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GPT-6.1 Terra vs Inkling

GPT-6.1 Terra leads Inkling on coding, 77.4 to 31.6 on the Vibe Coding Index, and Inkling costs 1.2x less per output token ($4.05 vs $5.00 per million). Updated October 29, 2026; 32 benchmarks have a result for both.

Replace GPT-6.1 Terra Replace Inkling
GPT-6.1 TerraOpenAI
Coding
77.4
Overall
76.8
Output $/M
$5.00
29
T InklingThinking Machines
Coding
31.6
Overall
43.5
Output $/M
$4.05
3
vs boards won of 32 shared

GPT-6.1 Terra or Inkling: which to pick

Pick GPT-6.1 Terra for coding: it scores 77.4 on the Vibe Coding Index against 31.6 for Inkling, though on 4 benchmarks against 6.

Pick Inkling for output tokens 1.2x cheaper ($4.05 vs $5.00 per million) and work measured by Tax Agent Bench (Vals AI) or Legal Research Bench (Vals AI), where it leads.

Model AGPT-6.1 TerraOpenAI77.4/1004 independent benchmarksNo cost per solved taskModel BInklingThinking Machines31.6/1006 independent benchmarks$0.76 per solved task
Shared results
32
GPT-6.1 Terra only
4
Inkling only
73
Like-for-like categories
8 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

