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GLM 5.1 vs Inkling Small

GLM 5.1 leads Inkling Small on coding, 49.2 to 27.3 on the Vibe Coding Index, and Inkling Small costs 3.7x less per output token ($1.20 vs $4.40 per million). Updated October 21, 2026; 60 benchmarks have a result for both.

Replace GLM 5.1 Replace Inkling Small
GLM 5.1Z.ai
Coding
49.2
Overall
57.5
Output $/M
$4.40
48
T Inkling SmallThinking Machines
Coding
27.3
Overall
43.6
Output $/M
$1.20
12
vs boards won of 60 shared

GLM 5.1 or Inkling Small: which to pick

Pick GLM 5.1 for coding: it scores 49.2 on the Vibe Coding Index against 27.3 for Inkling Small, though on 3 benchmarks against 4.

Pick Inkling Small for output tokens 3.7x cheaper ($1.20 vs $4.40 per million) and a lower cost per solved task ($0.16 against $0.60).

Model AGLM 5.1Z.ai49.2/1003 independent benchmarks$0.60 per solved taskModel BInkling SmallThinking Machines27.3/1004 independent benchmarks$0.16 per solved task
Shared results
60
GLM 5.1 only
29
Inkling Small only
24
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 5.1 49.2 from 3 benchmarks, Inkling Small 27.3 from 4 benchmarks.
Widest category
General, 9.1 points apart on average over 20 shared benchmarks.
Widest single gap
LMArena Text: creative writing: GLM 5.1 1453 against Inkling Small 1334, 19.8 points apart on a 0 to 100 scale.
Output price
GLM 5.1 $4.40 against Inkling Small $1.20 per million output tokens, 3.7x apart.
Context window
GLM 5.1 takes 205K tokens, Inkling Small 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 5.1BarsInkling SmallTies
Coding94
Intelligence11
Agentic work30
Reasoning52
Math41
Knowledge82
General182
All shared boards4812
CodingLike-for-likeSix of these boards feed the Vibe Coding Index94
Coding benchmarks for GLM 5.1 and Inkling Small
BenchmarkGLM 5.1Inkling SmallLeader
LMArena WebDev15081409GLM 5.1
AA Coding Index55.852.9GLM 5.1
LiveCodeBench (Vals AI)81.4%85.9%Inkling Small
SWE-bench Verified (Vals AI)76.4%82.2%Inkling Small
Terminal-Bench 4 (Vals AI)Not measured0.0%Only Inkling Small measured
Vibe Code Bench (Vals AI)31.5%19.1%GLM 5.1
Code migration (Vals AI)25.8%13.7%GLM 5.1
ProgramBench (Vals AI)0.0%0.5%Inkling Small
IOI (Vals AI)Not measured9.3%Only Inkling Small measured
Terminal-Bench 2.1 (Vals AI)56.9%55.1%GLM 5.1
SkillsBench (Vals AI)Not measured33.6%Only Inkling Small measured
CyberBench (Vals AI)Not measured64.1%Only Inkling Small measured
SciCode44.8%49.7%Inkling Small
Terminal-Bench Hard (Artificial Analysis run)43.2%Not measuredOnly GLM 5.1 measured
WeirdML57.1%Not measuredOnly GLM 5.1 measured
ALE-Bench887.1Not measuredOnly GLM 5.1 measured
LMArena Text: coding14851450GLM 5.1
LMArena Text: software and IT14841447GLM 5.1
LMArena WebDev: React15051399GLM 5.1
LMArena WebDev: HTML15081398GLM 5.1
LMArena WebDev: from an imageNot measured1410Only Inkling Small measured
Neither model has a result on the other 18 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index11
Intelligence benchmarks for GLM 5.1 and Inkling Small
BenchmarkGLM 5.1Inkling SmallLeader
AA Intelligence Index26.125.7GLM 5.1
Epoch Capabilities Index149.8150.3Inkling Small
Agentic workLike-for-likePublic boards, shown as published, kept out of the index30
Agentic work benchmarks for GLM 5.1 and Inkling Small
BenchmarkGLM 5.1Inkling SmallLeader
AA Agentic Index23.923.5GLM 5.1
Design Arena: agents building web apps1175Not measuredOnly GLM 5.1 measured
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 apps1180Not 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 slides1170Not measuredOnly GLM 5.1 measured
Design Arena: PowerPoint slides1188Not measuredOnly GLM 5.1 measured
Design Arena: spreadsheets1315Not measuredOnly GLM 5.1 measured
Finance Agent (Vals AI)44.8%41.3%GLM 5.1
Tax Agent Bench (Vals AI)Not measured15.4%Only Inkling Small measured
Legal Research Bench (Vals AI)27.9%25.5%GLM 5.1
Harvey's Legal Agent Benchmark (Vals AI)Not measured2.9%Only Inkling Small measured
Excel Modeling Benchmark (Vals AI)Not measured31.8%Only Inkling Small 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 23 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index52
Reasoning benchmarks for GLM 5.1 and Inkling Small
BenchmarkGLM 5.1Inkling SmallLeader
GPQA Diamond84.5%83.6%GLM 5.1
