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Claude Opus 5 vs GLM 5.3

Updated October 21, 2026. 97 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Opus 5 Replace GLM 5.3
Claude Opus 5Anthropic
Coding
81.8
Overall
50.8
Output $/M
$25.00
95
GLM 5.3Z.ai
Coding
73.1
Overall
44.8
Output $/M
$1.40
2
vs boards won of 97 shared

Decision reading

Pick Claude Opus 5 for coding: it scores 81.8 on the Vibe Coding Index against 73.1 for GLM 5.3.

Pick GLM 5.3 when output tokens cost 17.9x less, or when a solved task costs $0.36 against $1.33.

Model AClaude Opus 5Anthropic81.8/1002 independent benchmarks$1.33 per solved taskModel BGLM 5.3Z.ai73.1/1002 independent benchmarks$0.36 per solved task
Shared results
97
Claude Opus 5 only
33
GLM 5.3 only
3
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
Claude Opus 5 81.8 from 2 benchmarks, GLM 5.3 73.1 from 2 benchmarks.
Widest category
Math, 22.1 points apart on average over 6 shared benchmarks.
Widest single gap
LiveBench browser: Claude Opus 5 84.0% against GLM 5.3 0.0%, 84.0 points apart on a 0 to 100 scale.
Output price
Claude Opus 5 $25.00 against GLM 5.3 $1.40 per million output tokens, 17.9x apart.
Context window
Claude Opus 5 takes 1M tokens, GLM 5.3 1.05M.

