Cheap GLM 5.3 API

What a top-up buys on GLM 5.3

Output-token count only; input tokens are cheaper. First top-up is at least 2.5×.

When to pick GLM 5.3

GLM 5.3 costs $0.0043 per 1,500-in/500-out request at list price, $0.0022 effective. It sits in the mid price range — a good default for production apps.

GLM 5.3 vs similarly priced models

Nearest models to GLM 5.3 by blended price (3 input : 1 output). All run on one Somnus key.

Getting the most out of GLM 5.3 for less

• Input is 3.1× cheaper than output on GLM 5.3, so long context with short answers is the cheapest pattern.
• A $200 top-up gives $500 credit — about 233M blended GLM 5.3 tokens.
• Mix models: send easy steps to DeepSeek V4 Flash and keep GLM 5.3 for the steps that need it.

Use GLM 5.3

import OpenAI from "openai";

const client = new OpenAI({
  apiKey: process.env.SOMNUS_API_KEY,
  baseURL: "https://gateway-production-c837.up.railway.app/v1",
});

const resp = await client.chat.completions.create({
  model: "claude-sonnet-5",
  messages: [
    {"role": "user", "content": "Summarise this in one line"}
  ],
});
console.log(resp.choices[0].message.content);

Copy the exact model id from your dashboard.

Questions

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