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GPT-5.6 Sol vs Inkling

Updated October 21, 2026. 99 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace GPT-5.6 Sol Replace Inkling
GPT-5.6 SolOpenAI
Coding
76.7
Overall
47.0
Output $/M
$20.00
90
T InklingThinking Machines
Coding
49.7
Overall
25.0
Output $/M
$4.05
9
vs boards won of 99 shared

Decision reading

Pick GPT-5.6 Sol for coding: it scores 76.7 on the Vibe Coding Index against 49.7 for Inkling.

Pick Inkling when output tokens cost 4.9x less, or when a solved task costs $0.76 against $1.20.

Model AGPT-5.6 SolOpenAI76.7/1002 independent benchmarks$1.20 per solved taskModel BInklingThinking Machines49.7/1002 independent benchmarks$0.76 per solved task
Shared results
99
GPT-5.6 Sol only
37
Inkling only
3
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
GPT-5.6 Sol 76.7 from 2 benchmarks, Inkling 49.7 from 2 benchmarks.
Widest category
Math, 39.1 points apart on average over 6 shared benchmarks.
Widest single gap
ProofBench: GPT-5.6 Sol 83.0% against Inkling 0.0%, 83.0 points apart on a 0 to 100 scale.
Output price
GPT-5.6 Sol $20.00 against Inkling $4.05 per million output tokens, 4.9x apart.
Context window
GPT-5.6 Sol takes 1.05M 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
CategoryGPT-5.6 SolBarsInklingTies
Coding221
Intelligence20
Agentic work91
Reasoning130
Math51
Knowledge74
Web design90
General232
All shared boards909
CodingLike-for-likeFour of these boards feed the Vibe Coding Index221
Coding benchmarks for GPT-5.6 Sol and Inkling
BenchmarkGPT-5.6 SolInklingLeader
LiveBench coding89.7%64.0%GPT-5.6 Sol
LMArena WebDev16161414GPT-5.6 Sol
AA Coding Index77.452.1GPT-5.6 Sol
LiveCodeBench (Vals AI)82.6%85.5%Inkling
SWE-bench Verified (Vals AI)96.2%77.6%GPT-5.6 Sol
Terminal-Bench 4 (Vals AI)37.9%0.5%GPT-5.6 Sol
Vibe Code Bench (Vals AI)80.5%19.2%GPT-5.6 Sol
Code migration (Vals AI)52.9%11.8%GPT-5.6 Sol
ProgramBench (Vals AI)1.5%0.0%GPT-5.6 Sol
IOI (Vals AI)91.2%14.9%GPT-5.6 Sol
Terminal-Bench 2.1 (Vals AI)85.8%47.6%GPT-5.6 Sol
Vibe Code Bench 1-100 (Vals AI)20.0%7.3%GPT-5.6 Sol
SkillsBench (Vals AI)54.1%26.1%GPT-5.6 Sol
CyberBench (Vals AI)76.3%66.8%GPT-5.6 Sol
SciCode57.8%47.0%GPT-5.6 Sol
Terminal-Bench Hard (Artificial Analysis run)65.9%Not measuredOnly GPT-5.6 Sol measured
FrontierCode47.5%14.0%GPT-5.6 Sol
FrontierSWE32.2%4.1%GPT-5.6 Sol
GSO-Bench76.5%Not measuredOnly GPT-5.6 Sol measured
WeirdML88.8%32.3%GPT-5.6 Sol
MirrorCode20.0%Not measuredOnly GPT-5.6 Sol measured
ALE-Bench2176.9946.0GPT-5.6 Sol
LMArena Text: coding14961466GPT-5.6 Sol
LMArena Text: software and IT14891465GPT-5.6 Sol
LMArena WebDev: React16201404GPT-5.6 Sol
LMArena WebDev: HTML16181399GPT-5.6 Sol
LMArena WebDev: from an image1609Not measuredOnly GPT-5.6 Sol measured
Neither model has a result on the other 11 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for GPT-5.6 Sol and Inkling
BenchmarkGPT-5.6 SolInklingLeader
AA Intelligence Index47.025.0GPT-5.6 Sol
Epoch Capabilities Index162.8148.4GPT-5.6 Sol
Agentic workLike-for-likePublic boards, shown as published, kept out of the index91
Agentic work benchmarks for GPT-5.6 Sol and Inkling
BenchmarkGPT-5.6 SolInklingLeader
AA Agentic Index50.222.5GPT-5.6 Sol