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 Opus 5BarsGLM 5.3Ties
Coding212
Intelligence20
Agentic work140
Reasoning110
Math60
Knowledge90
Web design90
General230
All shared boards952
CodingLike-for-likeFour of these boards feed the Vibe Coding Index212
Coding benchmarks for Claude Opus 5 and GLM 5.3
BenchmarkClaude Opus 5GLM 5.3Leader
LiveBench coding90.8%82.8%Claude Opus 5
LMArena WebDev16891621Claude Opus 5
AA Coding Index78.074.8Claude Opus 5
LiveCodeBench (Vals AI)89.0%80.5%Claude Opus 5
SWE-bench Verified (Vals AI)97.0%95.4%Claude Opus 5
Terminal-Bench 4 (Vals AI)53.5%38.9%Claude Opus 5
Vibe Code Bench (Vals AI)88.4%78.1%Claude Opus 5
Code migration (Vals AI)57.5%44.2%Claude Opus 5
ProgramBench (Vals AI)3.0%1.5%Claude Opus 5
IOI (Vals AI)84.3%68.4%Claude Opus 5
Terminal-Bench 2.1 (Vals AI)84.6%71.5%Claude Opus 5
Vibe Code Bench 1-100 (Vals AI)28.5%20.0%Claude Opus 5
SkillsBench (Vals AI)60.4%47.5%Claude Opus 5
CyberBench (Vals AI)65.4%72.1%GLM 5.3
SciCode56.4%59.0%GLM 5.3
FrontierCode53.4%40.1%Claude Opus 5
FrontierSWE52.0%30.2%Claude Opus 5
WeirdML91.8%75.4%Claude Opus 5
ALE-Bench2164.61317.4Claude Opus 5
LMArena Text: coding15331497Claude Opus 5
LMArena Text: software and IT15271493Claude Opus 5
LMArena WebDev: React17111641Claude Opus 5
LMArena WebDev: HTML16801595Claude Opus 5
LMArena WebDev: from an image1662Not measuredOnly Claude Opus 5 measured
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 5 and GLM 5.3
BenchmarkClaude Opus 5GLM 5.3Leader
AA Intelligence Index50.844.8Claude Opus 5
Epoch Capabilities Index163.9156.0Claude Opus 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index140
Agentic work benchmarks for Claude Opus 5 and GLM 5.3
BenchmarkClaude Opus 5GLM 5.3Leader
AA Agentic Index56.553.1Claude Opus 5
Design Arena: agents building web apps1266Not measuredOnly Claude Opus 5 measured
Design Arena: agents building full-stack apps1306Not measuredOnly Claude Opus 5 measured
Design Arena: agents building mobile apps13481194Claude Opus 5
Design Arena: agents building Android apps1258Not measuredOnly Claude Opus 5 measured
Design Arena: agents building Godot games1279Not measuredOnly Claude Opus 5 measured
Design Arena: agents building games1261Not measuredOnly Claude Opus 5 measured
Design Arena: HTML slidesNot measured1189Only GLM 5.3 measured
Design Arena: PowerPoint slides12651255Claude Opus 5
LiveBench research88.9%73.2%Claude Opus 5
LiveBench browser84.0%0.0%Claude Opus 5
LiveBench long agentic62.1%35.9%Claude Opus 5
SREBench (Vals AI)12.2%9.2%Claude Opus 5
Finance Agent (Vals AI)58.6%55.8%Claude Opus 5
Tax Agent Bench (Vals AI)45.5%39.7%Claude Opus 5
Legal Research Bench (Vals AI)55.3%49.0%Claude Opus 5
Harvey's Legal Agent Benchmark (Vals AI)Not measured14.6%Only GLM 5.3 measured
Excel Modeling Benchmark (Vals AI)73.6%56.3%Claude Opus 5
BioMysteryBench (Vals AI)79.3%Not measuredOnly Claude Opus 5 measured
Terminal-Bench-Science (Vals AI)27.1%5.7%Claude Opus 5
Vals Science Index47.9%Not measuredOnly Claude Opus 5 measured
Time Horizon Index (Vals AI)18.8%Not measuredOnly Claude Opus 5 measured
CUA-bench (Vals AI)9.0%Not measuredOnly Claude Opus 5 measured
APEX-Agents65.8%56.6%Claude Opus 5
OSWorld 2.031.4%Not measuredOnly Claude Opus 5 measured
BALROG63.4%Not measuredOnly Claude Opus 5 measured
PostTrainBench35.0%Not measuredOnly Claude Opus 5 measured
Vending-Bench 2$11,182$8,164Claude Opus 5
LMArena Search1242Not measuredOnly Claude Opus 5 measured
Neither model has a result on the other 10 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index110
Reasoning benchmarks for Claude Opus 5 and GLM 5.3
BenchmarkClaude Opus 5GLM 5.3Leader
GPQA Diamond93.4%88.1%Claude Opus 5
LiveBench reasoning91.2%85.8%Claude Opus 5
MysteryMechanism (Vals AI)37.4%23.0%Claude Opus 5
MMMU Pro (Vals AI)89.9%Not measuredOnly Claude Opus 5 measured
GPQA Diamond (Artificial Analysis run)93.7%91.7%Claude Opus 5
Humanity's Last Exam (Artificial Analysis run)54.9%42.3%Claude Opus 5
GPQA Diamond (Epoch AI run)93.9%90.9%Claude Opus 5
ARC-AGI97.5%Not measuredOnly Claude Opus 5 measured
ARC-AGI-290.4%Not measuredOnly Claude Opus 5 measured
SimpleBench80.6%Not measuredOnly Claude Opus 5 measured
Chess puzzles43.0%37.0%Claude Opus 5
Mystery game puzzles59.0%33.0%Claude Opus 5
EBR-bench45.7%Not measuredOnly Claude Opus 5 measured
LMArena Text: hard prompts15271490Claude Opus 5
LMArena Text: expert15541514Claude Opus 5
LMArena Text: hard prompts in English15231496Claude Opus 5
LMArena Vision: diagrams1348Not measuredOnly Claude Opus 5 measured
LMArena Vision: homework1338Not measuredOnly Claude Opus 5 measured
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Opus 5 and GLM 5.3
BenchmarkClaude Opus 5GLM 5.3Leader
OTIS Mock AIME98.9%91.1%Claude Opus 5
FrontierMath, tiers 1 to 385.6%68.8%Claude Opus 5
FrontierMath, tier 473.2%29.3%Claude Opus 5
ProofBench99.0%49.0%Claude Opus 5
LMArena Text: math15331495Claude Opus 5
LMArena Text: mathematical work15441497Claude Opus 5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index90
Knowledge benchmarks for Claude Opus 5 and GLM 5.3
BenchmarkClaude Opus 5GLM 5.3Leader
MMLU Pro91.6%86.8%Claude Opus 5
LegalBench (Vals AI)87.0%84.8%Claude Opus 5
CorpFin (Vals AI)73.2%Not measuredOnly Claude Opus 5 measured
TaxEval (Vals AI)75.1%72.4%Claude Opus 5
MortgageTax (Vals AI)72.1%Not measuredOnly Claude Opus 5 measured
MedCode (Vals AI)63.6%42.9%Claude Opus 5
SimpleQA Verified59.9%41.0%Claude Opus 5
LMArena Text: science15311498Claude Opus 5
LMArena Text: medicine and healthcare15251481Claude Opus 5
LMArena Text: legal and government15301473Claude Opus 5
LMArena Text: business and finance15011459Claude Opus 5
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index90
Web design benchmarks for Claude Opus 5 and GLM 5.3
BenchmarkClaude Opus 5GLM 5.3Leader
Design Arena: websites13091295Claude Opus 5
Design Arena: UI components13481314Claude Opus 5
Design Arena: game dev13391311Claude Opus 5
Design Arena: data viz13291260Claude Opus 5
Design Arena: 3D13351332Claude Opus 5
Design Arena: all code categories13241304Claude Opus 5
Design Arena: SVG13101292Claude Opus 5
Design Arena: ASCII art13521213Claude Opus 5
LiveBench design83.0%77.3%Claude Opus 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index230
General benchmarks for Claude Opus 5 and GLM 5.3
BenchmarkClaude Opus 5GLM 5.3Leader
Vals IndexNot measured59.7%Only GLM 5.3 measured
LiveBench data analysis74.6%70.2%Claude Opus 5
Public Benefits Bench (Vals AI)76.9%68.5%Claude Opus 5
SAGE (Vals AI)49.4%Not measuredOnly Claude Opus 5 measured
MedScribe (Vals AI)91.0%88.8%Claude Opus 5
Vals Multimodal Index73.9%Not measuredOnly Claude Opus 5 measured
Long context reasoning (AA-LCR)82.0%79.7%Claude Opus 5
DTBench97.9%87.7%Claude Opus 5
LMCA64.5%55.5%Claude Opus 5
Furniture assembly60.8%Not measuredOnly Claude Opus 5 measured
LMArena Text15091474Claude Opus 5
LMArena Text: instruction following15181479Claude Opus 5
LMArena Text: creative writing14931458Claude Opus 5
LMArena Vision1320Not measuredOnly Claude Opus 5 measured
LMArena Text: English15081482Claude Opus 5
LMArena Text: non-English15021459Claude Opus 5
LMArena Text: Chinese15731532Claude Opus 5
LMArena Text: German15271488Claude Opus 5
LMArena Text: Japanese15201460Claude Opus 5
LMArena Text: Korean15171460Claude Opus 5
LMArena Text: French15191503Claude Opus 5
LMArena Text: Spanish15231462Claude Opus 5
LMArena Text: Russian15071469Claude Opus 5
LMArena Text: Polish15221466Claude Opus 5
LMArena Text: multi-turn15001472Claude Opus 5
LMArena Text: longer queries15171483Claude Opus 5
LMArena Text: writing and language14991469Claude Opus 5
LMArena Text: entertainment and media14811447Claude Opus 5
LMArena Vision: English1315Not measuredOnly Claude Opus 5 measured
LMArena Vision: Chinese1400Not measuredOnly Claude Opus 5 measured
LMArena Vision: reading text1329Not measuredOnly Claude Opus 5 measured
LMArena Vision: humor1293Not measuredOnly Claude Opus 5 measured
LMArena Vision: creative writing1313Not measuredOnly Claude Opus 5 measured
LMArena Document1516Not measuredOnly Claude Opus 5 measured
Neither model has a result on the other 12 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 5 and GLM 5.3
BenchmarkClaude Opus 5GLM 5.3Leader
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 Opus 5$0.018Fits in one request
GLM 5.3$0.0008Fits in one request

