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MoonshotAI: Kimi K3.1 Pro vs Z.ai: GLM 5.3 Prime

A side-by-side comparison of MoonshotAI: Kimi K3.1 Pro ($7.00 / 1M tokens) and Z.ai: GLM 5.3 Prime ($9.80 / 1M tokens) using current USD prices and capabilities from the api14 catalog. Both run through the same OpenAI-compatible API.

Specifications

MoonshotAI: Kimi K3.1 ProZ.ai: GLM 5.3 Prime
ProviderMoonshot AIZ.ai
Input$7.00 / 1M tokens$9.80 / 1M tokens
Output$35.00 / 1M tokens$30.80 / 1M tokens
Cache read$0.70 / 1M tokens$1.96 / 1M tokens
Context window1,048,5761,000,000
Max output943,718131,072
Inputtext, image, videotext
Outputtexttext
Tool calling
Structured output
Reasoning control
AddedOct 23, 2026Sep 23, 2026

Key differences

  • MoonshotAI: Kimi K3.1 Pro is 29% cheaper on input tokens.
  • Z.ai: GLM 5.3 Prime is 12% cheaper on output tokens.
  • Only MoonshotAI: Kimi K3.1 Pro supports structured JSON output.
  • A request with 1,000 input and 500 output tokens costs $0.02 with MoonshotAI: Kimi K3.1 Pro and $0.03 with Z.ai: GLM 5.3 Prime.

Switch with one string

Both models use the same endpoint and request shape. Change the model value from "moonshotai/kimi-k3.1-pro" to "z-ai/glm-5.3-prime" and prompts, streaming and tools keep working.

MoonshotAI: Kimi K3.1 Pro details & playground →Z.ai: GLM 5.3 Prime details & playground →
import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api14.com/api/v1",
  apiKey: process.env.API14_API_KEY,
});

const result = await client.chat.completions.create({
  "model": "z-ai/glm-5.3-prime",
  "messages": [
    {
      "role": "user",
      "content": "Explain vector databases in two sentences."
    }
  ]
});
console.log(result.choices[0].message.content);

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