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Claude Sonnet 5.5 vs Inkling

Updated October 21, 2026. 77 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Sonnet 5.5 Replace Inkling
Claude Sonnet 5.5Anthropic
Coding
88.9
Overall
56.0
Output $/M
$10.00
75
T InklingThinking Machines
Coding
49.7
Overall
25.0
Output $/M
$4.05
2
vs boards won of 77 shared

Decision reading

Pick Claude Sonnet 5.5 for coding: it scores 88.9 on the Vibe Coding Index against 49.7 for Inkling.

Pick Inkling when output tokens cost 2.5x less, or when what matters is CyberBench (Vals AI) or LiveBench data analysis, where it leads.

Model AClaude Sonnet 5.5Anthropic88.9/1002 independent benchmarksNo cost per solved taskModel BInklingThinking Machines49.7/1002 independent benchmarks$0.76 per solved task
Shared results
77
Claude Sonnet 5.5 only
18
Inkling only
25
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 Sonnet 5.5 88.9 from 2 benchmarks, Inkling 49.7 from 2 benchmarks.
Widest category
Math, 42.2 points apart on average over 6 shared benchmarks.
Widest single gap
ProofBench: Claude Sonnet 5.5 100.0% against Inkling 0.0%, 100.0 points apart on a 0 to 100 scale.
Output price
Claude Sonnet 5.5 $10.00 against Inkling $4.05 per million output tokens, 2.5x apart.
Context window
Claude Sonnet 5.5 takes 1M tokens, Inkling 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 Sonnet 5.5BarsInklingTies
Coding161
Intelligence20
Agentic work110
Reasoning70
Math60
Knowledge60
Web design70
General201
All shared boards752
CodingLike-for-likeFour of these boards feed the Vibe Coding Index161
Coding benchmarks for Claude Sonnet 5.5 and Inkling
BenchmarkClaude Sonnet 5.5InklingLeader
LiveBench coding94.7%64.0%Claude Sonnet 5.5
LMArena WebDev17681414Claude Sonnet 5.5
AA Coding IndexNot measured52.1Only Inkling measured
LiveCodeBench (Vals AI)Not measured85.5%Only Inkling measured
SWE-bench Verified (Vals AI)Not measured77.6%Only Inkling measured
Terminal-Bench 4 (Vals AI)64.1%0.5%Claude Sonnet 5.5
Vibe Code Bench (Vals AI)92.4%19.2%Claude Sonnet 5.5
Code migration (Vals AI)69.8%11.8%Claude Sonnet 5.5
ProgramBench (Vals AI)6.5%0.0%Claude Sonnet 5.5
IOI (Vals AI)83.1%14.9%Claude Sonnet 5.5
Terminal-Bench 2.1 (Vals AI)83.2%47.6%Claude Sonnet 5.5
SWE-bench Multimodal (Vals AI)58.3%Not measuredOnly Claude Sonnet 5.5 measured
Vibe Code Bench 1-100 (Vals AI)Not measured7.3%Only Inkling measured
SkillsBench (Vals AI)Not measured26.1%Only Inkling measured
CyberBench (Vals AI)59.6%66.8%Inkling
SciCode61.0%47.0%Claude Sonnet 5.5
FrontierCode52.1%14.0%Claude Sonnet 5.5
FrontierSWE61.9%4.1%Claude Sonnet 5.5
WeirdMLNot measured32.3%Only Inkling measured
ALE-Bench1819.1946.0Claude Sonnet 5.5
LMArena Text: coding15131466Claude Sonnet 5.5
LMArena Text: software and IT15041465Claude Sonnet 5.5
LMArena WebDev: React18171404Claude Sonnet 5.5
LMArena WebDev: HTML17411399Claude Sonnet 5.5
LMArena WebDev: from an image1737Not measuredOnly Claude Sonnet 5.5 measured
Neither model has a result on the other 13 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Sonnet 5.5 and Inkling
BenchmarkClaude Sonnet 5.5InklingLeader
AA Intelligence Index56.025.0Claude Sonnet 5.5
Epoch Capabilities Index166.2148.4Claude Sonnet 5.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index110
Agentic work benchmarks for Claude Sonnet 5.5 and Inkling
BenchmarkClaude Sonnet 5.5InklingLeader
AA Agentic IndexNot measured22.5Only Inkling measured
Design Arena: agents building web apps13031196Claude Sonnet 5.5
Design Arena: agents building mobile apps1265Not measuredOnly Claude Sonnet 5.5 measured
Design Arena: spreadsheets1245Not measuredOnly Claude Sonnet 5.5 measured
LiveBench research83.6%59.9%Claude Sonnet 5.5
LiveBench browser84.0%16.0%Claude Sonnet 5.5
LiveBench long agentic78.8%14.1%Claude Sonnet 5.5
SREBench (Vals AI)30.1%0.0%Claude Sonnet 5.5
Finance Agent (Vals AI)58.1%46.6%Claude Sonnet 5.5
Tax Agent Bench (Vals AI)42.0%15.3%Claude Sonnet 5.5
Legal Research Bench (Vals AI)48.1%28.4%Claude Sonnet 5.5
Harvey's Legal Agent Benchmark (Vals AI)10.4%3.8%Claude Sonnet 5.5
Excel Modeling Benchmark (Vals AI)75.7%38.4%Claude Sonnet 5.5
BioMysteryBench (Vals AI)81.1%Not measuredOnly Claude Sonnet 5.5 measured
Terminal-Bench-Science (Vals AI)47.1%Not measuredOnly Claude Sonnet 5.5 measured
Vals Science Index59.1%Not measuredOnly Claude Sonnet 5.5 measured
APEX-Agents75.5%33.8%Claude Sonnet 5.5
SpireClimb1.3%Not measuredOnly Claude Sonnet 5.5 measured
Vending-Bench 2$11,165Not measuredOnly Claude Sonnet 5.5 measured
Neither model has a result on the other 20 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index70
Reasoning benchmarks for Claude Sonnet 5.5 and Inkling
BenchmarkClaude Sonnet 5.5InklingLeader
GPQA DiamondNot measured87.1%Only Inkling measured
