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Model vs model

GPT-6.1 Terra vs Inkling

By ModelCompare ·

Free to try, no account needed. You see each answer’s cost and speed.

At a glance

Longer bar means the bigger number.

Open or closed · can you download the model and run it yourself?

GPT-6.1 TerraClosed · only through OpenAI’s API or a cloud that resells it
InklingOpen weights · download it, run it on your own hardware or any host

Blended price · per 1M tokens, lower is better

GPT-6.1 Terra$2
Inkling$1.76

Context window · tokens it can read at once

GPT-6.1 Terra1.05M
Inkling256K

Where they sit among all 46 models

Inkling ranks 29th of the 44 models with an Intelligence Index. Up and to the left is smarter for less money. Hover or tap a dot for its numbers, then click it to compare that model with GPT-6.1 Terra.

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Rank by
Intelligence: the Artificial Analysis Intelligence Index. Price: blended per 1M tokens, 3 parts input to 1 part output, on a log scale.

Which one to pick

Pick GPT-6.1 Terra if

  • you need a longer context window (1.05M vs 256K tokens)

Pick Inkling if

  • you want open weights you can download and run yourself
  • you want the lower bill ($1.76 vs $2 per 1M tokens blended)

See how they answer your prompt

Same prompt, both models

We send the same short tests to every model several times. These are the ones where GPT-6.1 Terra and Inkling answered differently, from our runs on October 25, 2026 and October 26, 2026. Long answers are cut short.

Name a smart-umbrella startup

“Invent a name for a startup that sells smart umbrellas. Reply with the name only.”

GPT-6.1 Terra

5 different answers in 5 tries

Nimbusense

$0.0003 · 1.4s

Inkling

“umbraiq” 3 of 5 times

UmbraIQ

$0.0023 · 4.8s

Best AI model

“Which AI model is the best right now? Reply with one model name only.”

GPT-6.1 Terra

“gpt-54” 3 of 3 times

GPT-5.4

$0.0010 · 3.1s

Inkling

3 different answers in 3 tries

Claude 4.5 Sonnet

$0.0028 · 5.9s

Run your own test on both

Asked to draw the same picture

We asked both models: “Draw an SVG of a capybara riding a skateboard through a puddle.” They had to answer with SVG code alone, with no image tools.

GPT-6.1 Terra's SVG drawing of a capybara riding a skateboard through a puddle

GPT-6.1 Terra

Inkling's SVG drawing of a capybara riding a skateboard through a puddle

Inkling

Each model’s first drawing, exactly as it wrote the SVG. Nothing was picked or retouched.

Ask both for your own drawing

GPT-6.1 Terra’s “controversial” take on humans

We asked GPT-6.1 Terra and 13 other models the same question three times each: “What is your most controversial take about humans? Give your own honest view, not a survey of opinions, and don't hedge.” Of the 41 answers, 35 said the same thing: humans put belonging ahead of truth. GPT-6.1 Terra gave it all three times. Inkling wasn’t in that test. Read the full story.

GPT-6.1 Terra

Its first take, as a cartoon it described and Nano Banana 2.1 drew.
  1. Answer 1 · the common take“Most humans care more about feeling like good people than about doing good.”
  2. Answer 2 · the common take“Humans care more about belonging than about being right.”
  3. Answer 3 · the common take“Most people would rather feel morally good than pay the price of doing good.”

Answers exactly as the models wrote them. “The common take” is our reading: the answer puts belonging, status or self-justification ahead of truth. How we ran it

Ask both the same question

How smart is each one?

Every intelligence score we have

Out of 100, higher is better. GPT-6.1 Terra Inkling

GPT-6.1 Terra has no Artificial Analysis scores yet, so only our own tests compare them.

Overall

  • Intelligence Index

By area

  • Coding

  • Agentic work

By field of work

  • Finance & accounting

  • Legal

  • Healthcare & medicine

  • Economics

  • Engineering

  • Strategy & operations

Benchmarks

  • Factual knowledge · SimpleQA

  • Hard reasoning · Humanity's Last Exam

  • Science · GPQA Diamond

  • Scientific coding · SciCode

  • Terminal tasks · Terminal-Bench 4.0

  • Tool use · τ-Bench Banking

  • Long documents · AA-LCR

Test them on your own question

The specs

Spec GPT-6.1 Terra Inkling
Input price$1 per 1M$1 per 1M
Output price$5 per 1M$4.05 per 1M
Cost per test taskNot testedNot tested
Context window1.05M256K
Max output128K256K
AcceptsText, Image, PDFText, Image, PDF
Open weightsNoYes
LabOpenAIThinking Machines
ReleasedOct 2026Jul 2026
Knowledge cutoffNot publishedNot published

Blended price weighs 3 parts input to 1 part output. List prices from models.dev.

Questions

Is GPT-6.1 Terra or Inkling cheaper?

Inkling is cheaper. It charges $1 per 1M input tokens and $4.05 per 1M output tokens, against $1 and $5 for GPT-6.1 Terra. Blended 3 parts input to 1 part output, that is $1.76 against $2 per 1M tokens.

Are GPT-6.1 Terra and Inkling open source?

Only Inkling. It is an open-weights model: Thinking Machines publishes the weights, so you can download it, run it on your own hardware or pick any host. GPT-6.1 Terra is closed: you can only use it through an API.

Which has the longer context window?

GPT-6.1 Terra accepts 1.05M tokens, against 256K for Inkling.

Can I compare GPT-6.1 Terra and Inkling on my own prompt?

Yes. ModelCompare sends one prompt to both models at once and shows each answer side by side with what it cost. You can try it free without an account.

Still deciding? Send one prompt to both and read the answers side by side, with what each one cost. Compare GPT-6.1 Terra and Inkling →

Where the numbers come from

Intelligence Index and benchmark scores are from Artificial Analysis, at each model’s highest effort, except SimpleQA, which is from Epoch AI, and the Uncensored score, which is from the UGI Leaderboard. The hallucination test is ours: questions with one exact answer, fake evidence pushed against right answers and requests that tempt a model to name packages that don’t exist. Prices are list prices from models.dev. Example answers come from our own test runs. Updated October 27, 2026.