GPQA Diamond (Artificial Analysis run)86.8%89.5%Inkling Small
Humanity's Last Exam (Artificial Analysis run)30.1%33.3%Inkling Small
GPQA Diamond (Epoch AI run)89.9%88.5%GLM 5.1
ARC-AGINot measured84.0%Only Inkling Small measured
ARC-AGI-2Not measured40.1%Only Inkling Small measured
SimpleBench55.1%Not measuredOnly GLM 5.1 measured
Chess puzzles20.0%Not measuredOnly GLM 5.1 measured
Mystery game puzzlesNot measured6.0%Only Inkling Small measured
LMArena Text: hard prompts14731423GLM 5.1
LMArena Text: expert14781441GLM 5.1
LMArena Text: hard prompts in English14821429GLM 5.1
LMArena Vision: diagramsNot measured1251Only Inkling Small measured
LMArena Vision: homeworkNot measured1257Only Inkling Small 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 GLM 5.1 and Inkling Small
BenchmarkGLM 5.1Inkling SmallLeader
AIME91.9%Not measuredOnly GLM 5.1 measured
OTIS Mock AIME93.3%90.0%GLM 5.1
FrontierMath, tiers 1 to 336.8%46.3%Inkling Small
FrontierMath, tier 4Not measured17.1%Only Inkling Small measured
ProofBench22.2%6.0%GLM 5.1
LMArena Text: math14731459GLM 5.1
LMArena Text: mathematical work14701441GLM 5.1
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index82
Knowledge benchmarks for GLM 5.1 and Inkling Small
BenchmarkGLM 5.1Inkling SmallLeader
MMLU Pro86.9%85.6%GLM 5.1
LegalBench (Vals AI)84.4%83.0%GLM 5.1
CaseLaw (Vals AI)51.5%Not measuredOnly GLM 5.1 measured
CorpFin (Vals AI)64.5%69.6%Inkling Small
TaxEval (Vals AI)71.2%75.5%Inkling Small
MortgageTax (Vals AI)Not measured62.3%Only Inkling Small measured
MedCode (Vals AI)41.6%37.9%GLM 5.1
SimpleQA Verified34.0%19.1%GLM 5.1
LMArena Text: science14781428GLM 5.1
LMArena Text: medicine and healthcare14741413GLM 5.1
LMArena Text: legal and government14651415GLM 5.1
LMArena Text: business and finance14521413GLM 5.1
Neither model has a result on the other 6 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
Web design benchmarks for GLM 5.1 and Inkling Small
BenchmarkGLM 5.1Inkling SmallLeader
Design Arena: websites1290Not measuredOnly GLM 5.1 measured
Design Arena: UI components1292Not measuredOnly GLM 5.1 measured
Design Arena: game dev1265Not measuredOnly GLM 5.1 measured
Design Arena: data viz1366Not measuredOnly GLM 5.1 measured
Design Arena: 3D1336Not measuredOnly GLM 5.1 measured
Design Arena: all code categories1268Not measuredOnly GLM 5.1 measured
Design Arena: SVG1218Not measuredOnly GLM 5.1 measured
Design Arena: ASCII art1142Not 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 index182
General benchmarks for GLM 5.1 and Inkling Small
BenchmarkGLM 5.1Inkling SmallLeader
Vals IndexNot measured27.6%Only Inkling Small measured
Public Benefits Bench (Vals AI)61.8%59.4%GLM 5.1
SAGE (Vals AI)Not measured32.7%Only Inkling Small measured
MedScribe (Vals AI)72.3%84.1%Inkling Small
Vals Multimodal IndexNot measured50.0%Only Inkling Small measured
IFBench76.3%Not measuredOnly GLM 5.1 measured
Long context reasoning (AA-LCR)73.7%75.7%Inkling Small
ExploitBench18.1%Not measuredOnly GLM 5.1 measured
LMArena Text14631413GLM 5.1
LMArena Text: instruction following14531399GLM 5.1
LMArena Text: creative writing14531334GLM 5.1
LMArena VisionNot measured1237Only Inkling Small measured
LMArena Text: English14761421GLM 5.1
LMArena Text: non-English14481401GLM 5.1
LMArena Text: Chinese15151464GLM 5.1
LMArena Text: German14671408GLM 5.1
LMArena Text: Japanese14351401GLM 5.1
LMArena Text: Korean14241367GLM 5.1
LMArena Text: French14701435GLM 5.1
LMArena Text: Spanish14681422GLM 5.1
LMArena Text: Russian14541394GLM 5.1
LMArena Text: Polish14491428GLM 5.1
LMArena Text: multi-turn14731416GLM 5.1
LMArena Text: longer queries14671402GLM 5.1
LMArena Text: writing and language14541357GLM 5.1
LMArena Text: entertainment and media14421352GLM 5.1
LMArena Vision: EnglishNot measured1243Only Inkling Small measured
LMArena Vision: ChineseNot measured1292Only Inkling Small measured
LMArena Vision: reading textNot measured1243Only Inkling Small measured
LMArena Vision: humorNot measured1207Only Inkling Small measured
LMArena Vision: creative writingNot measured1205Only Inkling Small measured
Neither model has a result on the other 15 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 Inkling Small
BenchmarkGLM 5.1Inkling SmallLeader
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
Inkling Small$0.0010Fits in one request

