ModelCompare

Model vs model

GPT-6.1 Sol vs Kimi K3.1 Pro

Kimi K3.1 Pro is the better pick on both counts: it scores 55.1 on the Artificial Analysis Intelligence Index against 51.8 for GPT-6.1 Sol, and costs $4 per 1M tokens blended against $4. The biggest gap is on Terminal-Bench 4.0 (terminal tasks), where Kimi K3.1 Pro scores 67.2 against 56.1 for GPT-6.1 Sol.

By ModelCompare ·

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At a glance

Longer bar means the bigger number.

Intelligence Index · Artificial Analysis, higher is better

GPT-6.1 Sol51.8
Kimi K3.1 Pro55.1

Where they sit among all 31 models

GPT-6.1 Sol ranks 7th of the 30 models with an Intelligence Index, Kimi K3.1 Pro 3rd. 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 Sol.

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 Sol if

  • you need to send PDFs

Pick Kimi K3.1 Pro if

  • you want the higher overall score (55.1 vs 51.8)
  • you care about Terminal-Bench 4.0 (terminal tasks): 67.2 vs 56.1
  • you care about SciCode (scientific coding): 60.8 vs 54.2
  • you want open weights you can run yourself

See how they answer your prompt

How smart is each one?

Of the 10 scores both models have, Kimi K3.1 Pro is ahead on 7 and GPT-6.1 Sol on 1, and 2 are within a point.

Every intelligence score we have

Out of 100, higher is better. GPT-6.1 Sol Kimi K3.1 Pro

Overall

  • Intelligence Index

By field of work

  • Finance & accounting

  • Legal

  • Healthcare & medicine

    Kimi K3.1 Pro: not scored yet

  • Economics

  • Engineering

  • Strategy & operations

Benchmarks

  • Factual knowledge · SimpleQA

    Kimi K3.1 Pro: not scored yet

  • Hard reasoning · Humanity's Last Exam

  • Scientific coding · SciCode

  • Terminal tasks · Terminal-Bench 4.0

  • Long documents · AA-LCR

  • Uncensored · UGI

    Kimi K3.1 Pro: not scored yet

Our tests

  • Hallucination test · our test, higher means it made up less

    Kimi K3.1 Pro: not scored yet

  • Rule that has to last 4 turns · our test, % of tries passed

    Kimi K3.1 Pro: not scored yet

  • Three bullets, no letter e · our test, % of tries passed

    Kimi K3.1 Pro: not scored yet

Test them on your own question

The specs

Spec GPT-6.1 Sol Kimi K3.1 Pro
Input price$2 per 1M$2 per 1M
Output price$10 per 1M$10 per 1M
Context window1.05M1.05M
Max output128K1.05M
AcceptsText, Image, PDFText, Image
Open weightsNoYes
LabOpenAIKimi
ReleasedSep 2026Oct 2026
Knowledge cutoffApr 2026Not published

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

Questions

Is GPT-6.1 Sol or Kimi K3.1 Pro cheaper?

They cost the same, $4 per 1M tokens blended.

Which is smarter, GPT-6.1 Sol or Kimi K3.1 Pro?

Kimi K3.1 Pro scores higher on the Artificial Analysis Intelligence Index, 55.1 against 51.8 for GPT-6.1 Sol. The biggest differences are on Terminal-Bench 4.0 (56.1 vs 67.2) and SciCode (54.2 vs 60.8).

Which has the longer context window?

Both accept about 1.05M tokens.

Can I compare GPT-6.1 Sol 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.

Still deciding? Send one prompt to both and read the answers side by side, with what each one cost. Compare GPT-6.1 Sol and Kimi K3.1 Pro →

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 23, 2026.