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Claude Opus 4.1 vs Inkling Small

Updated October 21, 2026. 46 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Opus 4.1 Replace Inkling Small
Claude Opus 4.1Anthropic
Coding
27.2
Overall
22.8
Output $/M
$75.00
24
T Inkling SmallThinking Machines
Coding
29.9
Overall
25.7
Output $/M
$1.20
22
vs boards won of 46 shared

Decision reading

Pick Inkling Small for coding: it scores 29.9 on the Vibe Coding Index against 27.2 for Claude Opus 4.1.

Pick Claude Opus 4.1 when what matters is LMArena Text: coding or LMArena Text: software and IT, where it leads.

Model AClaude Opus 4.1Anthropic27.2/1001 independent benchmarkNo cost per solved taskModel BInkling SmallThinking Machines29.9/1001 independent benchmark$0.16 per solved task
Shared results
46
Claude Opus 4.1 only
25
Inkling Small only
38
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
Claude Opus 4.1 27.2 from 1 benchmark, Inkling Small 29.9 from 1 benchmark.
Widest category
Math, 15.1 points apart on average over 5 shared benchmarks.
Widest single gap
FrontierMath, tiers 1 to 3: Claude Opus 4.1 12.6% against Inkling Small 46.3%, 33.7 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.1 $75.00 against Inkling Small $1.20 per million output tokens, 62.5x apart.
Context window
Claude Opus 4.1 takes 200K 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
CategoryClaude Opus 4.1BarsInkling SmallTies
Coding32
Intelligence02
Reasoning33
Math05
Knowledge54
General136
All shared boards2422
CodingLike-for-likeFour of these boards feed the Vibe Coding Index32
Coding benchmarks for Claude Opus 4.1 and Inkling Small
BenchmarkClaude Opus 4.1Inkling SmallLeader
LMArena WebDev13901409Inkling Small
AA Coding IndexNot measured52.9Only Inkling Small measured
LiveCodeBench (Vals AI)66.5%85.9%Inkling Small
SWE-bench Verified (Vals AI)Not measured82.2%Only Inkling Small measured
Terminal-Bench 4 (Vals AI)Not measured0.0%Only Inkling Small measured
Vibe Code Bench (Vals AI)Not measured19.1%Only Inkling Small measured
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
SciCodeNot measured49.7%Only Inkling Small measured
Terminal-Bench38.0%Not measuredOnly Claude Opus 4.1 measured
WeirdML45.9%Not measuredOnly Claude Opus 4.1 measured
Cybench42.0%Not measuredOnly Claude Opus 4.1 measured
LMArena Text: coding14791450Claude Opus 4.1
LMArena Text: software and IT14561447Claude Opus 4.1
LMArena WebDev: ReactNot measured1399Only Inkling Small measured
LMArena WebDev: HTML13991398Claude Opus 4.1
LMArena WebDev: from an imageNot measured1410Only Inkling Small measured
Neither model has a result on the other 17 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Claude Opus 4.1 and Inkling Small
BenchmarkClaude Opus 4.1Inkling SmallLeader
AA Intelligence Index22.825.7Inkling Small
Epoch Capabilities Index144.1150.3Inkling Small
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index9 boards, none shared
Agentic work benchmarks for Claude Opus 4.1 and Inkling Small
BenchmarkClaude Opus 4.1Inkling 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
METR time horizons66.8%Not measuredOnly Claude Opus 4.1 measured
GDPval43.6%Not measuredOnly Claude Opus 4.1 measured
DeepResearch Bench48.3%Not measuredOnly Claude Opus 4.1 measured
Neither model has a result on the other 30 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index33
Reasoning benchmarks for Claude Opus 4.1 and Inkling Small
BenchmarkClaude Opus 4.1Inkling SmallLeader
GPQA Diamond76.3%83.6%Inkling Small
MMMU Pro (Vals AI)77.5%Not measuredOnly Claude Opus 4.1 measured
GPQA Diamond (Artificial Analysis run)Not measured89.5%Only Inkling Small measured
Humanity's Last Exam (Artificial Analysis run)Not measured33.3%Only Inkling Small measured
GPQA Diamond (Epoch AI run)77.3%88.5%Inkling Small
ARC-AGINot measured84.0%Only Inkling Small measured
ARC-AGI-2Not measured40.1%Only Inkling Small measured
SimpleBench60.0%Not measuredOnly Claude Opus 4.1 measured
Mystery game puzzles21.0%6.0%Claude Opus 4.1
EBR-bench7.9%Not measuredOnly Claude Opus 4.1 measured
VPCT35.0%Not measuredOnly Claude Opus 4.1 measured
LMArena Text: hard prompts14421423Claude Opus 4.1
LMArena Text: expert14381441Inkling Small
LMArena Text: hard prompts in English14511429Claude Opus 4.1
LMArena Vision: diagramsNot measured1251Only Inkling Small measured
LMArena Vision: homeworkNot measured1257Only Inkling Small measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index05
Math benchmarks for Claude Opus 4.1 and Inkling Small
BenchmarkClaude Opus 4.1Inkling SmallLeader
AIME78.2%Not measuredOnly Claude Opus 4.1 measured
MATH 500 (Vals AI)95.4%Not measuredOnly Claude Opus 4.1 measured
MGSM (Vals AI)94.4%Not measuredOnly Claude Opus 4.1 measured
OTIS Mock AIME68.9%90.0%Inkling Small
FrontierMath, tiers 1 to 312.6%46.3%Inkling Small
FrontierMath, tier 42.4%17.1%Inkling Small
ProofBenchNot measured6.0%Only Inkling Small measured
LMArena Text: math14311459Inkling Small
LMArena Text: mathematical work14341441Inkling Small
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index54
Knowledge benchmarks for Claude Opus 4.1 and Inkling Small
BenchmarkClaude Opus 4.1Inkling SmallLeader
MMLU Pro87.9%85.6%Claude Opus 4.1
LegalBench (Vals AI)83.5%83.0%Claude Opus 4.1
CorpFin (Vals AI)Not measured69.6%Only Inkling Small measured
TaxEval (Vals AI)73.7%75.5%Inkling Small
MortgageTax (Vals AI)61.1%62.3%Inkling Small
MedQA (Vals AI)93.6%Not measuredOnly Claude Opus 4.1 measured
MedCode (Vals AI)47.2%37.9%Claude Opus 4.1
SimpleQA VerifiedNot measured19.1%Only Inkling Small measured
LMArena Text: science14221428Inkling Small
LMArena Text: medicine and healthcare14161413Claude Opus 4.1
LMArena Text: legal and government14211415Claude Opus 4.1
LMArena Text: business and finance14061413Inkling Small
Neither model has a result on the other 5 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
Web design benchmarks for Claude Opus 4.1 and Inkling Small
BenchmarkClaude Opus 4.1Inkling SmallLeader
Design Arena: websites1177Not measuredOnly Claude Opus 4.1 measured
Design Arena: UI components1164Not measuredOnly Claude Opus 4.1 measured
Design Arena: game dev1172Not measuredOnly Claude Opus 4.1 measured
Design Arena: data viz1166Not measuredOnly Claude Opus 4.1 measured
Design Arena: 3D1153Not measuredOnly Claude Opus 4.1 measured
Design Arena: all code categories1171Not measuredOnly Claude Opus 4.1 measured
Design Arena: SVG1152Not measuredOnly Claude Opus 4.1 measured
Design Arena: ASCII art1167Not measuredOnly Claude Opus 4.1 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index136
General benchmarks for Claude Opus 4.1 and Inkling Small
BenchmarkClaude Opus 4.1Inkling SmallLeader
Vals IndexNot measured27.6%Only Inkling Small measured
Public Benefits Bench (Vals AI)Not measured59.4%Only Inkling Small measured
SAGE (Vals AI)31.4%32.7%Inkling Small
MedScribe (Vals AI)73.9%84.1%Inkling Small
Vals Multimodal IndexNot measured50.0%Only Inkling Small measured
Long context reasoning (AA-LCR)Not measured75.7%Only Inkling Small measured
DTBench80.0%Not measuredOnly Claude Opus 4.1 measured
LMCA37.1%Not measuredOnly Claude Opus 4.1 measured
Creative writing (Lech Mazur)84.7%Not measuredOnly Claude Opus 4.1 measured
LMArena Text14191413Claude Opus 4.1
LMArena Text: instruction following14351399Claude Opus 4.1
LMArena Text: creative writing14121334Claude Opus 4.1
LMArena VisionNot measured1237Only Inkling Small measured
LMArena Text: English14331421Claude Opus 4.1
LMArena Text: non-English14051401Claude Opus 4.1
LMArena Text: Chinese14271464Inkling Small
LMArena Text: German14131408Claude Opus 4.1
LMArena Text: Japanese13771401Inkling Small
LMArena Text: Korean13811367Claude Opus 4.1
LMArena Text: French14331435Inkling Small
LMArena Text: Spanish14481422Claude Opus 4.1
LMArena Text: Russian14221394Claude Opus 4.1
LMArena Text: Polish14131428Inkling Small
LMArena Text: multi-turn14441416Claude Opus 4.1
LMArena Text: longer queries14551402Claude Opus 4.1
LMArena Text: writing and language14181357Claude Opus 4.1
LMArena Text: entertainment and media13981352Claude Opus 4.1
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 14 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 4.1 and Inkling Small
BenchmarkClaude Opus 4.1Inkling 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

