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GPT 5.5 Pro

GPT 5.5 Pro is the higher-capability tier of the GPT-5.5 family, applying more compute per request for deeper analysis on the hardest tasks while keeping the same modalities and APIs as standard GPT-5.5.

ReasoningTool UseImplicit CachingFile InputWeb SearchVision (Image)
index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'openai/gpt-5.5-pro',
  prompt: 'Why is the sky blue?'
})
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About GPT 5.5 Pro

GPT 5.5 Pro became available on April 24, 2026 on AI Gateway as the higher-capability tier of the GPT-5.5 model family. It applies more compute per request than the standard GPT-5.5, producing deeper analysis and stronger output on the hardest coding, research, and knowledge-work tasks.

The pro tier supports the same modalities and APIs as standard GPT-5.5, including reasoning, tool use, web search, implicit caching, file inputs, and vision. The trade-off is higher list pricing in exchange for additional reasoning depth on tasks where the standard tier's capability ceiling is the binding constraint.

With a context window of 1M tokens and up to 128K tokens output tokens, GPT 5.5 Pro handles long inputs and produces substantial outputs in a single pass. Call it through the AI SDK, the Chat Completions API, or the Responses API. Pricing on this page reflects current rates from each provider routed through AI Gateway; compare $30 input and $180 output token pricing against standard GPT-5.5 when deciding which tier to route each request to.