Is Kling O3 or LTX-2.5 on Sume? Read the catalog before you plan

Whether a new model is on Sume is answered by one call, GET /v1/video-router/models, not by a blog post. The catalog this post was written against lists kling-3 (Kling Video v3 Pro), wan-3.0, seedance-2.5, two MiniMax rows, gemini-omni-flash-1.1, grok-imagine-video-1.5, h3-max-recast and, when its provider is configured, a motion-transfer row. It lists no Kling O3 and no LTX model id. Re-run the call before you build around any name.

A vendor changelog proves a model exists, and a catalog proves a route does.

Check by id

This Python call prints every id the catalog returns and flags the names you care about. It uses only the documented catalog endpoint.

import os
import requests

r = requests.get(
    "https://api.sume.com/v1/video-router/models",
    headers={"Authorization": f"Bearer {os.environ['SUME_API_KEY']}"},
    timeout=30,
)
r.raise_for_status()
ids = [row["id"] for row in r.json()["data"]["models"]]
print(ids)
for want in ("kling-o3", "ltx-2.5", "wan-3.0"):
    print(want, want in ids)

What the vendor pages show

Runway's changelog (2026-09-18) lists Kling O3 4K, Kling 3.0 Standard, Kling O3 Standard and Kling 3.0 Motion Control as available on Runway MCP. That page says what Runway offers. They do not say what Sume exposes.

What to do when it is not listed

You have three honest choices. Use the route the vendor offers, pick the closest catalog row and test it, or ask for the model through your usual support channel. Do not guess an id: an unknown model returns an error, and a similar-looking id may be a different product.

• Same model family, different resolution: compare the row's capabilities.resolutions.
• Same job, different model: use Video Router Auto with sume/auto and accept that Sume does not disclose which family ran.
• Pinned model required: stay on the vendor until the id appears.

Where the facts are

The catalog contract is on the Video Router page, and the response fields are in Video generation. Vendor claims are on Runway's changelog and Kling's developer page for the vendor's own model list.