ZMIME
Comparison · 2 models · Updated Oct 4, 2026

Kimi K3 vs GPT-5.4

Too close to call on our weighted score (Kimi K3 65, GPT-5.4 65). The right pick depends on what you value most.

  1. Moonshot AI

    Kimi K3

    Released Jul 16, 2026

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

  2. OpenAI

    GPT-5.4

    Released Mar 5, 2026

    65/100
    • ECI156.9
    • Price$2.50 / $15.00
    • Context1.05M
    Full specs Remove GPT-5.4

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Too close to call

It is close. Our weighted score puts them within a point (Kimi K3 65/100, GPT-5.4 65/100), so choose by what matters most for your work: Kimi K3 for raw capability and GPT-5.4 on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityKimi K3Capabilities Index (ECI): Kimi K3 157.6 · GPT-5.4 156.9
  • Lowest priceGPT-5.4GPT-5.4 $5.63 · Kimi K3 $6.00 per 1M tokens (3:1 blend)
  • Longest contextAbout the sameGPT-5.4 1,050,000 · Kimi K3 1,048,576 tokens
  • Widest inputsSame inputsKimi K3: Text, Images, Video · GPT-5.4: Text, Images, PDFs
  • Self-hostingKimi K3Publishes downloadable weights
How the score is built
MeasureWeightKimi K3GPT-5.4
CapabilityCapabilities Index (ECI)50%8887
Price25%1314
Inputs & features15%8080
Context window10%6161
Overall100%65/10065/100
02 — Side by side

Every spec in one table

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

Kimi K3 vs GPT-5.4 specifications side by side
SpecificationKimi K3Moonshot AIGPT-5.4OpenAI
Capability
Capabilities Index (ECI)157.6 (best)156.9
ECI rank#13 of 148 (best)#16 of 148
GPQA DiamondGraduate-level science questions93.1%93.3% (best)
FrontierMath Tiers 1–3Research-level mathematics72.2%78.6% (best)
OTIS Mock AIME 2024–2025Competition mathematics97.2%97.8% (best)
SWE-bench VerifiedFixing real GitHub issues—76.9%
SimpleQA VerifiedShort factual questions50.6% (best)45.1%
Price per million tokens
Input$3.00$2.50 (best)
Output$15.00$15.00
Cached input$0.30$0.25 (best)
Blended (3:1)$6.00$5.63 (best)
Long-context rateSame rateOver 272K: $5.00 / $22.50
Price sourceOfficial Moonshot AI APIOfficial OpenAI API
Limits
Context window1,048,576 tokens1,050,000 tokens (best)
Max output131,072 tokens (best)128,000 tokens
Inputs and features
TextYesYes
ImagesYesYes
PDFsNoYes
AudioNoNo
VideoYesNo
ReasoningYeslow · high · maxYeslow · medium · high · xhigh
Tool callingYesYes
Structured outputYesYes
Availability
WeightsOpenProprietary
API model IDkimi-k3gpt-5.4
API providers68 (best)36
ReleasedJul 16, 2026Mar 5, 2026
Knowledge cutoff—Aug 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.

  • Kimi K3$60.00
  • GPT-5.4$55.00
04 — Questions

Which should you choose?

Which is better: Kimi K3 or GPT-5.4?

It is close. Our weighted score puts them within a point (Kimi K3 65/100, GPT-5.4 65/100), so choose by what matters most for your work: Kimi K3 for raw capability and GPT-5.4 on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, Kimi K3 or GPT-5.4?

GPT-5.4 is cheaper at $2.50 input / $15.00 output per million tokens (official OpenAI API price). Kimi K3 costs $3.00 input / $15.00 output per million tokens (official Moonshot AI API price). At a typical mix of three input tokens to one output token, that is $5.63 per million tokens for GPT-5.4 versus $6.00 for Kimi K3 (1.1× 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-5.4 156.9 (#16 of 148). The confidence ranges of the top two overlap (154.9–160.4 vs 154.9–159.1), so treat the gap as small. On individual benchmarks: GPQA Diamond — GPT-5.4 93.3%, Kimi K3 93.1%; FrontierMath Tiers 1–3 — GPT-5.4 78.6%, Kimi K3 72.2%; OTIS Mock AIME 2024–2025 — GPT-5.4 97.8%, Kimi K3 97.2%; SimpleQA Verified — Kimi K3 50.6%, GPT-5.4 45.1%.

Which is better for coding?

There are no published SWE-bench Verified results for 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?

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

Which can read images, PDFs, audio or video?

Kimi K3 accepts text, images and video; GPT-5.4 accepts text, images and PDFs. They handle the same number of input types.

Are any of these open source?

Kimi K3 publishes its weights and can be self-hosted; GPT-5.4 is proprietary.

Which is newer?

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