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GLM-5.3 Prime and GLM-5.3-FlashX

Two more GLM 5.3 tiers from Z.ai: Prime, the top reasoning tier ($2.80 / $8.80 list), and FlashX, the high-speed cut ($0.37 / $1.25 list). Both 1M context, BYOK.

The GLM 5.3 line gets two more tiers next to z-ai/glm-5.3 and z-ai/glm-5.3-flash.

  • z-ai/glm-5.3-prime — the top reasoning tier, above Flash and FlashX. 1M-token context, function calling.
  • z-ai/glm-5.3-flashx — the high-speed variant for coding agents, real-time interaction and long-running agent workflows. 1M-token context, up to 131k output, image and video input.
ModelInput / 1M (list)Output / 1M (list)BYOK via
GLM 5.3 Prime$2.80$8.80OpenRouter
GLM-5.3-FlashX$0.37$1.25AIHubMix

Add the key under Dashboard → BYOK; the request goes out with your key and the provider bills you at its own rates. AnyRouter charges nothing for a BYOK route.

Try it in the Vercel AI SDK (guide). createAnyRouter() reads ANYROUTER_API_KEY:

import { createAnyRouter } from "@anyr/ai-sdk-provider"
import { generateText } from "ai"

const anyrouter = createAnyRouter()

const { text } = await generateText({
  model: anyrouter("z-ai/glm-5.3-flashx"),
  prompt: "Write a test for this function.",
})
console.log(text)
generateText with the catalog id.

Already on the OpenAI SDK? OpenAI SDK playbook:

OpenAI-compatible: SDK or curl.
import OpenAI from "openai"

const client = new OpenAI({
  baseURL: "https://anyrouter.dev/api/v1",
  apiKey: process.env.ANYROUTER_API_KEY,
})

const res = await client.chat.completions.create({
  model: "z-ai/glm-5.3-flashx",
  messages: [{ role: "user", content: "Hello" }],
})
console.log(res.choices[0]?.message.content)
curl https://anyrouter.dev/api/v1/chat/completions \
  -H "Authorization: Bearer $ANYROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"z-ai/glm-5.3-flashx","messages":[{"role":"user","content":"Hello"}]}'

Or launch a coding agent through the anyr CLI (Claude Code · OpenCode):

Coding agents via the AnyRouter CLI.
curl -fsSL https://anyrouter.dev/setup.sh | bash
anyr login
anyr claude --model "z-ai/glm-5.3-flashx"
curl -fsSL https://anyrouter.dev/setup.sh | bash
anyr login
anyr opencode --model "z-ai/glm-5.3-flashx"
curl -fsSL https://anyrouter.dev/setup.sh | bash
anyr login
anyr codex --model "z-ai/glm-5.3-flashx"

More: AI SDK · OpenAI SDK · coding agents · BYOK setup.

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