Models
- Added dedicated guides for using, migrating to, and prompting the following models: GPT-4.1, GPT-5, GPT-5.1, GPT-5.2, GPT-5.3-Codex, GPT-5.4, GPT-5.5, and GPT-5.6.
- Added model-specific prompting guidance and upgrade instructions for GPT-5.6 Sol.
Responses API
- Added Multi-agent guide covering client-side HTTP/WebSocket flows and output handling.
- Added Programmatic Tool Calling guide for configuring tool invocation and resuming after client-owned function calls.
Removed documentation
- Removed the previous general “latest-model” and “prompt guidance” pages (replaced by the model-specific guides above).