Claude Opus 4.1$0.052Fits in one request
Inkling Small$0.0010Fits in one request

Inkling Small costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.1$0.975Fits in one request
Inkling Small$0.026Fits in one request

Inkling Small costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.1$3.75Exceeds 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 Claude Opus 4.1 and Inkling Small
SpecificationAnthropic Claude Opus 4.1Thinking Machines Inkling Small
MakerAnthropicThinking Machines
WeightsNo public weights listedOpen weights
ReleasedAugust 5, 2025July 30, 2026
Context window200K524K
Input $/Mtok$15.00$0.45
Output $/Mtok$75.00$1.20
Coding index27.229.9
Independent measurements behind it11
Cost per solved taskNot computable$0.16
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.1 better than Inkling Small for coding?

Pick Inkling Small for coding: it scores 29.9 on the Vibe Coding Index against 27.2 for Claude Opus 4.1. Pick Claude Opus 4.1 when what matters is LMArena Text: coding or LMArena Text: software and IT, where it leads.

Which is cheaper, Claude Opus 4.1 or Inkling Small?

Claude Opus 4.1 costs $15.00 per million input tokens and $75.00 per million output tokens; Inkling Small costs $0.45 and $1.20. Cost per solved task is known for Inkling Small only.

Which has the bigger context window, Claude Opus 4.1 or Inkling Small?

Inkling Small, with 524K tokens against 200K.

How many benchmarks is the Claude Opus 4.1 vs Inkling Small comparison based on?

46 benchmarks have a result for both models as of October 21, 2026. Claude Opus 4.1's coding index rests on 1 independent benchmark 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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