GPT 5.4 Nano

OpenAI

Smallest GPT 5.4 variant for classification, routing, and quick replies.

openai/gpt-5.4-nano

Conversation

Start a conversation

Smallest GPT 5.4 variant for classification, routing, and quick replies.

Enter to send · Shift+Enter for a new line

Prompt

System prompt

User prompt prefix

Prepended to every user message sent to the API.

Append previous messagesWhen off, only the system prompt and latest user message are sent.

Output

Max tokens

Stream responseShow tokens as they arrive

Tools

Tools (JSON)

Tool choice

Uses POST /v1/chat/completions with your Unifically API key. Supports system and user prompts, tools, streaming, and thinking when available.