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GPT-5.6 Terra 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 Terra Replace Inkling
GPT-5.6 TerraOpenAI
Coding
69.0
Overall
42.1
Output $/M
$12.00
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 Terra for coding: it scores 69.0 on the Vibe Coding Index against 49.7 for Inkling.

Pick Inkling when output tokens cost 3.0x less, or when what matters is Design Arena: agents building web apps or SimpleBench, where it leads.

Model AGPT-5.6 TerraOpenAI69.0/1002 independent benchmarks$0.42 per solved taskModel BInklingThinking Machines49.7/1002 independent benchmarks$0.76 per solved task
Shared results
99
GPT-5.6 Terra only
25
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 Terra 69.0 from 2 benchmarks, Inkling 49.7 from 2 benchmarks.
Widest category
Math, 34.8 points apart on average over 6 shared benchmarks.
Widest single gap
ProofBench: GPT-5.6 Terra 74.0% against Inkling 0.0%, 74.0 points apart on a 0 to 100 scale.
Output price
GPT-5.6 Terra $12.00 against Inkling $4.05 per million output tokens, 3.0x apart.
Context window
GPT-5.6 Terra 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 TerraBarsInklingTies
Coding220
Intelligence20
Agentic work101
Reasoning121
Math51
Knowledge83
Web design81
General232
All shared boards909
CodingLike-for-likeFour of these boards feed the Vibe Coding Index220
Coding benchmarks for GPT-5.6 Terra and Inkling
BenchmarkGPT-5.6 TerraInklingLeader
LiveBench coding86.2%64.0%GPT-5.6 Terra
LMArena WebDev15221414GPT-5.6 Terra
AA Coding Index76.752.1GPT-5.6 Terra
LiveCodeBench (Vals AI)85.9%85.5%GPT-5.6 Terra
SWE-bench Verified (Vals AI)95.4%77.6%GPT-5.6 Terra
Terminal-Bench 4 (Vals AI)22.7%0.5%GPT-5.6 Terra
Vibe Code Bench (Vals AI)74.6%19.2%GPT-5.6 Terra
Code migration (Vals AI)47.8%11.8%GPT-5.6 Terra
ProgramBench (Vals AI)0.5%0.0%GPT-5.6 Terra
IOI (Vals AI)87.6%14.9%GPT-5.6 Terra
Terminal-Bench 2.1 (Vals AI)77.5%47.6%GPT-5.6 Terra
Vibe Code Bench 1-100 (Vals AI)14.8%7.3%GPT-5.6 Terra
SkillsBench (Vals AI)58.9%26.1%GPT-5.6 Terra
CyberBench (Vals AI)72.1%66.8%GPT-5.6 Terra
SciCode55.0%47.0%GPT-5.6 Terra
Terminal-Bench Hard (Artificial Analysis run)62.9%Not measuredOnly GPT-5.6 Terra measured
FrontierCode41.3%14.0%GPT-5.6 Terra
FrontierSWENot measured4.1%Only Inkling measured
WeirdML78.3%32.3%GPT-5.6 Terra
ALE-Bench1951.4946.0GPT-5.6 Terra
LMArena Text: coding14851466GPT-5.6 Terra
LMArena Text: software and IT14821465GPT-5.6 Terra
LMArena WebDev: React15131404GPT-5.6 Terra
LMArena WebDev: HTML15261399GPT-5.6 Terra
LMArena WebDev: from an image1541Not measuredOnly GPT-5.6 Terra 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 GPT-5.6 Terra and Inkling
BenchmarkGPT-5.6 TerraInklingLeader
AA Intelligence Index42.125.0GPT-5.6 Terra
Epoch Capabilities Index160.1148.4GPT-5.6 Terra
Agentic workLike-for-likePublic boards, shown as published, kept out of the index101
Agentic work benchmarks for GPT-5.6 Terra and Inkling
BenchmarkGPT-5.6 TerraInklingLeader
AA Agentic Index43.222.5GPT-5.6 Terra
Design Arena: agents building web apps11201196Inkling
Design Arena: agents building full-stack apps1061Not measuredOnly GPT-5.6 Terra measured
Design Arena: agents building mobile apps1112Not measuredOnly GPT-5.6 Terra measured
Design Arena: agents building Android apps1066Not measuredOnly GPT-5.6 Terra measured
Design Arena: agents building games1082Not measuredOnly GPT-5.6 Terra measured
Design Arena: HTML slides1108Not measuredOnly GPT-5.6 Terra measured
Design Arena: PowerPoint slides1130Not measuredOnly GPT-5.6 Terra measured
LiveBench research60.4%59.9%GPT-5.6 Terra
LiveBench browser84.0%16.0%GPT-5.6 Terra
LiveBench long agentic48.4%14.1%GPT-5.6 Terra
SREBench (Vals AI)9.5%0.0%GPT-5.6 Terra
Finance Agent (Vals AI)54.4%46.6%GPT-5.6 Terra
Tax Agent Bench (Vals AI)30.0%15.3%GPT-5.6 Terra
Legal Research Bench (Vals AI)41.4%28.4%GPT-5.6 Terra
Harvey's Legal Agent Benchmark (Vals AI)Not measured3.8%Only Inkling measured
Excel Modeling Benchmark (Vals AI)66.2%38.4%GPT-5.6 Terra
Terminal-Bench-Science (Vals AI)10.0%Not measuredOnly GPT-5.6 Terra measured
τ²-Bench Telecom86.3%Not measuredOnly GPT-5.6 Terra measured
APEX-Agents58.2%33.8%GPT-5.6 Terra
BALROG53.2%Not measuredOnly GPT-5.6 Terra measured
Vending-Bench 2$7,343Not measuredOnly GPT-5.6 Terra measured
Neither model has a result on the other 17 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index121
Reasoning benchmarks for GPT-5.6 Terra and Inkling
BenchmarkGPT-5.6 TerraInklingLeader
