GLM 5.1 vs Grok 4.3

GLM 5.1 leads Grok 4.3 on coding, 49.2 to 37.4 on the Vibe Coding Index, and Grok 4.3 costs 1.8x less per output token ($2.50 vs $4.40 per million). Updated October 21, 2026; 83 benchmarks have a result for both.

Replace GLM 5.1 Replace Grok 4.3

GLM 5.1Z.ai

Coding: 49.2
Overall: 57.5
Output $/M: $4.40

Grok 4.3xAI

Coding: 37.4
Overall: 53.1
Output $/M: $2.50

vs boards won of 83 shared, 3 tied

GLM 5.1 or Grok 4.3: which to pick

Pick GLM 5.1 for coding: it scores 49.2 on the Vibe Coding Index against 37.4 for Grok 4.3.

Pick Grok 4.3 for output tokens 1.8x cheaper ($2.50 vs $4.40 per million) and a lower cost per solved task ($0.31 against $0.60).

Model AGLM 5.1Z.ai49.2/1003 independent benchmarks$0.60 per solved task Model BGrok 4.3xAI37.4/1003 independent benchmarks$0.31 per solved task

83621

Shared results: 83
GLM 5.1 only: 6
Grok 4.3 only: 21
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.

Coding
Vibe Coding Index, six public coding benchmarks
GLM 5.1
GLM 5.1 scores 49.2 against 37.4.
3 benchmarks behind each score
Intelligence
AA Intelligence Index
GLM 5.1
GLM 5.1 leads, 26.1 against 24.9.
Same board, both measured
Agentic work
AA Agentic Index
GLM 5.1
GLM 5.1 leads, 23.9 against 15.5.
Same board, both measured
Reasoning
GPQA Diamond
Grok 4.3
Grok 4.3 leads, 91.4% against 84.5%.
Same board, both measured
Math
AIME
No call
Only GLM 5.1 has a AIME result, 91.9%.
Directional only
Knowledge
MMLU Pro
GLM 5.1
GLM 5.1 leads, 86.9% against 85.8%.
Same board, both measured
Web design
Design Arena: websites
GLM 5.1
GLM 5.1 leads, 1290 against 1196.
Same board, both measured
Long documents
Listed context window
Grok 4.3
Grok 4.3 takes 1M tokens against 205K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Grok 4.3
GLM 5.1 $0.0036, Grok 4.3 $0.0025 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
Grok 4.3
GLM 5.1 $0.60, Grok 4.3 $0.31.
Published attempt cost and pass rate

At a glance

Coding index: GLM 5.1 49.2 from 3 benchmarks, Grok 4.3 37.4 from 3 benchmarks.
Widest category: Agentic work, 16.0 points apart on average over 13 shared benchmarks.
Widest single gap: Vending-Bench 2: GLM 5.1 $5,634 against Grok 4.3 $35, 35.0 points apart on a 0 to 100 scale.
Output price: GLM 5.1 $4.40 against Grok 4.3 $2.50 per million output tokens, 1.8x apart.
Context window: GLM 5.1 takes 205K tokens, Grok 4.3 1M.

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
Category	GLM 5.1	Grok 4.3	Ties
Coding	12	3	1 tie
Intelligence	1	0
Agentic work	12	0	1 tie
Reasoning	5	3
Math	3	1	1 tie
Knowledge	8	3
Web design	8	0
General	18	3
All shared boards	67	13	3 ties