Design Arena: agents building web apps12451196GPT-5.6 Sol
Design Arena: agents building full-stack apps1261Not measuredOnly GPT-5.6 Sol measured
Design Arena: agents building mobile apps1249Not measuredOnly GPT-5.6 Sol measured
Design Arena: agents building Android apps1246Not measuredOnly GPT-5.6 Sol measured
Design Arena: agents building Godot games1260Not measuredOnly GPT-5.6 Sol measured
Design Arena: agents building games1267Not measuredOnly GPT-5.6 Sol measured
Design Arena: HTML slides1286Not measuredOnly GPT-5.6 Sol measured
Design Arena: PowerPoint slides1240Not measuredOnly GPT-5.6 Sol measured
LiveBench research54.5%59.9%Inkling
LiveBench browser88.0%16.0%GPT-5.6 Sol
LiveBench long agentic48.5%14.1%GPT-5.6 Sol
SREBench (Vals AI)30.5%0.0%GPT-5.6 Sol
Finance Agent (Vals AI)53.8%46.6%GPT-5.6 Sol
Tax Agent Bench (Vals AI)31.1%15.3%GPT-5.6 Sol
Legal Research Bench (Vals AI)48.1%28.4%GPT-5.6 Sol
Harvey's Legal Agent Benchmark (Vals AI)Not measured3.8%Only Inkling measured
Excel Modeling Benchmark (Vals AI)72.3%38.4%GPT-5.6 Sol
BioMysteryBench (Vals AI)71.1%Not measuredOnly GPT-5.6 Sol measured
Terminal-Bench-Science (Vals AI)20.0%Not measuredOnly GPT-5.6 Sol measured
Vals Science Index41.5%Not measuredOnly GPT-5.6 Sol measured
Time Horizon Index (Vals AI)23.8%Not measuredOnly GPT-5.6 Sol measured
CUA-bench (Vals AI)8.3%Not measuredOnly GPT-5.6 Sol measured
τ²-Bench Telecom85.1%Not measuredOnly GPT-5.6 Sol measured
APEX-AgentsNot measured33.8%Only Inkling measured
OSWorld 2.027.3%Not measuredOnly GPT-5.6 Sol measured
BALROG60.0%Not measuredOnly GPT-5.6 Sol measured
PostTrainBench36.2%Not measuredOnly GPT-5.6 Sol measured
Vending-Bench 2$9,619Not measuredOnly GPT-5.6 Sol measured
LMArena Search1261Not measuredOnly GPT-5.6 Sol measured
Neither model has a result on the other 9 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index130
Reasoning benchmarks for GPT-5.6 Sol and Inkling
BenchmarkGPT-5.6 SolInklingLeader
GPQA Diamond95.2%87.1%GPT-5.6 Sol
LiveBench reasoning91.7%78.3%GPT-5.6 Sol
MysteryMechanism (Vals AI)33.3%Not measuredOnly GPT-5.6 Sol measured
MMMU Pro (Vals AI)88.8%78.5%GPT-5.6 Sol
GPQA Diamond (Artificial Analysis run)94.1%87.2%GPT-5.6 Sol
Humanity's Last Exam (Artificial Analysis run)49.5%31.9%GPT-5.6 Sol
GPQA Diamond (Epoch AI run)93.5%88.3%GPT-5.6 Sol
ARC-AGI97.5%79.5%GPT-5.6 Sol
ARC-AGI-292.5%36.5%GPT-5.6 Sol
SimpleBench64.8%50.0%GPT-5.6 Sol
Chess puzzles59.0%21.0%GPT-5.6 Sol
Mystery game puzzles58.0%Not measuredOnly GPT-5.6 Sol measured
EBR-bench44.8%Not measuredOnly GPT-5.6 Sol measured
LMArena Text: hard prompts14831451GPT-5.6 Sol
LMArena Text: expert15171466GPT-5.6 Sol
LMArena Text: hard prompts in English14771448GPT-5.6 Sol
LMArena Vision: diagrams1305Not measuredOnly GPT-5.6 Sol measured
LMArena Vision: homework1305Not measuredOnly GPT-5.6 Sol measured
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index51
Math benchmarks for GPT-5.6 Sol and Inkling
BenchmarkGPT-5.6 SolInklingLeader
OTIS Mock AIME100.0%88.9%GPT-5.6 Sol
FrontierMath, tiers 1 to 389.1%33.3%GPT-5.6 Sol
FrontierMath, tier 482.9%4.9%GPT-5.6 Sol
ProofBench83.0%0.0%GPT-5.6 Sol
LMArena Text: math14731479Inkling
LMArena Text: mathematical work14961460GPT-5.6 Sol
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index74
