Migration quickstart

• Update the model slug to gpt-4.1.
• Use either the Responses API or Chat Completions API, depending on your integration.
• Remove reasoning-specific parameters; GPT-4.1 is a non-reasoning model.
• Pass tool schemas through the API tools field instead of injecting tool definitions into the prompt.
• Review prompts for literal instruction following, add explicit persistence and tool-use rules where needed, and validate changes with evals.