CodingLike-for-likeSix of these boards feed the Vibe Coding Index123

Coding benchmarks for GLM 5.1 and Grok 4.3
Benchmark	GLM 5.1	Grok 4.3	Leader
LMArena WebDev	1508	1358	GLM 5.1
AA Coding Index	55.8	42.2	GLM 5.1
LiveCodeBench (Vals AI)	81.4%	84.5%	Grok 4.3
SWE-bench Verified (Vals AI)	76.4%	71.4%	GLM 5.1
Vibe Code Bench (Vals AI)	31.5%	19.4%	GLM 5.1
Code migration (Vals AI)	25.8%	6.8%	GLM 5.1
ProgramBench (Vals AI)	0.0%	0.0%	Tie
Terminal-Bench 2.1 (Vals AI)	56.9%	42.0%	GLM 5.1
SkillsBench (Vals AI)	Not measured	40.6%	Only Grok 4.3 measured
SciCode	44.8%	48.3%	Grok 4.3
Terminal-Bench Hard (Artificial Analysis run)	43.2%	37.9%	GLM 5.1
WeirdML	57.1%	49.9%	GLM 5.1
ALE-Bench	887.1	944.2	Grok 4.3
LMArena Text: coding	1485	1415	GLM 5.1
LMArena Text: software and IT	1484	1416	GLM 5.1
LMArena WebDev: React	1505	1353	GLM 5.1
LMArena WebDev: HTML	1508	1367	GLM 5.1
LMArena WebDev: from an image	Not measured	1375	Only Grok 4.3 measured
Neither model has a result on the other 21 boards here

IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10

Intelligence benchmarks for GLM 5.1 and Grok 4.3
Benchmark	GLM 5.1	Grok 4.3	Leader
AA Intelligence Index	26.1	24.9	GLM 5.1
Epoch Capabilities Index	149.8	Not measured	Only GLM 5.1 measured

Agentic workLike-for-likePublic boards, shown as published, kept out of the index120

Agentic work benchmarks for GLM 5.1 and Grok 4.3
Benchmark	GLM 5.1	Grok 4.3	Leader
AA Agentic Index	23.9	15.5	GLM 5.1
Design Arena: agents building web apps	1175	1126	GLM 5.1
Design Arena: agents building full-stack apps	1167	1006	GLM 5.1
Design Arena: agents building mobile apps	1162	1059	GLM 5.1
Design Arena: agents building Android apps	1180	961	GLM 5.1
Design Arena: agents building Godot games	1053	914	GLM 5.1
Design Arena: agents building games	1164	1007	GLM 5.1
Design Arena: HTML slides	1170	1008	GLM 5.1
Design Arena: PowerPoint slides	1188	1013	GLM 5.1
Design Arena: spreadsheets	1315	Not measured	Only GLM 5.1 measured
Finance Agent (Vals AI)	44.8%	37.7%	GLM 5.1
Tax Agent Bench (Vals AI)	Not measured	6.2%	Only Grok 4.3 measured
Legal Research Bench (Vals AI)	27.9%	15.4%	GLM 5.1
Excel Modeling Benchmark (Vals AI)	Not measured	18.4%	Only Grok 4.3 measured
τ²-Bench Telecom	97.7%	97.7%	Tie
APEX-Agents	40.9%	Not measured	Only GLM 5.1 measured
Vending-Bench 2	$5,634	$35	GLM 5.1
LMArena Search	Not measured	1166	Only Grok 4.3 measured
Neither model has a result on the other 23 boards here

ReasoningLike-for-likePublic boards, shown as published, kept out of the index53

Reasoning benchmarks for GLM 5.1 and Grok 4.3
Benchmark	GLM 5.1	Grok 4.3	Leader
GPQA Diamond	84.5%	91.4%	Grok 4.3
MMMU Pro (Vals AI)	Not measured	83.1%	Only Grok 4.3 measured
GPQA Diamond (Artificial Analysis run)	86.8%	90.1%	Grok 4.3
Humanity's Last Exam (Artificial Analysis run)	30.1%	37.2%	Grok 4.3
GPQA Diamond (Epoch AI run)	89.9%	88.8%	GLM 5.1
SimpleBench	55.1%	Not measured	Only GLM 5.1 measured
Chess puzzles	20.0%	18.0%	GLM 5.1
LMArena Text: hard prompts	1473	1396	GLM 5.1
LMArena Text: expert	1478	1384	GLM 5.1
LMArena Text: hard prompts in English	1482	1402	GLM 5.1
LMArena Vision: diagrams	Not measured	1241	Only Grok 4.3 measured
LMArena Vision: homework	Not measured	1241	Only Grok 4.3 measured
Neither model has a result on the other 10 boards here