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-6.1 Terra 77.4 from 4 benchmarks, Inkling 31.6 from 6 benchmarks.
Widest category
Math, 52.2 points apart on average over 3 shared benchmarks.
Widest single gap
FrontierMath, tier 4: GPT-6.1 Terra 92.7% against Inkling 4.9%, 87.8 points apart on a 0 to 100 scale.
Output price
GPT-6.1 Terra $5.00 against Inkling $4.05 per million output tokens, 1.2x apart.
Context window
GPT-6.1 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-6.1 TerraBarsInklingTies
Coding80
Intelligence10
Agentic work43
Reasoning40
Math30
Knowledge10
Web design50
General30
All shared boards293
CodingLike-for-likeSix of these boards feed the Vibe Coding Index80
Coding benchmarks for GPT-6.1 Terra and Inkling
BenchmarkGPT-6.1 TerraInklingLeader
LiveBench coding94.3%64.0%GPT-6.1 Terra
LMArena WebDev16731415GPT-6.1 Terra
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)49.5%0.5%GPT-6.1 Terra
Vibe Code Bench (Vals AI)84.0%19.2%GPT-6.1 Terra
Code migration (Vals AI)Not measured11.8%Only Inkling measured
ProgramBench (Vals AI)Not measured0.0%Only Inkling measured
IOI (Vals AI)Not measured14.9%Only Inkling measured
Terminal-Bench 2.1 (Vals AI)Not measured47.6%Only Inkling 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)Not measured66.8%Only Inkling measured
SciCode55.1%47.0%GPT-6.1 Terra
FrontierCodeNot measured14.0%Only Inkling measured
FrontierSWENot measured4.1%Only Inkling measured
WeirdMLNot measured32.3%Only Inkling measured
ALE-Bench2608.8946.0GPT-6.1 Terra
LMArena Text: codingNot measured1466Only Inkling measured
LMArena Text: software and ITNot measured1466Only Inkling measured
LMArena WebDev: React16571405GPT-6.1 Terra
LMArena WebDev: HTML17191402GPT-6.1 Terra
SWE-Bench Pro V2Not measured89.9%Only Inkling measured
Neither model has a result on the other 19 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for GPT-6.1 Terra and Inkling
BenchmarkGPT-6.1 TerraInklingLeader
AA Intelligence Index51.012.5GPT-6.1 Terra
Epoch Capabilities IndexNot measured148.4Only Inkling measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index43
Agentic work benchmarks for GPT-6.1 Terra and Inkling
BenchmarkGPT-6.1 TerraInklingLeader
AA Agentic IndexNot measured22.5Only Inkling measured
Design Arena: agents building web appsNot measured1197Only Inkling measured
LiveBench research73.9%59.9%GPT-6.1 Terra
LiveBench browser93.1%12.0%GPT-6.1 Terra
LiveBench long agentic48.6%8.5%GPT-6.1 Terra
SREBench (Vals AI)Not measured0.0%Only Inkling measured
Finance Agent (Vals AI)Not measured46.6%Only Inkling measured
Tax Agent Bench (Vals AI)15.2%15.3%Inkling
Legal Research Bench (Vals AI)26.0%28.4%Inkling
Harvey's Legal Agent Benchmark (Vals AI)1.7%3.8%Inkling
Excel Modeling Benchmark (Vals AI)Not measured38.4%Only Inkling measured
APEX-Agents68.3%33.8%GPT-6.1 Terra
MCP AtlasNot measured76.0%Only Inkling measured
Neither model has a result on the other 29 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index40
Reasoning benchmarks for GPT-6.1 Terra and Inkling
BenchmarkGPT-6.1 TerraInklingLeader
GPQA DiamondNot measured87.1%Only Inkling measured
LiveBench reasoning88.7%78.3%GPT-6.1 Terra
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)46.2%31.9%GPT-6.1 Terra
GPQA Diamond (Epoch AI run)94.3%88.3%GPT-6.1 Terra
ARC-AGINot measured79.5%Only Inkling measured
ARC-AGI-2Not measured36.5%Only Inkling measured
SimpleBenchNot measured50.0%Only Inkling measured
Chess puzzlesNot measured21.0%Only Inkling measured
Mystery game puzzles74.0%Not measuredOnly GPT-6.1 Terra measured
EBR-bench78.1%Not measuredOnly GPT-6.1 Terra measured
LMArena Text: hard promptsNot measured1452Only Inkling measured
LMArena Text: expertNot measured1466Only Inkling measured
LMArena Text: hard prompts in EnglishNot measured1448Only Inkling measured
Humanity's Last Exam (Scale run)35.7%11.2%GPT-6.1 Terra
Neither model has a result on the other 7 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index30
Math benchmarks for GPT-6.1 Terra and Inkling
BenchmarkGPT-6.1 TerraInklingLeader
OTIS Mock AIME100.0%88.9%GPT-6.1 Terra
FrontierMath, tiers 1 to 390.9%33.3%GPT-6.1 Terra
FrontierMath, tier 492.7%4.9%GPT-6.1 Terra
ProofBenchNot measured0.0%Only Inkling measured
LMArena Text: mathNot measured1481Only Inkling measured
LMArena Text: mathematical workNot measured1462Only Inkling measured
Neither model has a result on the other 8 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index10
Knowledge benchmarks for GPT-6.1 Terra and Inkling
BenchmarkGPT-6.1 TerraInklingLeader
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)Not measured41.2%Only Inkling measured
SimpleQA Verified57.3%40.3%GPT-6.1 Terra
LMArena Text: scienceNot measured1456Only Inkling measured
LMArena Text: medicine and healthcareNot measured1449Only Inkling measured
LMArena Text: legal and governmentNot measured1447Only Inkling measured
LMArena Text: business and financeNot measured1439Only Inkling measured
Neither model has a result on the other 9 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index50
Web design benchmarks for GPT-6.1 Terra and Inkling
BenchmarkGPT-6.1 TerraInklingLeader
Design Arena: websites12831224GPT-6.1 Terra
Design Arena: UI components12771197GPT-6.1 Terra
Design Arena: game dev13481165GPT-6.1 Terra
Design Arena: data vizNot measured1158Only Inkling measured
Design Arena: 3DNot measured1157Only Inkling measured
Design Arena: all code categories12951205GPT-6.1 Terra
Design Arena: SVGNot measured1105Only Inkling measured
Design Arena: ASCII artNot measured1086Only Inkling measured
LiveBench design82.3%58.3%GPT-6.1 Terra
GeneralLike-for-likePublic boards, shown as published, kept out of the index30
General benchmarks for GPT-6.1 Terra and Inkling
BenchmarkGPT-6.1 TerraInklingLeader
Vals Index60.5%29.0%GPT-6.1 Terra
LiveBench data analysis82.3%72.8%GPT-6.1 Terra
Public Benefits Bench (Vals AI)Not measured58.5%Only Inkling measured
MedScribe (Vals AI)Not measured85.4%Only Inkling measured
Vals Multimodal IndexNot measured49.4%Only Inkling measured
Long context reasoning (AA-LCR)82.7%77.3%GPT-6.1 Terra
DTBenchNot measured87.5%Only Inkling measured
LMCANot measured37.6%Only Inkling measured
Furniture assembly79.2%Not measuredOnly GPT-6.1 Terra measured
LMArena TextNot measured1443Only Inkling measured
LMArena Text: instruction followingNot measured1426Only Inkling measured
LMArena Text: creative writingNot measured1392Only Inkling measured
LMArena Text: EnglishNot measured1442Only Inkling measured
LMArena Text: non-EnglishNot measured1435Only Inkling measured
LMArena Text: ChineseNot measured1493Only Inkling measured
LMArena Text: GermanNot measured1441Only Inkling measured
LMArena Text: JapaneseNot measured1431Only Inkling measured
LMArena Text: KoreanNot measured1408Only Inkling measured
LMArena Text: FrenchNot measured1461Only Inkling measured
LMArena Text: SpanishNot measured1450Only Inkling measured
LMArena Text: RussianNot measured1434Only Inkling measured
LMArena Text: PolishNot measured1452Only Inkling measured
LMArena Text: multi-turnNot measured1439Only Inkling measured
LMArena Text: longer queriesNot measured1436Only Inkling measured
LMArena Text: writing and languageNot measured1407Only Inkling measured
LMArena Text: entertainment and mediaNot measured1396Only Inkling measured
MultiChallenge74.2%Not measuredOnly GPT-6.1 Terra measured
EQ-Bench 4Not measured1212Only Inkling measured
Neither model has a result on the other 20 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-6.1 Terra and Inkling
BenchmarkGPT-6.1 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-6.1 Terra$0.0035Fits in one request
Inkling$0.0030Fits in one request