LiveBench reasoning91.6%78.3%Claude Sonnet 5.5
MysteryMechanism (Vals AI)49.1%Not measuredOnly Claude Sonnet 5.5 measured
MMMU Pro (Vals AI)Not measured78.5%Only Inkling measured
GPQA Diamond (Artificial Analysis run)Not measured87.2%Only Inkling measured
Humanity's Last Exam (Artificial Analysis run)55.0%31.9%Claude Sonnet 5.5
GPQA Diamond (Epoch AI run)95.6%88.3%Claude Sonnet 5.5
ARC-AGINot measured79.5%Only Inkling measured
ARC-AGI-2Not measured36.5%Only Inkling measured
SimpleBenchNot measured50.0%Only Inkling measured
Chess puzzles59.0%21.0%Claude Sonnet 5.5
Mystery game puzzles65.0%Not measuredOnly Claude Sonnet 5.5 measured
LMArena Text: hard prompts14941451Claude Sonnet 5.5
LMArena Text: expert15311466Claude Sonnet 5.5
LMArena Text: hard prompts in English15021448Claude Sonnet 5.5
LMArena Vision: diagrams1329Not measuredOnly Claude Sonnet 5.5 measured
LMArena Vision: homework1331Not measuredOnly Claude Sonnet 5.5 measured
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Sonnet 5.5 and Inkling
BenchmarkClaude Sonnet 5.5InklingLeader
OTIS Mock AIME100.0%88.9%Claude Sonnet 5.5
FrontierMath, tiers 1 to 388.8%33.3%Claude Sonnet 5.5
FrontierMath, tier 480.5%4.9%Claude Sonnet 5.5
ProofBench100.0%0.0%Claude Sonnet 5.5
LMArena Text: math14971479Claude Sonnet 5.5
LMArena Text: mathematical work15101460Claude Sonnet 5.5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index60
Knowledge benchmarks for Claude Sonnet 5.5 and Inkling
BenchmarkClaude Sonnet 5.5InklingLeader
MMLU ProNot measured86.3%Only Inkling measured
LegalBench (Vals AI)Not measured83.0%Only Inkling measured
CorpFin (Vals AI)Not measured68.6%Only Inkling measured
TaxEval (Vals AI)Not measured75.3%Only Inkling measured
MortgageTax (Vals AI)Not measured64.0%Only Inkling measured
MedCode (Vals AI)52.9%41.2%Claude Sonnet 5.5
SimpleQA Verified46.5%40.3%Claude Sonnet 5.5
LMArena Text: science14831455Claude Sonnet 5.5
LMArena Text: medicine and healthcare14641447Claude Sonnet 5.5
LMArena Text: legal and government14831448Claude Sonnet 5.5
LMArena Text: business and finance14681438Claude Sonnet 5.5
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index70
Web design benchmarks for Claude Sonnet 5.5 and Inkling
BenchmarkClaude Sonnet 5.5InklingLeader
Design Arena: websites13261224Claude Sonnet 5.5
Design Arena: UI components13671200Claude Sonnet 5.5
Design Arena: game dev14691166Claude Sonnet 5.5
Design Arena: data viz13891160Claude Sonnet 5.5
Design Arena: 3D14581161Claude Sonnet 5.5
Design Arena: all code categories13641206Claude Sonnet 5.5
Design Arena: SVGNot measured1109Only Inkling measured
Design Arena: ASCII artNot measured1089Only Inkling measured
LiveBench design85.0%58.3%Claude Sonnet 5.5
GeneralLike-for-likePublic boards, shown as published, kept out of the index201
General benchmarks for Claude Sonnet 5.5 and Inkling
BenchmarkClaude Sonnet 5.5InklingLeader
Vals Index70.8%29.0%Claude Sonnet 5.5
LiveBench data analysis59.5%72.8%Inkling
Public Benefits Bench (Vals AI)67.2%58.5%Claude Sonnet 5.5
SAGE (Vals AI)51.8%36.5%Claude Sonnet 5.5
MedScribe (Vals AI)91.1%85.4%Claude Sonnet 5.5
Vals Multimodal IndexNot measured49.4%Only Inkling measured
Long context reasoning (AA-LCR)82.7%77.3%Claude Sonnet 5.5
DTBench97.3%87.5%Claude Sonnet 5.5
LMCA68.3%37.6%Claude Sonnet 5.5
Furniture assembly75.0%Not measuredOnly Claude Sonnet 5.5 measured
LMArena Text14731442Claude Sonnet 5.5
LMArena Text: instruction following14921425Claude Sonnet 5.5
LMArena Text: creative writing14671390Claude Sonnet 5.5
LMArena Vision1287Not measuredOnly Claude Sonnet 5.5 measured
LMArena Text: English14841442Claude Sonnet 5.5
LMArena Text: non-English14561434Claude Sonnet 5.5
LMArena Text: Chinese15351493Claude Sonnet 5.5
LMArena Text: GermanNot measured1445Only Inkling measured
LMArena Text: JapaneseNot measured1429Only Inkling measured
LMArena Text: KoreanNot measured1403Only Inkling measured
LMArena Text: French14991455Claude Sonnet 5.5
LMArena Text: Spanish14511449Claude Sonnet 5.5
LMArena Text: Russian14541430Claude Sonnet 5.5
LMArena Text: PolishNot measured1450Only Inkling measured
LMArena Text: multi-turn14651437Claude Sonnet 5.5
LMArena Text: longer queries14951435Claude Sonnet 5.5
LMArena Text: writing and language14741404Claude Sonnet 5.5
LMArena Text: entertainment and media14611394Claude Sonnet 5.5
LMArena Vision: English1289Not measuredOnly Claude Sonnet 5.5 measured
LMArena Vision: reading text1297Not measuredOnly Claude Sonnet 5.5 measured
LMArena Vision: creative writing1242Not measuredOnly Claude Sonnet 5.5 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 Claude Sonnet 5.5 and Inkling
BenchmarkClaude Sonnet 5.5InklingLeader
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 Sonnet 5.5$0.0070Fits in one request
Inkling$0.0030Fits in one request

