE-bench Verified (Vals AI)79.6%76.4%Claude Sonnet 5
Terminal-Bench 4 (Vals AI)10.6%Not measuredOnly Claude Sonnet 5 measured
Vibe Code Bench (Vals AI)81.3%31.5%Claude Sonnet 5
Code migration (Vals AI)44.4%25.8%Claude Sonnet 5
ProgramBench (Vals AI)0.0%0.0%Tie
IOI (Vals AI)45.0%Not measuredOnly Claude Sonnet 5 measured
Terminal-Bench 2.1 (Vals AI)74.5%56.9%Claude Sonnet 5
Vibe Code Bench 1-100 (Vals AI)13.8%Not measuredOnly Claude Sonnet 5 measured
SkillsBench (Vals AI)46.5%Not measuredOnly Claude Sonnet 5 measured
CyberBench (Vals AI)70.3%Not measuredOnly Claude Sonnet 5 measured
SciCode54.3%44.8%Claude Sonnet 5
Terminal-Bench Hard (Artificial Analysis run)Not measured43.2%Only GLM 5.1 measured
FrontierCode42.7%Not measuredOnly Claude Sonnet 5 measured
GSO-Bench37.3%Not measuredOnly Claude Sonnet 5 measured
WeirdML68.8%57.1%Claude Sonnet 5
ALE-Bench1463.1887.1Claude Sonnet 5
LMArena Text: coding14831485GLM 5.1
LMArena Text: software and IT14741484GLM 5.1
LMArena WebDev: React15411505Claude Sonnet 5
LMArena WebDev: HTML15271508Claude Sonnet 5
LMArena WebDev: from an image1540Not measuredOnly Claude Sonnet 5 measured
SciCode10.7%Not measuredOnly Claude Sonnet 5 measured
Neither model has a result on the other 13 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Sonnet 5 and GLM 5.1
BenchmarkClaude Sonnet 5GLM 5.1Leader
AA Intelligence Index38.226.1Claude Sonnet 5
Epoch Capabilities Index156.9149.8Claude Sonnet 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index131
Agentic work benchmarks for Claude Sonnet 5 and GLM 5.1
BenchmarkClaude Sonnet 5GLM 5.1Leader
AA Agentic Index43.623.9Claude Sonnet 5
Design Arena: agents building web apps12451175Claude Sonnet 5
Design Arena: agents building full-stack apps12491167Claude Sonnet 5
Design Arena: agents building mobile apps12151162Claude Sonnet 5
Design Arena: agents building Android apps12271182Claude Sonnet 5
Design Arena: agents building Godot games12251053Claude Sonnet 5
Design Arena: agents building games12271164Claude Sonnet 5
Design Arena: HTML slides11681120Claude Sonnet 5
Design Arena: PowerPoint slides11911163Claude Sonnet 5
Design Arena: spreadsheets10351315GLM 5.1
LiveBench research82.8%Not measuredOnly Claude Sonnet 5 measured
LiveBench browser72.0%Not measuredOnly Claude Sonnet 5 measured
LiveBench long agentic39.0%Not measuredOnly Claude Sonnet 5 measured
SREBench (Vals AI)0.4%Not measuredOnly Claude Sonnet 5 measured
Finance Agent (Vals AI)53.9%44.8%Claude Sonnet 5
Tax Agent Bench (Vals AI)29.4%Not measuredOnly Claude Sonnet 5 measured
Legal Research Bench (Vals AI)41.8%27.9%Claude Sonnet 5
Excel Modeling Benchmark (Vals AI)66.3%Not measuredOnly Claude Sonnet 5 measured
Terminal-Bench-Science (Vals AI)5.7%Not measuredOnly Claude Sonnet 5 measured
τ²-Bench TelecomNot measured97.7%Only GLM 5.1 measured
APEX-Agents54.5%40.9%Claude Sonnet 5
Vending-Bench 2$6,378$5,634Claude Sonnet 5
Neither model has a result on the other 19 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index72
Reasoning benchmarks for Claude Sonnet 5 and GLM 5.1
BenchmarkClaude Sonnet 5GLM 5.1Leader
GPQA Diamond88.9%84.5%Claude Sonnet 5
LiveBench reasoning88.7%Not measuredOnly Claude Sonnet 5 measured
MMMU Pro (Vals AI)83.0%Not measuredOnly Claude Sonnet 5 measured
GPQA Diamond (Artificial Analysis run)91.1%86.8%Claude Sonnet 5
Humanity's Last Exam (Artificial Analysis run)41.3%30.1%Claude Sonnet 5
GPQA Diamond (Epoch AI run)90.5%89.9%Claude Sonnet 5
SimpleBench60.6%55.1%Claude Sonnet 5
Chess puzzles45.0%20.0%Claude Sonnet 5
Mystery game puzzles35.0%Not measuredOnly Claude Sonnet 5 measured
LMArena Text: hard prompts14611473GLM 5.1
LMArena Text: expert14891478Claude Sonnet 5
LMArena Text: hard prompts in English14641482GLM 5.1
LMArena Vision: diagrams1293Not measuredOnly Claude Sonnet 5 measured
LMArena Vision: homework1311Not measuredOnly Claude Sonnet 5 measured
