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GPT-5.1 vs Inkling Small

Updated October 21, 2026. 64 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace GPT-5.1 Replace Inkling Small
GPT-5.1OpenAI
Coding
53.3
Overall
24.7
Output $/M
$10.00
47
T Inkling SmallThinking Machines
Coding
29.9
Overall
25.7
Output $/M
$1.20
17
vs boards won of 64 shared

Decision reading

Pick GPT-5.1 for coding: it scores 53.3 on the Vibe Coding Index against 29.9 for Inkling Small.

Pick Inkling Small when output tokens cost 8.3x less, or when a solved task costs $0.16 against $1.02.

Model AGPT-5.1OpenAI53.3/1002 independent benchmarks$1.02 per solved taskModel BInkling SmallThinking Machines29.9/1001 independent benchmark$0.16 per solved task
Shared results
64
GPT-5.1 only
36
Inkling Small only
20
Like-for-like categories
6 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
GPT-5.1 53.3 from 2 benchmarks, Inkling Small 29.9 from 1 benchmark.
Widest category
Knowledge, 7.0 points apart on average over 11 shared benchmarks.
Widest single gap
SimpleQA Verified: GPT-5.1 48.0% against Inkling Small 19.1%, 28.9 points apart on a 0 to 100 scale.
Output price
GPT-5.1 $10.00 against Inkling Small $1.20 per million output tokens, 8.3x apart.
Context window
GPT-5.1 takes 400K 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
CategoryGPT-5.1BarsInkling SmallTies
Coding64
Intelligence02
Reasoning75
Math12
Knowledge83
General251
All shared boards4717
CodingLike-for-likeFour of these boards feed the Vibe Coding Index64
Coding benchmarks for GPT-5.1 and Inkling Small
BenchmarkGPT-5.1Inkling SmallLeader
SWE-bench Verified66.0%Not measuredOnly GPT-5.1 measured
LMArena WebDev13961409Inkling Small
AA Coding Index49.452.9Inkling Small
LiveCodeBench (Vals AI)86.5%85.9%GPT-5.1
SWE-bench Verified (Vals AI)69.8%82.2%Inkling Small
Terminal-Bench 4 (Vals AI)Not measured0.0%Only Inkling Small measured
Vibe Code Bench (Vals AI)24.6%19.1%GPT-5.1
Code migration (Vals AI)Not measured13.7%Only Inkling Small measured
ProgramBench (Vals AI)Not measured0.5%Only Inkling Small measured
IOI (Vals AI)Not measured9.3%Only Inkling Small measured
Terminal-Bench 2.1 (Vals AI)Not measured55.1%Only Inkling Small measured
SkillsBench (Vals AI)Not measured33.6%Only Inkling Small measured
CyberBench (Vals AI)Not measured64.1%Only Inkling Small measured
LiveCodeBench (Artificial Analysis run)86.8%Not measuredOnly GPT-5.1 measured
SciCodeNot measured49.7%Only Inkling Small measured
Terminal-Bench Hard (Artificial Analysis run)45.5%Not measuredOnly GPT-5.1 measured
Terminal-Bench47.6%Not measuredOnly GPT-5.1 measured
GSO-Bench13.7%Not measuredOnly GPT-5.1 measured
WeirdML60.8%Not measuredOnly GPT-5.1 measured
LMArena Text: coding14531450GPT-5.1
LMArena Text: software and IT14541447GPT-5.1
LMArena WebDev: React13071399Inkling Small
LMArena WebDev: HTML14051398GPT-5.1
LMArena WebDev: from an image14211410GPT-5.1
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for GPT-5.1 and Inkling Small
BenchmarkGPT-5.1Inkling SmallLeader
AA Intelligence Index24.725.7Inkling Small
Epoch Capabilities Index149.8150.3Inkling Small
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index9 boards, none shared
Agentic work benchmarks for GPT-5.1 and Inkling Small
BenchmarkGPT-5.1Inkling SmallLeader
AA Agentic IndexNot measured23.5Only Inkling Small measured
Finance Agent (Vals AI)Not measured41.3%Only Inkling Small measured
Tax Agent Bench (Vals AI)Not measured15.4%Only Inkling Small measured
Legal Research Bench (Vals AI)Not measured25.5%Only Inkling Small measured
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 Telecom81.9%Not measuredOnly GPT-5.1 measured
DeepResearch Bench42.8%Not measuredOnly GPT-5.1 measured
Vending-Bench 2$1,473Not measuredOnly GPT-5.1 measured
Neither model has a result on the other 30 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index75
Reasoning benchmarks for GPT-5.1 and Inkling Small
BenchmarkGPT-5.1Inkling SmallLeader
GPQA Diamond86.6%83.6%GPT-5.1
MMMU Pro (Vals AI)83.2%Not measuredOnly GPT-5.1 measured
GPQA Diamond (Artificial Analysis run)87.3%89.5%Inkling Small
Humanity's Last Exam (Artificial Analysis run)28.5%33.3%Inkling Small
GPQA Diamond (Epoch AI run)87.6%88.5%Inkling Small
ARC-AGI72.8%84.0%Inkling Small
ARC-AGI-217.6%40.1%Inkling Small
SimpleBench53.2%Not measuredOnly GPT-5.1 measured
Chess puzzles42.0%Not measuredOnly GPT-5.1 measured