Inkling Small costs less

Repository review

50K input + 3K output tokens

GLM 5.1$0.083Fits in one request
Inkling Small$0.026Fits in one request

Inkling Small costs less

Agent loop

200K input + 10K output tokens

GLM 5.1$0.324Exceeds the context window
Inkling Small$0.102Fits in one request

Inkling Small 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 Inkling Small
SpecificationZ.ai GLM 5.1Thinking Machines Inkling Small
MakerZ.aiThinking Machines
WeightsOpen weightsOpen weights
ReleasedApril 7, 2026July 30, 2026
Context window205K524K
Input $/Mtok$1.40$0.45
Output $/Mtok$4.40$1.20
Coding index49.227.3
Independent measurements behind it34
Cost per solved task$0.60$0.16
SourceOpenRouter listingOpenRouter listing

Questions

Is GLM 5.1 better than Inkling Small for coding?

Pick GLM 5.1 for coding: it scores 49.2 on the Vibe Coding Index against 27.3 for Inkling Small, though on 3 benchmarks against 4. Pick Inkling Small for output tokens 3.7x cheaper ($1.20 vs $4.40 per million) and a lower cost per solved task ($0.16 against $0.60).

Which is cheaper, GLM 5.1 or Inkling Small?

GLM 5.1 costs $1.40 per million input tokens and $4.40 per million output tokens; Inkling Small costs $0.45 and $1.20. Per solved SWE-bench Verified task, GLM 5.1 costs $0.60 and Inkling Small $0.16.

Which has the bigger context window, GLM 5.1 or Inkling Small?

Inkling Small, with 524K tokens against 205K.

How many benchmarks is the GLM 5.1 vs Inkling Small comparison based on?

60 benchmarks have a result for both models as of October 21, 2026. GLM 5.1's coding index rests on 3 independent benchmarks and Inkling Small's on 4. Where only one model has a result, the page says so instead of naming a winner.

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