GPQA Diamond90.9%87.1%GPT-5.6 Terra
LiveBench reasoning90.6%78.3%GPT-5.6 Terra
MMMU Pro (Vals AI)86.5%78.5%GPT-5.6 Terra
GPQA Diamond (Artificial Analysis run)92.5%87.2%GPT-5.6 Terra
Humanity's Last Exam (Artificial Analysis run)42.9%31.9%GPT-5.6 Terra
GPQA Diamond (Epoch AI run)93.3%88.3%GPT-5.6 Terra
ARC-AGI96.5%79.5%GPT-5.6 Terra
ARC-AGI-283.9%36.5%GPT-5.6 Terra
SimpleBench48.9%50.0%Inkling
Chess puzzles47.0%21.0%GPT-5.6 Terra
Mystery game puzzles35.0%Not measuredOnly GPT-5.6 Terra measured
LMArena Text: hard prompts14691451GPT-5.6 Terra
LMArena Text: expert14961466GPT-5.6 Terra
LMArena Text: hard prompts in English14651448GPT-5.6 Terra
LMArena Vision: diagrams1295Not measuredOnly GPT-5.6 Terra measured
LMArena Vision: homework1312Not measuredOnly GPT-5.6 Terra measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index51
Math benchmarks for GPT-5.6 Terra and Inkling
BenchmarkGPT-5.6 TerraInklingLeader
OTIS Mock AIME99.7%88.9%GPT-5.6 Terra
FrontierMath, tiers 1 to 386.0%33.3%GPT-5.6 Terra
FrontierMath, tier 470.7%4.9%GPT-5.6 Terra
ProofBench74.0%0.0%GPT-5.6 Terra
LMArena Text: math14651479Inkling
LMArena Text: mathematical work14781460GPT-5.6 Terra
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index83
Knowledge benchmarks for GPT-5.6 Terra and Inkling
BenchmarkGPT-5.6 TerraInklingLeader
MMLU Pro86.7%86.3%GPT-5.6 Terra
LegalBench (Vals AI)85.1%83.0%GPT-5.6 Terra
CorpFin (Vals AI)65.3%68.6%Inkling
TaxEval (Vals AI)76.2%75.3%GPT-5.6 Terra
MortgageTax (Vals AI)67.3%64.0%GPT-5.6 Terra
MedCode (Vals AI)43.4%41.2%GPT-5.6 Terra
SimpleQA Verified43.2%40.3%GPT-5.6 Terra
LMArena Text: science14521455Inkling
LMArena Text: medicine and healthcare14301447Inkling
LMArena Text: legal and government14611448GPT-5.6 Terra
LMArena Text: business and finance14481438GPT-5.6 Terra
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index81
Web design benchmarks for GPT-5.6 Terra and Inkling
BenchmarkGPT-5.6 TerraInklingLeader
Design Arena: websites12691224GPT-5.6 Terra
Design Arena: UI components12591200GPT-5.6 Terra
Design Arena: game dev12301166GPT-5.6 Terra
Design Arena: data viz12401160GPT-5.6 Terra
Design Arena: 3D11351161Inkling
Design Arena: all code categories12411206GPT-5.6 Terra
Design Arena: SVG12201109GPT-5.6 Terra
Design Arena: ASCII art11771089GPT-5.6 Terra
LiveBench design76.0%58.3%GPT-5.6 Terra
GeneralLike-for-likePublic boards, shown as published, kept out of the index232
General benchmarks for GPT-5.6 Terra and Inkling
BenchmarkGPT-5.6 TerraInklingLeader
Vals IndexNot measured29.0%Only Inkling measured
LiveBench data analysis79.3%72.8%GPT-5.6 Terra
Public Benefits Bench (Vals AI)62.4%58.5%GPT-5.6 Terra
SAGE (Vals AI)47.0%36.5%GPT-5.6 Terra
MedScribe (Vals AI)82.9%85.4%Inkling
Vals Multimodal Index65.1%49.4%GPT-5.6 Terra
IFBench71.2%Not measuredOnly GPT-5.6 Terra measured
Long context reasoning (AA-LCR)83.0%77.3%GPT-5.6 Terra
DTBench93.3%87.5%GPT-5.6 Terra
LMCA54.9%37.6%GPT-5.6 Terra
Surface Evolver Bench83.8%Not measuredOnly GPT-5.6 Terra measured
Furniture assembly54.2%Not measuredOnly GPT-5.6 Terra measured
LMArena Text14481442GPT-5.6 Terra
LMArena Text: instruction following14561425GPT-5.6 Terra
LMArena Text: creative writing14131390GPT-5.6 Terra
LMArena Vision1271Not measuredOnly GPT-5.6 Terra measured
LMArena Text: English14491442GPT-5.6 Terra
LMArena Text: non-English14411434GPT-5.6 Terra
LMArena Text: Chinese15141493GPT-5.6 Terra
LMArena Text: German14601445GPT-5.6 Terra
LMArena Text: Japanese14541429GPT-5.6 Terra
LMArena Text: Korean14271403GPT-5.6 Terra
LMArena Text: French14661455GPT-5.6 Terra
LMArena Text: Spanish14511449GPT-5.6 Terra
LMArena Text: Russian14521430GPT-5.6 Terra
LMArena Text: Polish14461450Inkling
LMArena Text: multi-turn14531437GPT-5.6 Terra
LMArena Text: longer queries14541435GPT-5.6 Terra
LMArena Text: writing and language14311404GPT-5.6 Terra
LMArena Text: entertainment and media14181394GPT-5.6 Terra
LMArena Vision: English1272Not measuredOnly GPT-5.6 Terra measured
LMArena Vision: Chinese1337Not measuredOnly GPT-5.6 Terra measured
LMArena Vision: reading text1278Not measuredOnly GPT-5.6 Terra measured
LMArena Vision: humor1236Not measuredOnly GPT-5.6 Terra measured
LMArena Vision: creative writing1248Not measuredOnly GPT-5.6 Terra measured
LMArena Document1472Not measuredOnly GPT-5.6 Terra 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 Terra and Inkling
BenchmarkGPT-5.6 TerraInklingLeader
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 Terra$0.0080Fits in one request
Inkling$0.0030Fits in one request