Neither model has a result on the other 8 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index41
Math benchmarks for Claude Sonnet 5 and GLM 5.1
BenchmarkClaude Sonnet 5GLM 5.1Leader
AIMENot measured91.9%Only GLM 5.1 measured
OTIS Mock AIME94.7%93.3%Claude Sonnet 5
FrontierMath, tiers 1 to 365.6%36.8%Claude Sonnet 5
FrontierMath, tier 429.3%Not measuredOnly Claude Sonnet 5 measured
ProofBench77.0%22.2%Claude Sonnet 5
LMArena Text: math14671473GLM 5.1
LMArena Text: mathematical work14811470Claude Sonnet 5
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index46
Knowledge benchmarks for Claude Sonnet 5 and GLM 5.1
BenchmarkClaude Sonnet 5GLM 5.1Leader
MMLU Pro87.5%86.9%Claude Sonnet 5
LegalBench (Vals AI)83.9%84.4%GLM 5.1
CaseLaw (Vals AI)Not measured51.5%Only GLM 5.1 measured
CorpFin (Vals AI)67.0%64.5%Claude Sonnet 5
TaxEval (Vals AI)75.6%71.2%Claude Sonnet 5
MortgageTax (Vals AI)70.0%Not measuredOnly Claude Sonnet 5 measured
MedCode (Vals AI)47.5%41.6%Claude Sonnet 5
SimpleQA Verified33.7%34.0%GLM 5.1
LMArena Text: science14601478GLM 5.1
LMArena Text: medicine and healthcare14421474GLM 5.1
LMArena Text: legal and government14541465GLM 5.1
LMArena Text: business and finance14361452GLM 5.1
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index35
Web design benchmarks for Claude Sonnet 5 and GLM 5.1
BenchmarkClaude Sonnet 5GLM 5.1Leader
Design Arena: websites12741290GLM 5.1
Design Arena: UI components12771292GLM 5.1
Design Arena: game dev12771265Claude Sonnet 5
Design Arena: data viz12511366GLM 5.1
Design Arena: 3D12611336GLM 5.1
Design Arena: all code categories12751268Claude Sonnet 5
Design Arena: SVG11921218GLM 5.1
Design Arena: ASCII art12071141Claude Sonnet 5
LiveBench design82.0%Not measuredOnly Claude Sonnet 5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index317
General benchmarks for Claude Sonnet 5 and GLM 5.1
BenchmarkClaude Sonnet 5GLM 5.1Leader
LiveBench data analysis71.7%Not measuredOnly Claude Sonnet 5 measured
Public Benefits Bench (Vals AI)66.0%61.8%Claude Sonnet 5
SAGE (Vals AI)48.9%Not measuredOnly Claude Sonnet 5 measured
MedScribe (Vals AI)76.0%72.3%Claude Sonnet 5
Vals Multimodal Index68.8%Not measuredOnly Claude Sonnet 5 measured
IFBenchNot measured76.3%Only GLM 5.1 measured
Long context reasoning (AA-LCR)82.0%73.7%Claude Sonnet 5
DTBench92.5%Not measuredOnly Claude Sonnet 5 measured
LMCA50.0%Not measuredOnly Claude Sonnet 5 measured
Surface Evolver Bench60.0%Not measuredOnly Claude Sonnet 5 measured
ExploitBenchNot measured18.1%Only GLM 5.1 measured
LMArena Text14421463GLM 5.1
LMArena Text: instruction following14521453GLM 5.1
LMArena Text: creative writing14161453GLM 5.1
LMArena Vision1273Not measuredOnly Claude Sonnet 5 measured
LMArena Text: English14501476GLM 5.1
LMArena Text: non-English14311448GLM 5.1
LMArena Text: Chinese14781515GLM 5.1
LMArena Text: German14421467GLM 5.1
LMArena Text: Japanese14221435GLM 5.1
LMArena Text: Korean14121424GLM 5.1
LMArena Text: French14631470GLM 5.1
LMArena Text: Spanish14381468GLM 5.1
LMArena Text: Russian14501454GLM 5.1
LMArena Text: Polish14251449GLM 5.1
LMArena Text: multi-turn14531473GLM 5.1
LMArena Text: longer queries14621467GLM 5.1
LMArena Text: writing and language14361454GLM 5.1
LMArena Text: entertainment and media14111442GLM 5.1
LMArena Vision: English1275Not measuredOnly Claude Sonnet 5 measured
LMArena Vision: Chinese1331Not measuredOnly Claude Sonnet 5 measured
LMArena Vision: reading text1288Not measuredOnly Claude Sonnet 5 measured
LMArena Vision: humor1261Not measuredOnly Claude Sonnet 5 measured
LMArena Vision: creative writing1246Not measuredOnly Claude Sonnet 5 measured
LMArena Document1466Not measuredOnly Claude Sonnet 5 measured
Neither model has a result on the other 11 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Sonnet 5 and GLM 5.1
BenchmarkClaude Sonnet 5GLM 5.1Leader
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

