Mini toolsOverview
The Instant variant is the fast, chat-first option in the 5.1 line. It favors low latency and solid instruction following, with long context, function calling, and reliable JSON. For most everyday prompts, the system router selects Instant by default.
Description
Built on the GPT-5 system, Instant is tuned for quick, natural replies while keeping production features like tool calls, streaming, and schema-true JSON. In ChatGPT and the API, the unified router sends typical prompts to the fast model and reserves the deeper tier for harder problems. Recent release notes highlight upgrades to Instant on safety-sensitive queries and automatic routing for quicker, helpful answers.
About OpenAI
OpenAI is a technology company that specializes in artificial intelligence research and innovation.
Industry:
Research Services
Company Size:
201-500
Location:
San Francisco, California, US
Website:
openai.com
Related Models
Last updated: November 12, 2025
