ZMIME
Comparison · 2 models · Updated Oct 4, 2026

GPT-5.2 Pro vs Kimi K3

Kimi K3 comes out ahead, 65 to 56 on our weighted score, and it is the cheaper option too.

  1. OpenAI

    GPT-5.2 Pro

    Released Dec 11, 2025

    56/100
    • ECI155.4
    • Price$21.00 / $168.00
    • Context400K
    Full specs Remove GPT-5.2 Pro
  2. Our pick

    Moonshot AI

    Kimi K3

    Released Jul 16, 2026

    65/100
    • ECI157.6
    • Price$3.00 / $15.00
    • Context1.05M
    Full specs Remove Kimi K3

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Kimi K3 is our pick

Kimi K3 is the better all-round choice, scoring 65/100 against GPT-5.2 Pro (56). It leads on capability, price, inputs & features and context window. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityKimi K3Capabilities Index (ECI): Kimi K3 157.6 · GPT-5.2 Pro 155.4
  • Lowest priceKimi K3Kimi K3 $6.00 · GPT-5.2 Pro $57.75 per 1M tokens (3:1 blend)
  • Longest contextKimi K3Kimi K3 1,048,576 · GPT-5.2 Pro 400,000 tokens
  • Widest inputsKimi K3GPT-5.2 Pro: Text, Images · Kimi K3: Text, Images, Video
  • Self-hostingKimi K3Publishes downloadable weights
How the score is built
MeasureWeightGPT-5.2 ProKimi K3
CapabilityCapabilities Index (ECI)50%8588
Price25%013
Inputs & features15%6080
Context window10%4461
Overall100%56/10065/100
02 — Side by side

Every spec in one table

Highlighted cells lead their row. Dashes mean the data is not published.

GPT-5.2 Pro vs Kimi K3 specifications side by side
SpecificationGPT-5.2 ProOpenAIKimi K3Moonshot AI
Capability
Capabilities Index (ECI)155.4157.6 (best)
ECI rank#25 of 148#13 of 148 (best)
GPQA DiamondGraduate-level science questions—93.1%
FrontierMath Tiers 1–3Research-level mathematics74.0% (best)72.2%
OTIS Mock AIME 2024–2025Competition mathematics—97.2%
SimpleQA VerifiedShort factual questions—50.6%
Price per million tokens
Input$21.00$3.00 (best)
Output$168.00$15.00 (best)
Cached input—$0.30
Blended (3:1)$57.75$6.00 (best)
Long-context rateSame rateSame rate
Price sourceOfficial OpenAI APIOfficial Moonshot AI API
Limits
Context window400,000 tokens1,048,576 tokens (best)
Max output128,000 tokens131,072 tokens (best)
Inputs and features
TextYesYes
ImagesYesYes
PDFsNoNo
AudioNoNo
VideoNoYes
ReasoningYesmedium · high · xhighYeslow · high · max
Tool callingYesYes
Structured outputNoYes
Availability
WeightsProprietaryOpen
API model IDgpt-5.2-prokimi-k3
API providers868 (best)
ReleasedDec 11, 2025Jul 16, 2026
Knowledge cutoffAug 31, 2025—
03 — Cost

What would a month cost?

Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.

  • GPT-5.2 Pro$546.00
  • Kimi K3$60.00
04 — Questions

Which should you choose?

Which is better: GPT-5.2 Pro or Kimi K3?

Kimi K3 is the better all-round choice, scoring 65/100 against GPT-5.2 Pro (56). It leads on capability, price, inputs & features and context window. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, GPT-5.2 Pro or Kimi K3?

Kimi K3 is cheaper at $3.00 input / $15.00 output per million tokens (official Moonshot AI API price). GPT-5.2 Pro costs $21.00 input / $168.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $6.00 per million tokens for Kimi K3 versus $57.75 for GPT-5.2 Pro (9.6× as much).

Which scores higher on benchmarks?

Kimi K3 scores higher on the Capabilities Index (ECI): Kimi K3 157.6 (#13 of 148) and GPT-5.2 Pro 155.4 (#25 of 148). The confidence ranges of the top two overlap (154.9–160.4 vs 153.0–158.2), so treat the gap as small. On individual benchmarks: FrontierMath Tiers 1–3 — GPT-5.2 Pro 74.0%, Kimi K3 72.2%.

Which is better for coding?

There are no published SWE-bench Verified results for GPT-5.2 Pro and Kimi K3 yet, so there is no like-for-like coding score. On overall capability, Kimi K3 leads, which tends to carry over to coding, but test on your own codebase. Both support tool calling for agent workflows.

Which has the bigger context window?

Kimi K3 has the largest context window at 1,048,576 tokens, against 400,000 for GPT-5.2 Pro. Maximum output per response: GPT-5.2 Pro up to 128,000, Kimi K3 up to 131,072 tokens.

Which can read images, PDFs, audio or video?

GPT-5.2 Pro accepts text and images; Kimi K3 accepts text, images and video. Kimi K3 handles the widest range of inputs.

Are any of these open source?

Kimi K3 publishes its weights and can be self-hosted; GPT-5.2 Pro is proprietary.

Which is newer?

Kimi K3 is the newest, released Jul 16, 2026. GPT-5.2 Pro came out Dec 11, 2025. Knowledge cutoff: GPT-5.2 Pro Aug 31, 2025.

How do you decide the winner?

Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.

05 — Keep comparing

Related comparisons