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Comparison · 2 models · Updated Oct 4, 2026

GPT-5.4 Pro vs Kimi K3

Kimi K3 comes out ahead, 65 to 60 on our weighted score, and it is the cheaper option too.

  1. OpenAI

    GPT-5.4 Pro

    Released Mar 5, 2026

    60/100
    • ECI159.1
    • Price$30.00 / $180.00
    • Context1.05M
    Full specs Remove GPT-5.4 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-5.4 Pro (60). It leads on price and inputs & features. GPT-5.4 Pro wins on capability. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityGPT-5.4 ProCapabilities Index (ECI): GPT-5.4 Pro 159.1 · Kimi K3 157.6
  • Lowest priceKimi K3Kimi K3 $6.00 · GPT-5.4 Pro $67.50 per 1M tokens (3:1 blend)
  • Longest contextAbout the sameGPT-5.4 Pro 1,050,000 · Kimi K3 1,048,576 tokens
  • Widest inputsKimi K3GPT-5.4 Pro: Text, Images · Kimi K3: Text, Images, Video
  • Self-hostingKimi K3Publishes downloadable weights
How the score is built
MeasureWeightGPT-5.4 ProKimi K3
CapabilityCapabilities Index (ECI)50%9088
Price25%013
Inputs & features15%6080
Context window10%6161
Overall100%60/10065/100
02 — Side by side

Every spec in one table

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

GPT-5.4 Pro vs Kimi K3 specifications side by side
SpecificationGPT-5.4 ProOpenAIKimi K3Moonshot AI
Capability
Capabilities Index (ECI)159.1 (best)157.6
ECI rank#11 of 148 (best)#13 of 148
GPQA DiamondGraduate-level science questions94.6% (best)93.1%
FrontierMath Tiers 1–3Research-level mathematics82.5% (best)72.2%
OTIS Mock AIME 2024–2025Competition mathematics—97.2%
SimpleQA VerifiedShort factual questions46.3%50.6% (best)
Price per million tokens
Input$30.00$3.00 (best)
Output$180.00$15.00 (best)
Cached input—$0.30
Blended (3:1)$67.50$6.00 (best)
Long-context rateOver 272K: $60.00 / $270.00Same rate
Price sourceOfficial OpenAI APIOfficial Moonshot AI API
Limits
Context window1,050,000 tokens (best)1,048,576 tokens
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-5.4-prokimi-k3
API providers1668 (best)
ReleasedMar 5, 2026Jul 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-5.4 Pro$660.00
  • Kimi K3$60.00
04 — Questions

Which should you choose?

Which is better: GPT-5.4 Pro or Kimi K3?

Kimi K3 is the better all-round choice, scoring 65/100 against GPT-5.4 Pro (60). It leads on price and inputs & features. GPT-5.4 Pro wins on capability. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, GPT-5.4 Pro or Kimi K3?

Kimi K3 is cheaper at $3.00 input / $15.00 output per million tokens (official Moonshot AI API price). GPT-5.4 Pro costs $30.00 input / $180.00 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 $67.50 for GPT-5.4 Pro (11× as much).

Which scores higher on benchmarks?

GPT-5.4 Pro scores higher on the Capabilities Index (ECI): GPT-5.4 Pro 159.1 (#11 of 148) and Kimi K3 157.6 (#13 of 148). The confidence ranges of the top two overlap (156.5–161.9 vs 154.9–160.4), so treat the gap as small. On individual benchmarks: GPQA Diamond — GPT-5.4 Pro 94.6%, Kimi K3 93.1%; FrontierMath Tiers 1–3 — GPT-5.4 Pro 82.5%, Kimi K3 72.2%; SimpleQA Verified — Kimi K3 50.6%, GPT-5.4 Pro 46.3%.

Which is better for coding?

There are no published SWE-bench Verified results for GPT-5.4 Pro and Kimi K3 yet, so there is no like-for-like coding score. On overall capability, GPT-5.4 Pro 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?

Their context windows are effectively the same size: GPT-5.4 Pro 1,050,000 and Kimi K3 1,048,576 tokens. Maximum output per response: GPT-5.4 Pro up to 128,000, Kimi K3 up to 131,072 tokens.

Which can read images, PDFs, audio or video?

GPT-5.4 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-5.4 Pro is proprietary.

Which is newer?

Kimi K3 is the newest, released Jul 16, 2026. GPT-5.4 Pro came out Mar 5, 2026. Knowledge cutoff: GPT-5.4 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

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