Inkling costs less

Repository review

50K input + 3K output tokens

GPT-5.6 Terra$0.136Fits in one request
Inkling$0.062Fits in one request

Inkling costs less

Agent loop

200K input + 10K output tokens

GPT-5.6 Terra$0.520Fits 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 Terra and Inkling
SpecificationOpenAI GPT-5.6 TerraThinking Machines Inkling
MakerOpenAIThinking Machines
WeightsNo public weights listedOpen weights
ReleasedJuly 9, 2026July 17, 2026
Context window1.05M524K
Input $/Mtok$2.00$1.00
Output $/Mtok$12.00$4.05
Coding index69.049.7
Independent measurements behind it22
Cost per solved task$0.42$0.76
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.6 Terra better than Inkling for coding?

Pick GPT-5.6 Terra for coding: it scores 69.0 on the Vibe Coding Index against 49.7 for Inkling. Pick Inkling when output tokens cost 3.0x less, or when what matters is Design Arena: agents building web apps or SimpleBench, where it leads.

Which is cheaper, GPT-5.6 Terra or Inkling?

GPT-5.6 Terra costs $2.00 per million input tokens and $12.00 per million output tokens; Inkling costs $1.00 and $4.05. Per solved SWE-bench Verified task, GPT-5.6 Terra costs $0.42 and Inkling $0.76.

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

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

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

99 benchmarks have a result for both models as of October 21, 2026. GPT-5.6 Terra'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/gpt-5-6-terra-vs-thinkingmachines-inkling">LLMBenchmark.ai, GPT-5.6 Terra vs Inkling</a></p>