Knowledge benchmarks for GPT-5.6 Sol and Inkling
BenchmarkGPT-5.6 SolInklingLeader
MMLU Pro89.1%86.3%GPT-5.6 Sol
LegalBench (Vals AI)87.0%83.0%GPT-5.6 Sol
CorpFin (Vals AI)64.4%68.6%Inkling
TaxEval (Vals AI)74.8%75.3%Inkling
MortgageTax (Vals AI)67.3%64.0%GPT-5.6 Sol
MedCode (Vals AI)44.0%41.2%GPT-5.6 Sol
SimpleQA Verified69.7%40.3%GPT-5.6 Sol
LMArena Text: science14551455Inkling
LMArena Text: medicine and healthcare14311447Inkling
LMArena Text: legal and government14761448GPT-5.6 Sol
LMArena Text: business and finance14571438GPT-5.6 Sol
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index90
Web design benchmarks for GPT-5.6 Sol and Inkling
BenchmarkGPT-5.6 SolInklingLeader
Design Arena: websites13211224GPT-5.6 Sol
Design Arena: UI components13381200GPT-5.6 Sol
Design Arena: game dev13681166GPT-5.6 Sol
Design Arena: data viz13231160GPT-5.6 Sol
Design Arena: 3D13851161GPT-5.6 Sol
Design Arena: all code categories13411206GPT-5.6 Sol
Design Arena: SVG13161109GPT-5.6 Sol
Design Arena: ASCII art13021089GPT-5.6 Sol
LiveBench design81.6%58.3%GPT-5.6 Sol
GeneralLike-for-likePublic boards, shown as published, kept out of the index232
General benchmarks for GPT-5.6 Sol and Inkling
BenchmarkGPT-5.6 SolInklingLeader
Vals IndexNot measured29.0%Only Inkling measured
LiveBench data analysis79.8%72.8%GPT-5.6 Sol
Public Benefits Bench (Vals AI)66.5%58.5%GPT-5.6 Sol
SAGE (Vals AI)52.6%36.5%GPT-5.6 Sol
MedScribe (Vals AI)85.2%85.4%Inkling
Vals Multimodal Index72.6%49.4%GPT-5.6 Sol
IFBench72.7%Not measuredOnly GPT-5.6 Sol measured
Long context reasoning (AA-LCR)84.0%77.3%GPT-5.6 Sol
DTBench95.7%87.5%GPT-5.6 Sol
LMCA58.5%37.6%GPT-5.6 Sol
Surface Evolver Bench93.1%Not measuredOnly GPT-5.6 Sol measured
Furniture assembly56.7%Not measuredOnly GPT-5.6 Sol measured
LMArena Text14571442GPT-5.6 Sol
LMArena Text: instruction following14831425GPT-5.6 Sol
LMArena Text: creative writing14491390GPT-5.6 Sol
LMArena Vision1281Not measuredOnly GPT-5.6 Sol measured
LMArena Text: English14571442GPT-5.6 Sol
LMArena Text: non-English14511434GPT-5.6 Sol
LMArena Text: Chinese15251493GPT-5.6 Sol
LMArena Text: German14761445GPT-5.6 Sol
LMArena Text: Japanese14721429GPT-5.6 Sol
LMArena Text: Korean14421403GPT-5.6 Sol
LMArena Text: French14721455GPT-5.6 Sol
LMArena Text: Spanish14431449Inkling
LMArena Text: Russian14711430GPT-5.6 Sol
LMArena Text: Polish14591450GPT-5.6 Sol
LMArena Text: multi-turn14611437GPT-5.6 Sol
LMArena Text: longer queries14811435GPT-5.6 Sol
LMArena Text: writing and language14621404GPT-5.6 Sol
LMArena Text: entertainment and media14501394GPT-5.6 Sol
LMArena Vision: English1280Not measuredOnly GPT-5.6 Sol measured
LMArena Vision: Chinese1313Not measuredOnly GPT-5.6 Sol measured
LMArena Vision: reading text1290Not measuredOnly GPT-5.6 Sol measured
LMArena Vision: humor1246Not measuredOnly GPT-5.6 Sol measured
LMArena Vision: creative writing1283Not measuredOnly GPT-5.6 Sol measured
LMArena Document1483Not measuredOnly GPT-5.6 Sol measured
Neither model has a result on the other 10 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-5.6 Sol and Inkling
BenchmarkGPT-5.6 SolInklingLeader
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-5.6 Sol$0.014Fits in one request
Inkling$0.0030Fits in one request