Inkling costs less

Repository review

50K input + 3K output tokens

Claude Sonnet 5.5$0.130Fits in one request
Inkling$0.062Fits in one request

Inkling costs less

Agent loop

200K input + 10K output tokens

Claude Sonnet 5.5$0.500Fits in one request
Inkling$0.240Fits in one request

Inkling 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 Sonnet 5.5 and Inkling
SpecificationAnthropic Claude Sonnet 5.5Thinking Machines Inkling
MakerAnthropicThinking Machines
WeightsNo public weights listedOpen weights
ReleasedSeptember 28, 2026July 17, 2026
Context window1M524K
Input $/Mtok$2.00$1.00
Output $/Mtok$10.00$4.05
Coding index88.949.7
Independent measurements behind it22
Cost per solved taskNot computable$0.76
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Sonnet 5.5 better than Inkling for coding?

Pick Claude Sonnet 5.5 for coding: it scores 88.9 on the Vibe Coding Index against 49.7 for Inkling. Pick Inkling when output tokens cost 2.5x less, or when what matters is CyberBench (Vals AI) or LiveBench data analysis, where it leads.

Which is cheaper, Claude Sonnet 5.5 or Inkling?

Claude Sonnet 5.5 costs $2.00 per million input tokens and $10.00 per million output tokens; Inkling costs $1.00 and $4.05. Cost per solved task is known for Inkling only.

Which has the bigger context window, Claude Sonnet 5.5 or Inkling?

Claude Sonnet 5.5, with 1M tokens against 524K.

How many benchmarks is the Claude Sonnet 5.5 vs Inkling comparison based on?

77 benchmarks have a result for both models as of October 21, 2026. Claude Sonnet 5.5's coding index rests on 2 independent benchmarks and Inkling's on 2. Where only one model has a result, the page says so instead of naming a winner.

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<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/claude-sonnet-5-5-vs-thinkingmachines-inkling">LLMBenchmark.ai, Claude Sonnet 5.5 vs Inkling</a></p>