Models
GLM 5.3: comparing the APIs that serve it
Answer in brief
What the model is
GLM 5.3 is an open-weight model that takes text as input. Its maker lists a context window of about a million tokens. A sibling, GLM 5.3 Flash, is listed beside it by many of the same hosts at lower prices.
Who serves it and for how much
On 12 Nov 2026, 35 hosts listed GLM 5.3 here. The lowest listed input price was $0.07 per million tokens. The lowest listed output price was $1.40 per million tokens.
The spread between the lowest and highest listing is wide for this model. That is the reason to compare its hosts before you compare it with another model.
What differs between hosts
The window is close to the maker’s figure on the hosts listed. The output limit varies several times over. Precision varies as well, with more than one reduced format among the listings.
Most hosts of this model also list a cached input price. If your requests share a long opening, that figure can matter more than the headline input price.
How to choose an API for it
Start from your workload. For long documents in and short answers out, the input price and the cached input price lead. For long generated output, the output price and the output limit lead.
Shortlist two or three hosts on those figures. Run your own prompts through each. Check that tool calls behave if your application uses them.
Where Runcrate fits
Runcrate serves GLM 5.3 at $0.59 per million input tokens and $2.63 per million output tokens. The model sits behind Runcrate’s one OpenAI-compatible API, so trying it beside another model is a change of name.
Questions and answers
Sources for this entry
- Runcrate: Runcrate’s official site: what the platform is, its OpenAI-compatible API, how it bills and the number of models it serves. Read 12 Nov 2026.
- Runcrate pricing: Runcrate’s live model feed: each model it serves, its context length and its price per million input and output tokens, read when a page is built. Read 12 Nov 2026.
- Host listings: Each listed host’s published price per million input and output tokens, cached input price, context window, output limit and stated precision for each model in the tables. Read 12 Nov 2026.
- Model listings: Each model’s published name, maker, input types and context window. Read 12 Nov 2026.
Checklists are original editorial guidance. Published prices do not establish availability.
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Cite this entry
Compare LLM APIs. “GLM 5.3: comparing the APIs that serve it.” Content reviewed 12 Nov 2026. https://comparellmapis.com/topics/glm-5-3-apis