You can now access OpenAI's latest Codex models, GPT-5.1 Codex and GPT-5.1 Codex mini with Vercel's AI Gateway and no other provider accounts required. These Codex models are optimized for long-running, agentic coding tasks and are able to maintain context and reasoning over longer sessions without degradation. To use these models with the AI SDK , set the model to openai/gpt-5.1-codex or openai/gpt-5.1-codex-mini : import { streamText } from 'ai' ; const result = streamText ( { model : 'openai/gpt-5.1-codex' , prompt : ` Create a command-line tool that reads a text file, counts word frequencies, and prints the ten most common words with counts. Use standard libraries only. ` } ) ; AI Gateway provides a unified API for calling models, tracking usage and cost, and configuring retries, failover, and performance optimizations for higher-than-provider uptime. It includes built-in observability , Bring Your Own Key support , and intelligent provider routing with automatic retries.…