---
name: 9router-chat
description: Chat / code generation via 9Router using OpenAI /v1/chat/completions or Anthropic /v1/messages format with streaming + auto-fallback combos. Use when the user wants to ask an LLM, generate code, summarize text, or run prompts through 9Router.
---

# 9Router — Chat

Requires `NINEROUTER_URL` (and `NINEROUTER_KEY` if auth enabled). See main 9router skill for setup.

## Endpoints

- `POST $NINEROUTER_URL/v1/chat/completions` — OpenAI format
- `POST $NINEROUTER_URL/v1/messages` — Anthropic format

## Discover

```bash
curl $NINEROUTER_URL/v1/models | jq '.data[].id'
curl "$NINEROUTER_URL/v1/models/info?id=openai/gpt-4o"
```

Combos (e.g. `vip`, `mycodex`) auto-fallback through multiple providers.

## OpenAI format

```bash
curl -X POST $NINEROUTER_URL/v1/chat/completions \
  -H "Authorization: Bearer *** \
  -H "Content-Type: application/json" \
  -d '{"model":"openai/gpt-5","messages":[{"role":"user","content":"Hi"}],"stream":false}'
```

JS (OpenAI SDK):

```js
import OpenAI from "openai";
const client = new OpenAI({ baseURL: `${process.env.NINEROUTER_URL}/v1`, apiKey: process.env.NINEROUTER_KEY });
const res = await client.chat.completions.create({
  model: "openai/gpt-5",
  messages: [{ role: "user", content: "Hi" }],
  stream: true,
});
for await (const chunk of res) process.stdout.write(chunk.choices[0]?.delta?.content || "");
```

## Anthropic format

```bash
curl -X POST $NINEROUTER_URL/v1/messages \
  -H "Authorization: Bearer *** \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{"model":"cc/claude-opus-4-7","max_tokens":1024,"messages":[{"role":"user","content":"Hi"}]}'
```