Ox Alpha is now GLM-5.3-Flash

The model AnyRouter listed as stealth/ox-alpha is GLM-5.3-Flash. Same routes, new public name, official launch. Call z-ai/glm-5.3-flash. The old id stays for history, ranking, and leaderboard — it is just unlisted from GET /api/v1/models and the /models picker.

GLM-5.3-Flash is a native multimodal model from Z.ai. It is suited for efficient coding and long-horizon agent tasks. Its hybrid sparse and linear attention architecture maintains accurate long-context behavior while reducing compute overhead. 320B-A18B, MIT License, 1M-token context. Z.ai ran the Ox Alpha preview entirely on Chinese AI chips.

Leading capabilities at a highly competitive price. Catalog host routes keep the copied Ox Alpha $0/$0 rates — docs.z.ai publishes Coding Plan points, not a $/1M API list we can copy. Release note.

• Announcement
• Weights (zai-org/GLM-5.3-Flash)
• API docs (wire id glm-5.3-flash)
• Coding Plan · ZCode · Chat · AutoClaw

Point the Vercel AI SDK or OpenAI SDK at AnyRouter. Switch --model from stealth/ox-alpha to z-ai/glm-5.3-flash.

Try it in the Vercel AI SDK. 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-flash"),
  prompt: "Summarize this diff in three bullets.",
})
console.log(text)

Already on the OpenAI SDK? OpenAI SDK playbook:

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-flash",
  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-flash","messages":[{"role":"user","content":"Hello"}]}'

Or launch a coding agent through the anyr CLI:

curl -fsSL https://anyrouter.dev/setup.sh | bash
anyr login
anyr claude --model "z-ai/glm-5.3-flash"

curl -fsSL https://anyrouter.dev/setup.sh | bash
anyr login
anyr opencode --model "z-ai/glm-5.3-flash"

curl -fsSL https://anyrouter.dev/setup.sh | bash
anyr login
anyr codex --model "z-ai/glm-5.3-flash"

More: AI SDK · OpenAI SDK · coding agents.