MathLike-for-likePublic boards, shown as published, kept out of the index31

Math benchmarks for GLM 5.1 and Grok 4.3
Benchmark	GLM 5.1	Grok 4.3	Leader
AIME	91.9%	Not measured	Only GLM 5.1 measured
OTIS Mock AIME	93.3%	93.3%	Tie
FrontierMath, tiers 1 to 3	36.8%	42.8%	Grok 4.3
FrontierMath, tier 4	Not measured	14.6%	Only Grok 4.3 measured
ProofBench	22.2%	11.0%	GLM 5.1
LMArena Text: math	1473	1387	GLM 5.1
LMArena Text: mathematical work	1470	1396	GLM 5.1
Neither model has a result on the other 6 boards here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index83

Knowledge benchmarks for GLM 5.1 and Grok 4.3
Benchmark	GLM 5.1	Grok 4.3	Leader
MMLU Pro	86.9%	85.8%	GLM 5.1
LegalBench (Vals AI)	84.4%	84.5%	Grok 4.3
CaseLaw (Vals AI)	51.5%	79.3%	Grok 4.3
CorpFin (Vals AI)	64.5%	68.5%	Grok 4.3
TaxEval (Vals AI)	71.2%	70.8%	GLM 5.1
MortgageTax (Vals AI)	Not measured	48.3%	Only Grok 4.3 measured
MedCode (Vals AI)	41.6%	38.1%	GLM 5.1
SimpleQA Verified	34.0%	33.2%	GLM 5.1
LMArena Text: science	1478	1399	GLM 5.1
LMArena Text: medicine and healthcare	1474	1384	GLM 5.1
LMArena Text: legal and government	1465	1386	GLM 5.1
LMArena Text: business and finance	1452	1381	GLM 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 index80

Web design benchmarks for GLM 5.1 and Grok 4.3
Benchmark	GLM 5.1	Grok 4.3	Leader
Design Arena: websites	1290	1196	GLM 5.1
Design Arena: UI components	1292	1192	GLM 5.1
Design Arena: game dev	1265	1174	GLM 5.1
Design Arena: data viz	1366	1179	GLM 5.1
Design Arena: 3D	1336	1125	GLM 5.1
Design Arena: all code categories	1268	1187	GLM 5.1
Design Arena: SVG	1218	1081	GLM 5.1
Design Arena: ASCII art	1142	1125	GLM 5.1
Neither model has a result on the other 1 board here

