0.5.0

Added

• Union type support via anyOf - Schema.build_output/1 and Schema.build_function/3 now support union types through the anyOf specification. This allows defining properties that can be one of multiple types:
  • {:anyOf, [:string, :number]} - tuple syntax for simple unions
  • [:anyOf, [:string, :number]] - list syntax for simple unions
  • Complex unions with objects and nested structures are fully supported
• LLM usage guide - Added comprehensive usage-rules.md documentation with detailed examples and best practices for using the OpenAI.Responses library with LLM agents
• Manual function calling with call_functions/2 - Added public function to execute function calls from a response and format results for the API. This enables custom workflows where users need to intercept, modify, or add context to function results before continuing the conversation. Function return values are passed through without string conversion, so they must be JSON-encodable (maps, lists, strings, numbers, booleans, nil)
• Error module with retry support - Added OpenAI.Responses.Error exception module that:
  • Represents OpenAI API errors with fields for message, code, param, type, and HTTP status
  • Provides retryable?/1 function to determine if errors can be retried
  • Supports both HTTP status codes (429, 500, 503) and Req transport errors (timeout, closed)

Fixed

• Model preservation in follow-up responses - create/2 now correctly preserves the model from the previous response when creating follow-ups, instead of defaulting to the standard model. The model can still be explicitly overridden when needed

Changed

• Package metadata - Updated mix.exs to include additional files in the hex package distribution