Inkling costs less

Repository review

50K input + 3K output tokens

GPT-6.1 Terra$0.065Fits in one request
Inkling$0.062Fits in one request

Inkling costs less

Agent loop

200K input + 10K output tokens

GPT-6.1 Terra$0.250Fits 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-6.1 Terra and Inkling
SpecificationOpenAI GPT-6.1 TerraThinking Machines Inkling
MakerOpenAIThinking Machines
WeightsNo public weights listedOpen weights
ReleasedOctober 26, 2026July 17, 2026
Context window1.05M524K
Input $/Mtok$1.00$1.00
Output $/Mtok$5.00$4.05
Coding index77.431.6
Independent measurements behind it46
Cost per solved taskNot computable$0.76
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-6.1 Terra better than Inkling for coding?

Pick GPT-6.1 Terra for coding: it scores 77.4 on the Vibe Coding Index against 31.6 for Inkling, though on 4 benchmarks against 6. Pick Inkling for output tokens 1.2x cheaper ($4.05 vs $5.00 per million) and work measured by Tax Agent Bench (Vals AI) or Legal Research Bench (Vals AI), where it leads.

Which is cheaper, GPT-6.1 Terra or Inkling?

GPT-6.1 Terra costs $1.00 per million input tokens and $5.00 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, GPT-6.1 Terra or Inkling?

GPT-6.1 Terra, with 1.05M tokens against 524K.

How many benchmarks is the GPT-6.1 Terra vs Inkling comparison based on?

32 benchmarks have a result for both models as of October 29, 2026. GPT-6.1 Terra's coding index rests on 4 independent benchmarks and Inkling's on 6. 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-6-1-terra-vs-thinkingmachines-inkling" title="GPT-6.1 Terra 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-6-1-terra-vs-thinkingmachines-inkling">LLMBenchmark.ai, GPT-6.1 Terra vs Inkling</a></p>