GeneralLike-for-likePublic boards, shown as published, kept out of the index183

General benchmarks for GLM 5.1 and Grok 4.3
Benchmark	GLM 5.1	Grok 4.3	Leader
Public Benefits Bench (Vals AI)	61.8%	51.7%	GLM 5.1
SAGE (Vals AI)	Not measured	19.7%	Only Grok 4.3 measured
MedScribe (Vals AI)	72.3%	74.4%	Grok 4.3
Vals Multimodal Index	Not measured	43.3%	Only Grok 4.3 measured
IFBench	76.3%	83.3%	Grok 4.3
Long context reasoning (AA-LCR)	73.7%	75.0%	Grok 4.3
DTBench	Not measured	90.7%	Only Grok 4.3 measured
LMCA	Not measured	38.3%	Only Grok 4.3 measured
ExploitBench	18.1%	Not measured	Only GLM 5.1 measured
LMArena Text	1463	1397	GLM 5.1
LMArena Text: instruction following	1453	1366	GLM 5.1
LMArena Text: creative writing	1453	1380	GLM 5.1
LMArena Vision	Not measured	1229	Only Grok 4.3 measured
LMArena Text: English	1476	1404	GLM 5.1
LMArena Text: non-English	1448	1385	GLM 5.1
LMArena Text: Chinese	1515	1422	GLM 5.1
LMArena Text: German	1467	1395	GLM 5.1
LMArena Text: Japanese	1435	1379	GLM 5.1
LMArena Text: Korean	1424	1354	GLM 5.1
LMArena Text: French	1470	1411	GLM 5.1
LMArena Text: Spanish	1468	1399	GLM 5.1
LMArena Text: Russian	1454	1399	GLM 5.1
LMArena Text: Polish	1449	1398	GLM 5.1
LMArena Text: multi-turn	1473	1406	GLM 5.1
LMArena Text: longer queries	1467	1393	GLM 5.1
LMArena Text: writing and language	1454	1385	GLM 5.1
LMArena Text: entertainment and media	1442	1370	GLM 5.1
LMArena Vision: English	Not measured	1235	Only Grok 4.3 measured
LMArena Vision: Chinese	Not measured	1257	Only Grok 4.3 measured
LMArena Vision: reading text	Not measured	1235	Only Grok 4.3 measured
LMArena Vision: humor	Not measured	1222	Only Grok 4.3 measured
LMArena Vision: recognizing things	Not measured	1217	Only Grok 4.3 measured
LMArena Vision: creative writing	Not measured	1237	Only Grok 4.3 measured
Neither model has a result on the other 13 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 Grok 4.3
Benchmark	GLM 5.1	Grok 4.3	Leader
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

Grok 4.3$0.0025Fits in one request

Grok 4.3 costs less

Repository review

50K input + 3K output tokens

GLM 5.1$0.083Fits in one request

Grok 4.3$0.070Fits in one request

Grok 4.3 costs less

Agent loop

200K input + 10K output tokens

GLM 5.1$0.324Exceeds the context window

Grok 4.3$0.275Fits in one request

Grok 4.3 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 GLM 5.1 and Grok 4.3
Specification	Z.ai GLM 5.1	SpaceXAI Grok 4.3
Maker	Z.ai	xAI
Weights	Open weights	No public weights listed
Released	April 7, 2026	April 30, 2026
Context window	205K	1M
Input $/Mtok	$1.40	$1.25
Output $/Mtok	$4.40	$2.50
Coding index	49.2	37.4
Independent measurements behind it	3	3
Cost per solved task	$0.60	$0.31
Source	OpenRouter listing	OpenRouter listing

Questions

Is GLM 5.1 better than Grok 4.3 for coding?

Pick GLM 5.1 for coding: it scores 49.2 on the Vibe Coding Index against 37.4 for Grok 4.3. Pick Grok 4.3 for output tokens 1.8x cheaper ($2.50 vs $4.40 per million) and a lower cost per solved task ($0.31 against $0.60).

Which is cheaper, GLM 5.1 or Grok 4.3?

GLM 5.1 costs $1.40 per million input tokens and $4.40 per million output tokens; Grok 4.3 costs $1.25 and $2.50. Per solved SWE-bench Verified task, GLM 5.1 costs $0.60 and Grok 4.3 $0.31.

Which has the bigger context window, GLM 5.1 or Grok 4.3?

Grok 4.3, with 1M tokens against 205K.

How many benchmarks is the GLM 5.1 vs Grok 4.3 comparison based on?

83 benchmarks have a result for both models as of October 21, 2026. GLM 5.1's coding index rests on 3 independent benchmarks and Grok 4.3's on 3. Where only one model has a result, the page says so instead of naming a winner.

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GLM 5.1 or Grok 4.3: which to pick

Which one for your work

Coding

Intelligence

Agentic work

Reasoning

Math

Knowledge

Web design

Long documents

Everyday cost

Cost per solved task

At a glance

Benchmark by benchmark

What each workload costs

Chat turn

Repository review

Agent loop

Specification differences

Questions

Compare next