GLM 5.3 costs less

Repository review

50K input + 3K output tokens

Claude Opus 5$0.325Fits in one request
GLM 5.3$0.0081Fits in one request

GLM 5.3 costs less

Agent loop

200K input + 10K output tokens

Claude Opus 5$1.25Fits in one request
GLM 5.3$0.030Fits in one request

GLM 5.3 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 Opus 5 and GLM 5.3
SpecificationAnthropic Claude Opus 5Z.ai GLM 5.3
MakerAnthropicZ.ai
WeightsNo public weights listedOpen weights
ReleasedJuly 24, 2026August 18, 2026
Context window1M1.05M
Input $/Mtok$5.00$0.079
Output $/Mtok$25.00$1.40
Coding index81.873.1
Independent measurements behind it22
Cost per solved task$1.33$0.36
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 5 better than GLM 5.3 for coding?

Pick Claude Opus 5 for coding: it scores 81.8 on the Vibe Coding Index against 73.1 for GLM 5.3. Pick GLM 5.3 when output tokens cost 17.9x less, or when a solved task costs $0.36 against $1.33.

Which is cheaper, Claude Opus 5 or GLM 5.3?

Claude Opus 5 costs $5.00 per million input tokens and $25.00 per million output tokens; GLM 5.3 costs $0.079 and $1.40. Per solved SWE-bench Verified task, Claude Opus 5 costs $1.33 and GLM 5.3 $0.36.

Which has the bigger context window, Claude Opus 5 or GLM 5.3?

GLM 5.3, with 1.05M tokens against 1M.

How many benchmarks is the Claude Opus 5 vs GLM 5.3 comparison based on?

97 benchmarks have a result for both models as of October 21, 2026. Claude Opus 5's coding index rests on 2 independent benchmarks and GLM 5.3's on 2. Where only one model has a result, the page says so instead of naming a winner.

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