Claude Sonnet 5$0.0070Fits in one request
GLM 5.1$0.0036Fits in one request

GLM 5.1 costs less

Repository review

50K input + 3K output tokens

Claude Sonnet 5$0.130Fits in one request
GLM 5.1$0.083Fits in one request

GLM 5.1 costs less

Agent loop

200K input + 10K output tokens

Claude Sonnet 5$0.500Fits in one request
GLM 5.1$0.324Exceeds the context window

GLM 5.1 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 Claude Sonnet 5 and GLM 5.1
SpecificationAnthropic Claude Sonnet 5Z.ai GLM 5.1
MakerAnthropicZ.ai
WeightsNo public weights listedOpen weights
ReleasedJune 30, 2026April 7, 2026
Context window1M205K
Input $/Mtok$2.00$1.40
Output $/Mtok$10.00$4.40
Coding index57.749.2
Independent measurements behind it63
Cost per solved task$1.87$0.60
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Sonnet 5 better than GLM 5.1 for coding?

Pick Claude Sonnet 5 for coding: it scores 57.7 on the Vibe Coding Index against 49.2 for GLM 5.1. Pick GLM 5.1 for output tokens 2.3x cheaper ($4.40 vs $10.00 per million) and a lower cost per solved task ($0.60 against $1.87).

Which is cheaper, Claude Sonnet 5 or GLM 5.1?

Claude Sonnet 5 costs $2.00 per million input tokens and $10.00 per million output tokens; GLM 5.1 costs $1.40 and $4.40. Per solved SWE-bench Verified task, Claude Sonnet 5 costs $1.87 and GLM 5.1 $0.60.

Which has the bigger context window, Claude Sonnet 5 or GLM 5.1?

Claude Sonnet 5, with 1M tokens against 205K.

How many benchmarks is the Claude Sonnet 5 vs GLM 5.1 comparison based on?

83 benchmarks have a result for both models as of October 22, 2026. Claude Sonnet 5's coding index rests on 6 independent benchmarks and GLM 5.1's on 3. Where only one model has a result, the page says so instead of naming a winner.

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