Choose Instant, Fast, Smart or Genius

ZenithAI gives you tiers, not model names. You pick a tier by its name, and your server takes care of the rest. Think of it like choosing between a scooter, a car and a train: all reach the destination, at different speeds and for different loads.

Tier	Good for	Images	Your functions (tools)
Instant	Quick replies, sorting and tagging, yes or no answers	Yes	No
Fast	Everyday chat, summaries, pulling fields out of text	Yes	No
Smart	Full-quality answers, longer documents, Office files	Yes	Yes
Genius	The hardest work: careful reasoning over long material	Yes	Yes

Instant, Fast and Smart are on every server. Genius is available when it is switched on for your server. Higher tiers give better answers and take longer.

Check what your server offers

Servers can be set up differently, so ask yours before you build:

Python

import os, requests

r = requests.get(os.environ["BASE"] + "/v1/models",
                 headers={"Authorization": "Bearer " + os.environ["API_KEY"]})
r.raise_for_status()
for m in r.json()["data"]:
    caps = m["capabilities"]
    print(m["id"], "| context:", m["context_window"], "| max output:", m["max_output_tokens"],
          "| images:", caps["vision"], "| tools:", caps["tools"])

cURL

curl --fail-with-body "https://dummydomain/v1/models" \
  -H "Authorization: Bearer $API_KEY"

Each tier lists:

• context_window: how much text, in tokens, one request can hold
• max_output_tokens: the longest answer you can ask for
• capabilities: vision (images), tools (function calling), response_format and streaming
• for image tiers, max_images_per_request; for tool tiers, tool_context_window and max_output_tokens_with_tools

Tip

Read these numbers from /v1/models in your code instead of writing them in. That way your app keeps working when your administrator changes the setup.

Reasoning

In the web app, a Reasoning switch lets the model think before answering, on tiers that allow it. It is off by default. The /v1/chat/completions API answers without reasoning.

Common questions

What is the difference between Fast, Smart and Genius?

Fast gives balanced, quick answers for everyday work. Smart gives full-quality answers and can call your functions. Genius is the top tier for the hardest work, such as long documents and careful reasoning. Higher tiers are slower.

Which ZenithAI tiers can read images?

By default every tier accepts images, up to 8 per request and 20 MiB in total. Your administrator can change this, so check the vision capability in GET /v1/models.

Which tiers support function calling?

Smart and Genius. Instant and Fast don't accept tools. GET /v1/models shows tools as true for the tiers on your server that support them.