GPT-5.5 Models Excel in Long-Horizon Agentic Tasks

GPT-5.5 and GPT-5.5 Pro outperform prior generations in token efficiency and handle extended agentic workflows across coding, computer use, knowledge work, and scientific research. GPT-5.5 shines in agentic coding by maintaining context over large systems, propagating codebase changes, and using computer-use skills to manipulate real software—converting raw inputs into documents, spreadsheets, or slides. GPT-5.5 Pro prioritizes response quality for multi-step tasks, delivering gains in business, legal, education, data science, and technical research through iterative critiquing and argument stress-testing.

Integrate Seamlessly via AI SDK

Access models by setting model: 'openai/gpt-5.5' or 'openai/gpt-5.5-pro' in the AI SDK's streamText function. Example for agentic coding:

import { streamText } from 'ai';

const result = streamText({
  model: 'openai/gpt-5.5',
  prompt: `Migrate our user settings page from REST to the new GraphQL schema, update the affected components and tests, and open a PR with a summary of the changes.`,
});

This enables tasks like full migrations with PR creation directly from prompts.

AI Gateway Boosts Reliability and Observability

The gateway unifies model calls with usage/cost tracking, retries, failover, and performance optimizations for uptime exceeding providers. Key features include custom reporting, observability, Bring Your Own Key support, and intelligent routing. Test models in the playground or check leaderboards for benchmarks.