You can now access OpenAI's latest Codex models, GPT-5.1 Codex Max with Vercel's AI Gateway and no other provider accounts required. Using a process called compaction, GPT-5.1 Codex Max has been trained to operate across multiple context windows and on real-world software engineering tasks. GPT-5.1 Codex Max is faster and more token efficient compared to previous Codex models, optimized for long-running coding tasks, and can maintain context and reasoning over long periods without needing to start new sessions. To use GPT-5.1 Codex Max with the AI SDK , set the model to openai/gpt-5.1-codex-max . import { streamText } from 'ai' ; const result = streamText ( { model : 'openai/gpt-5.1-codex-max' , prompt : ` Write a CLI tool that scans web server logs, counts 5xx errors per endpoint, and prints the ten endpoints with the most errors using only standard libraries.…