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Models › z-ai › Z.ai: GLM 5.3 Flash

Z.ai: GLM 5.3 Flash — pricing & benchmarks

By z-ai · Updated 2026-10-06 · Open weights · mitReads imageslong-context / RAGreads images / documentscheap high-volumestep-by-step reasoningopen weights / self-hostable

Z.ai: GLM 5.3 Flash costs $0.15 per 1M input tokens and $0.5 per 1M output tokens, with a 1M context window. It is best suited for long-context / RAG, reads images / documents, cheap high-volume, step-by-step reasoning, open weights / self-hostable, and is available through one OpenAI-compatible Appmo API key.
$0.15Input / 1M
$0.5Output / 1M
1MContext
5.6MHF downloads (30d)
2.7KHF likes
78Buzz (0-100)

What Z.ai: GLM 5.3 Flash is used for

Z.ai: GLM 5.3 Flash is best suited for long-context / RAG, reads images / documents, cheap high-volume, step-by-step reasoning, open weights / self-hostable. Access it through one Appmo API key alongside 458 other models — Appmo's optimizer can route to it automatically when it is the best value for a request. Weights: huggingface.co/zai-org/GLM-5.3-Flash.

What people are saying (last 30 days)

Not enough posts yet to judge community sentiment. 9 Hacker News stories (385 points) · 197 new GitHub repos mentioning it. How we measure this.

Use it via the Appmo API (OpenAI-compatible)

curl https://appmo.com/v1/chat/completions \
  -H "Authorization: Bearer $APPMO_KEY" \
  -d '{"model":"z-ai/glm-5.3-flash","messages":[{"role":"user","content":"Hello"}]}'

FAQ

How much does Z.ai: GLM 5.3 Flash cost?
Z.ai: GLM 5.3 Flash costs $0.15 per 1M input tokens and $0.5 per 1M output tokens ($0.238 blended), as of 2026-10-06. Prices are expected to fall as competition increases.

What is Z.ai: GLM 5.3 Flash best for?
Z.ai: GLM 5.3 Flash is best suited for long-context / RAG, reads images / documents, cheap high-volume, step-by-step reasoning, open weights / self-hostable.

How do I use Z.ai: GLM 5.3 Flash?
Send requests to Appmo's OpenAI-compatible endpoint with model id "z-ai/glm-5.3-flash" and one API key — no separate provider account needed.

Is Z.ai: GLM 5.3 Flash open source?
Yes — its weights are public on Hugging Face (zai-org/GLM-5.3-Flash) under the mit license; check the license terms before commercial use.

Can Z.ai: GLM 5.3 Flash create images?
No. Z.ai: GLM 5.3 Flash can read and understand images, but it only writes text.