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GLM-5.3-Flash vs Kimi K3

glm-5.3-flashkimi-k3
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GLM-5.3-Flash costs $0.104676 per 1M input tokens and $0.348919 per 1M output tokens, with a 1M-token context window; Kimi K3 costs $2.093511 per 1M input tokens and $10.467555 per 1M output tokens, with a 1M-token context window.

Side by side

Prices in US dollars; limits and capabilities as published by each model’s provider.

GLM-5.3-Flash and Kimi K3 side by side
SpecGLM-5.3-FlashKimi K3
Input/ 1M tokens$0.104676$2.093511
Output/ 1M tokens$0.348919$10.467555
Cache read/ 1M tokens$0.020935$0.209351
Cache write/ 1M tokens$0$2.093511
Discount30% offList price $0.15 / $0.5030% offList price $3 / $15
Contexttokens1M1M
Max outputtokens128K1M
Input typestext, image, video, filetext, image, video
Output typestexttext
Released2026-08-262026-07-16
Tokens, last 7 daystokens75M—
Endpoints/v1/chat/completions/v1/responses/v1/chat/completions/v1/responses

Same workload

One workload of 1,000,000 input and 200,000 output tokens, priced at each model’s current rates.

GLM-5.3-Flash
$0.1745$0.1047 input + $0.0698 output
Kimi K3
$4.187$2.0935 input + $2.0935 output

For this workload, GLM-5.3-Flash costs $4.0126 less than Kimi K3.

Same code

Only the model field changes.

curl https://api.cheapaimodel.ai/v1/chat/completions \
  -H "Authorization: Bearer $CHEAPAIMODEL_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "glm-5.3-flash",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

When to choose which

Differences in the published specs, then each provider’s own description.

  • GLM-5.3-Flash has the lower input price ($0.104676 vs $2.093511 per 1M tokens).
  • GLM-5.3-Flash has the lower output price ($0.348919 vs $10.467555 per 1M tokens).
  • GLM-5.3-Flash accepts file input; Kimi K3 doesn’t.
  • GLM-5.3-Flash was released more recently (2026-08-26 vs 2026-07-16).
  • Kimi K3 can return more output in one response (1M vs 128K tokens).

About GLM-5.3-Flash

The first natively multimodal model in Z.ai's GLM-5 series, taking text, image, video and file input. Z.ai positions it as stronger than GLM-5.2 at a much lower cost.

About Kimi K3

Moonshot AI's flagship open-weight model, with 2.8 trillion parameters built on Kimi Delta Attention and Attention Residuals. It has native visual understanding and is designed for long-horizon coding, knowledge work and deep reasoning.

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