Inkling costs less

Repository review

50K input + 3K output tokens

GPT-5.6 Sol$0.260Fits in one request
Inkling$0.062Fits in one request

Inkling costs less

Agent loop

200K input + 10K output tokens

GPT-5.6 Sol$1.00Fits 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 GPT-5.6 Sol and Inkling
SpecificationOpenAI GPT-5.6 SolThinking Machines Inkling
MakerOpenAIThinking Machines
WeightsNo public weights listedOpen weights
ReleasedJuly 9, 2026July 17, 2026
Context window1.05M524K
Input $/Mtok$4.00$1.00
Output $/Mtok$20.00$4.05
Coding index76.749.7
Independent measurements behind it22
Cost per solved task$1.20$0.76
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.6 Sol better than Inkling for coding?

Pick GPT-5.6 Sol for coding: it scores 76.7 on the Vibe Coding Index against 49.7 for Inkling. Pick Inkling when output tokens cost 4.9x less, or when a solved task costs $0.76 against $1.20.

Which is cheaper, GPT-5.6 Sol or Inkling?

GPT-5.6 Sol costs $4.00 per million input tokens and $20.00 per million output tokens; Inkling costs $1.00 and $4.05. Per solved SWE-bench Verified task, GPT-5.6 Sol costs $1.20 and Inkling $0.76.

Which has the bigger context window, GPT-5.6 Sol or Inkling?

GPT-5.6 Sol, with 1.05M tokens against 524K.

How many benchmarks is the GPT-5.6 Sol vs Inkling comparison based on?

99 benchmarks have a result for both models as of October 21, 2026. GPT-5.6 Sol'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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<iframe src="https://llmbenchmark.ai/embed/compare/gpt-5-6-sol-vs-thinkingmachines-inkling" title="GPT-5.6 Sol vs Inkling, LLMBenchmark.ai" width="100%" height="360" style="border:0;max-width:100%" loading="lazy"></iframe>
<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/gpt-5-6-sol-vs-thinkingmachines-inkling">LLMBenchmark.ai, GPT-5.6 Sol vs Inkling</a></p>