Mystery game puzzles19.0%6.0%GPT-5.1
VPCT58.7%Not measuredOnly GPT-5.1 measured
LMArena Text: hard prompts14571423GPT-5.1
LMArena Text: expert14701441GPT-5.1
LMArena Text: hard prompts in English14621429GPT-5.1
LMArena Vision: diagrams12641251GPT-5.1
LMArena Vision: homework12721257GPT-5.1
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index12
Math benchmarks for GPT-5.1 and Inkling Small
BenchmarkGPT-5.1Inkling SmallLeader
AIME93.3%Not measuredOnly GPT-5.1 measured
MGSM (Vals AI)93.0%Not measuredOnly GPT-5.1 measured
AA Math Index94.0Not measuredOnly GPT-5.1 measured
AIME 2025 (Artificial Analysis run)94.0%Not measuredOnly GPT-5.1 measured
OTIS Mock AIME88.6%90.0%Inkling Small
FrontierMath, tiers 1 to 3Not measured46.3%Only Inkling Small measured
FrontierMath, tier 4Not measured17.1%Only Inkling Small measured
ProofBenchNot measured6.0%Only Inkling Small measured
LMArena Text: math14461459Inkling Small
LMArena Text: mathematical work14491441GPT-5.1
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index83
Knowledge benchmarks for GPT-5.1 and Inkling Small
BenchmarkGPT-5.1Inkling SmallLeader
MMLU Pro86.4%85.6%GPT-5.1
LegalBench (Vals AI)85.7%83.0%GPT-5.1
CaseLaw (Vals AI)73.4%Not measuredOnly GPT-5.1 measured
CorpFin (Vals AI)63.8%69.6%Inkling Small
TaxEval (Vals AI)74.9%75.5%Inkling Small
MortgageTax (Vals AI)61.4%62.3%Inkling Small
MedQA (Vals AI)96.4%Not measuredOnly GPT-5.1 measured
MedCode (Vals AI)52.7%37.9%GPT-5.1
MMLU Pro (Artificial Analysis run)87.0%Not measuredOnly GPT-5.1 measured
SimpleQA Verified48.0%19.1%GPT-5.1
LMArena Text: science14591428GPT-5.1
LMArena Text: medicine and healthcare14561413GPT-5.1
LMArena Text: legal and government14591415GPT-5.1
LMArena Text: business and finance14311413GPT-5.1
Neither model has a result on the other 3 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
Web design benchmarks for GPT-5.1 and Inkling Small
BenchmarkGPT-5.1Inkling SmallLeader
Design Arena: websites1187Not measuredOnly GPT-5.1 measured
Design Arena: UI components1166Not measuredOnly GPT-5.1 measured
Design Arena: game dev1179Not measuredOnly GPT-5.1 measured
Design Arena: data viz1204Not measuredOnly GPT-5.1 measured
Design Arena: 3D1061Not measuredOnly GPT-5.1 measured
Design Arena: all code categories1171Not measuredOnly GPT-5.1 measured
Design Arena: SVG1149Not measuredOnly GPT-5.1 measured
Design Arena: ASCII art1118Not measuredOnly GPT-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 index251
General benchmarks for GPT-5.1 and Inkling Small
BenchmarkGPT-5.1Inkling SmallLeader
Vals IndexNot measured27.6%Only Inkling Small measured
Public Benefits Bench (Vals AI)Not measured59.4%Only Inkling Small measured
SAGE (Vals AI)43.2%32.7%GPT-5.1
MedScribe (Vals AI)88.1%84.1%GPT-5.1
Vals Multimodal IndexNot measured50.0%Only Inkling Small measured
IFBench72.9%Not measuredOnly GPT-5.1 measured
Long context reasoning (AA-LCR)80.0%75.7%GPT-5.1
DTBench90.1%Not measuredOnly GPT-5.1 measured
LMCA43.9%Not measuredOnly GPT-5.1 measured
CL-bench23.7%Not measuredOnly GPT-5.1 measured
CL-bench Life17.3%Not measuredOnly GPT-5.1 measured
LMArena Text14431413GPT-5.1
LMArena Text: instruction following14431399GPT-5.1
LMArena Text: creative writing14271334GPT-5.1
LMArena Vision12501237GPT-5.1
LMArena Text: English14511421GPT-5.1
LMArena Text: non-English14311401GPT-5.1
LMArena Text: Chinese14951464GPT-5.1
LMArena Text: German14381408GPT-5.1
LMArena Text: Japanese14531401GPT-5.1
LMArena Text: Korean14011367GPT-5.1
LMArena Text: French14501435GPT-5.1
LMArena Text: Spanish14331422GPT-5.1
LMArena Text: Russian14351394GPT-5.1
LMArena Text: Polish14401428GPT-5.1
LMArena Text: multi-turn14501416GPT-5.1
LMArena Text: longer queries14481402GPT-5.1
LMArena Text: writing and language14281357GPT-5.1
LMArena Text: entertainment and media14151352GPT-5.1
LMArena Vision: English12521243GPT-5.1
LMArena Vision: Chinese12701292Inkling Small
LMArena Vision: reading text12551243GPT-5.1
LMArena Vision: humor12631207GPT-5.1
LMArena Vision: captioning1252Not measuredOnly GPT-5.1 measured
LMArena Vision: recognizing things1232Not measuredOnly GPT-5.1 measured
LMArena Vision: creative writing12661205GPT-5.1
LMArena Document1403Not measuredOnly GPT-5.1 measured
Neither model has a result on the other 9 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-5.1 and Inkling Small
BenchmarkGPT-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

