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GLM 5.3 is Z.ai's full-size long-context chat model behind an OpenAI-compatible call. It reads up to 1,048,576 tokens, replies up to 131,072, with reasoning effort up to max, 128 tool schemas per request and JSON output.

Input $1.05Output $3.30per 1 million tokens25% below the publisher's list priceCached input $0.195Z.ai official priceInput $1.40Output $4.40