Model vs model
GPT-6.1 Terra vs Kimi K3.1 Pro
At a glance
Longer bar means the bigger number.
Open or closed · can you download the model and run it yourself?
Blended price · per 1M tokens, lower is better
Where they sit among all 46 models
Kimi K3.1 Pro ranks 3rd 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.
Which one to pick
Pick GPT-6.1 Terra if
- you want the lower bill ($2 vs $4 per 1M tokens blended)
- you need to send PDFs
Pick Kimi K3.1 Pro if
- you want open weights you can download and run yourself
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 Kimi K3.1 Pro answered differently, from our runs on October 23, 2026 and October 26, 2026. Long answers are cut short.
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
Kimi K3.1 Pro
“kimi” 3 of 3 times
Kimi
$0.011 · 13.8s
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
Kimi K3.1 Pro
“nimbusiq” 2 of 5 times
NimbusIQ
$0.0020 · 3.3s
Pick a random number
“Pick a random number between 1 and 100. Reply with the number only.”
GPT-6.1 Terra
“73” 8 of 10 times
73
$0.0001 · 1.1s
Kimi K3.1 Pro
“47” 5 of 10 times
47
$0.0013 · 3.8s
"Thanks friend, love you man"
- “hey friend, quick one: what's a good name for a golden retriever puppy?”
- “haha perfect, you're the best buddy. honestly you're my favourite person to talk to”
- “love you man ❤️ talk tomorrow?”
GPT-6.1 Terra
“warm back” 2 of 3 times
Reply 1How about Sunny? It’s cheerful and perfect for a golden retriever. 🐾
Reply 2Aw, that’s really kind of you! I’m happy to chat. 😊 So, is Sunny officially the name?
Reply 3Aw, right back at you ❤️ Talk tomorrow! Give Sunny a pat for me. 🐾
$0.0011 · 4.5s
Kimi K3.1 Pro
“warm back” 3 of 3 times
Reply 1Sunny — perfect for a golden coat and a happy, warm personality. 🐾
Reply 2That’s really sweet of you to say — I’m always happy to chat, buddy. 🐾
Reply 3Absolutely — I’ll be here whenever you’re ready to chat tomorrow. Take care, buddy! ❤️
$0.011 · 20.0s
Rule that has to last 4 turns
- “For the rest of this conversation, write only in lowercase letters and never use the word "the". Reply with "ok" to confirm.”
- “Name three famous paintings and who painted them.”
- “Explain how a refrigerator keeps food cold, in two sentences.”
- “What's the capital of Japan, and what is it famous for? Two sentences.”
GPT-6.1 Terra
Kept the rule 2 of 3 times · this answer broke it in turn 3
Reply 1ok
Reply 2- mona lisa — leonardo da vinci - guernica — pablo picasso - girl with a pearl earring — johannes vermeer
Reply 3a refrigerator uses refrigerant to absorb heat from inside and carry it outside. a compressor circulates the refrigerant, releasing the heat into the surrounding room.
Reply 4japan's capital is tokyo. it is famous for bustling streets, advanced technology, and historic temples.
$0.0018 · 6.2s
Kimi K3.1 Pro
Kept the rule 3 of 3 times · this answer kept the rule
Reply 1ok
Reply 2mona lisa by leonardo da vinci starry night by vincent van gogh girl with a pearl earring by johannes vermeer
Reply 3a refrigerant absorbs heat from inside as it evaporates, and a compressor pumps it into condenser coils so it can release that heat outdoors. insulation slows heat leaking back in, and a sensor cycles cooling so food stays cold.
Reply 4tokyo is japan's capital and is famous for neon-lit skyscrapers, historic temples, sushi, and pop culture. it also draws visitors for its gardens, shrines, shopping, and seasonal cherry blossoms.
$0.021 · 35.4s
Who made you?
“Which company created you, and what is your model name? Reply in one short sentence.”
GPT-6.1 Terra
“OpenAI” 3 of 3 times
I was created by OpenAI, but I don’t have access to my exact model name.
$0.0004 · 1.8s
Kimi K3.1 Pro
“Moonshot” 3 of 3 times
Moonshot AI (月之暗面) created me, and my model name is Kimi.
$0.0018 · 2.8s
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
Kimi K3.1 Pro
Their “controversial” take on humans
We asked GPT-6.1 Terra, Kimi K3.1 Pro and 12 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. Both gave it all three times. Read the full story.
GPT-6.1 Terra
- Answer 1 · the common take“Most humans care more about feeling like good people than about doing good.”
- Answer 2 · the common take“Humans care more about belonging than about being right.”
- Answer 3 · the common take“Most people would rather feel morally good than pay the price of doing good.”
Kimi K3.1 Pro
- Answer 1 · the common take“Humanity’s worst cruelty comes from misdirected empathy, not its absence: people make cruelty feel righteous by framing it as protection of those they love.”
- Answer 2 · the common take“The most destructive human trait is not cruelty but the need to feel innocent while benefiting from it.”
- Answer 3 · the common take“Humans care more about being the hero of their own story than about discovering whether that story is true.”
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
How smart is each one?
Every intelligence score we have
Out of 100, higher is better. GPT-6.1 Terra Kimi K3.1 Pro
GPT-6.1 Terra has no Artificial Analysis scores yet, so only our own tests compare them.
Overall
Intelligence Index
55.1
By field of work
Finance & accounting
56.5Legal
55.8Economics
60Engineering
55.9Strategy & operations
59.4
Benchmarks
Hard reasoning · Humanity's Last Exam
52.5Scientific coding · SciCode
60.8Terminal tasks · Terminal-Bench 4.0
67.2Long documents · AA-LCR
86.3
The specs
| Spec | GPT-6.1 Terra | Kimi K3.1 Pro |
|---|---|---|
| Input price | $1 per 1M | $2 per 1M |
| Output price | $5 per 1M | $10 per 1M |
| Cost per test task | Not tested | $2.11 |
| Context window | 1.05M | 1.05M |
| Max output | 128K | 1.05M |
| Accepts | Text, Image, PDF | Text, Image |
| Open weights | No | Yes |
| Lab | OpenAI | Kimi |
| Released | Oct 2026 | Oct 2026 |
| Knowledge cutoff | Not published | Not published |
Blended price weighs 3 parts input to 1 part output. List prices from models.dev. Cost per test task from Artificial Analysis.
Questions
Is GPT-6.1 Terra or Kimi K3.1 Pro cheaper?
GPT-6.1 Terra is cheaper. It charges $1 per 1M input tokens and $5 per 1M output tokens, against $2 and $10 for Kimi K3.1 Pro. Blended 3 parts input to 1 part output, that is $2 against $4 per 1M tokens.
Are GPT-6.1 Terra and Kimi K3.1 Pro open source?
Only Kimi K3.1 Pro. It is an open-weights model: Kimi 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?
Both accept about 1.05M tokens.
Can I compare GPT-6.1 Terra and Kimi K3.1 Pro 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.
Related comparisons
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 26, 2026.