GPT-5.1$0.0063Fits in one request
Inkling Small$0.0010Fits in one request

Inkling Small costs less

Repository review

50K input + 3K output tokens

GPT-5.1$0.092Fits in one request
Inkling Small$0.026Fits in one request

Inkling Small costs less

Agent loop

200K input + 10K output tokens

GPT-5.1$0.350Fits in one request
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 GPT-5.1 and Inkling Small
SpecificationOpenAI GPT-5.1Thinking Machines Inkling Small
MakerOpenAIThinking Machines
WeightsNo public weights listedOpen weights
ReleasedNovember 13, 2025July 30, 2026
Context window400K524K
Input $/Mtok$1.25$0.45
Output $/Mtok$10.00$1.20
Coding index53.329.9
Independent measurements behind it21
Cost per solved task$1.02$0.16
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.1 better than Inkling Small for coding?

Pick GPT-5.1 for coding: it scores 53.3 on the Vibe Coding Index against 29.9 for Inkling Small. Pick Inkling Small when output tokens cost 8.3x less, or when a solved task costs $0.16 against $1.02.

Which is cheaper, GPT-5.1 or Inkling Small?

GPT-5.1 costs $1.25 per million input tokens and $10.00 per million output tokens; Inkling Small costs $0.45 and $1.20. Per solved SWE-bench Verified task, GPT-5.1 costs $1.02 and Inkling Small $0.16.

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

Inkling Small, with 524K tokens against 400K.

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

64 benchmarks have a result for both models as of October 21, 2026. GPT-5.1's coding index rests on 2 independent benchmarks and Inkling Small's on 1. Where only one model has a result, the page says so instead of naming a winner.

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