feat: Provider Extension - OpenRouter

[Editquest]

Goal

• Support OpenRouter as a remote provider
• Available OR models should show up in Hub

Original User Request

• I have searched the existing issues

Current behavior

Is there a way to get it show the list of model's available and be able to pick one?

{
"sources": [
{
"url": "https://openrouter.ai"
}
],
"id": "open-router-auto",
"object": "model",
"name": "OpenRouter",
"version": "1.0",
"description": " OpenRouter scouts for the lowest prices and best latencies/throughputs across dozens of providers, and lets you choose how to prioritize them.",
"format": "api",
"settings": {},
"parameters": {
"max_tokens": 1024,
"temperature": 0.7,
"top_p": 0.95,
"frequency_penalty": 0,
"presence_penalty": 0
},
"metadata": {
"author": "OpenRouter",
"tags": [
"General",
"Big Context Length"
]
},
"engine": "openrouter"
}

Minimum reproduction step

its on Auto

Expected behavior

Auto

Screenshots / Logs

{
"sources": [
{
"url": "https://openrouter.ai"
}
],
"id": "open-router-auto",
"object": "model",
"name": "OpenRouter",
"version": "1.0",
"description": " OpenRouter scouts for the lowest prices and best latencies/throughputs across dozens of providers, and lets you choose how to prioritize them.",
"format": "api",
"settings": {},
"parameters": {
"max_tokens": 1024,
"temperature": 0.7,
"top_p": 0.95,
"frequency_penalty": 0,
"presence_penalty": 0
},
"metadata": {
"author": "OpenRouter",
"tags": [
"General",
"Big Context Length"
]
},
"engine": "openrouter"
}

Would switching to work:
import requests
import json

response = requests.post(
url="https://openrouter.ai/api/v1/chat/completions",
headers={
"Authorization": f"Bearer {OPENROUTER_API_KEY}",
"HTTP-Referer": f"{YOUR_SITE_URL}", # Optional, for including your app on openrouter.ai rankings.
"X-Title": f"{YOUR_APP_NAME}", # Optional. Shows in rankings on openrouter.ai.
},
data=json.dumps({
"model": "openai/gpt-3.5-turbo", # Optional
"messages": [
{ "role": "user", "content": "What is the meaning of life?" }
]

})
)

Jan version

Jan v0.5.2

In which operating systems have you tested?

• macOS
• Windows
• Linux

Environment details

N/A

[Van-QA]

We introduced a new field to input the model, please check it out via Jan nightly
https://github.com/janhq/jan?tab=readme-ov-file#download
Feel free to get back to us if any issue

[Van-QA]

Reopen this to cover the openrouter models selection

[bogorad]

please allow for multiple, comma-separated model names!

[0xSage]

related #3505

[dan-homebrew]

Closing in favor of #3786