Fast mode

Moyi API's OpenAI-compatible endpoints support fast mode (formerly priority processing).

Using fast mode

Add this to a Chat Completions or Responses API request:

"service_tier": "fast"

Python example:

from openai import OpenAI

client = OpenAI(
    api_key="sk-moyiapi-xxxxxx",
    base_url="https://api.moyiapi.com/v1",
)

resp = client.responses.create(
    model="gpt-5.6-sol",
    input="Analyze this requirement for me",
    service_tier="fast",
)
print(resp.output_text)

The older value "service_tier": "priority" still works and has the same effect.

Supported models

All GPT models that support fast mode. gpt-5.6-sol reaches up to 2.5× standard speed with it enabled. Fast mode is billed at 2× the standard price.

API response differences

The service_tier field in the response shows the tier actually used. For GPT-5.6 and earlier models it may still read "priority" with fast mode enabled; that is expected.