Pricing per million tokens, context window, capabilities — pulled from each provider's public docs. All 2 are available via the same AIgateway OpenAI-compatible endpoint; flip the model string to switch.
GPT-5 Mini is the lightweight, low-cost variant of GPT-5, well suited to high-volume coding and reasoning tasks.
GPT-5.1 Chat is the chat-tuned variant of GPT-5.1, optimised for back-and-forth conversation and instruction following.
from openai import OpenAI
client = OpenAI(
base_url="https://api.aigateway.sh/v1",
api_key="sk-aig-...",
)
# GPT-5 Mini
client.chat.completions.create(
model="openai/gpt-5-mini",
messages=[{"role":"user","content":"hello"}],
)
# GPT-5.1 Chat
client.chat.completions.create(
model="openai/gpt-5.1-chat",
messages=[{"role":"user","content":"hello"}],
)