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GPT 5.5 (Fast)

GPT‑5.5 understands what you’re trying to do faster and can carry more of the work itself. It excels at writing and debugging code, researching online, analyzing data, creating documents and spreadsheets, operating software, and moving across tools until a task is finished. Instead of carefully managing every step, you can give GPT‑5.5 a messy, multi-part task and trust it to plan, use tools, check its work, navigate through ambiguity, and keep going. Your use is subject to OpenAI's Terms & Privacy Policies.

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Use with AI GatewayView docs
import { streamText } from 'ai'


const result = streamText({
  model: 'openai/gpt-5.5-fast',
  prompt: 'Why is the sky blue?'
})
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P50 time to first token (TTFT) on live AI Gateway traffic, in milliseconds. View the docs for more info.