Added

• batch: make OpenAI interface extend Batch interface (#433).
• responses: add Responses API support (create, retrieve, cancel, delete, and input_items listing).
• chat: add web_search_options request support.
• chat: expose annotations and reasoning_content in chat message payloads.
• chat: support required tool choice mode (#429).

Fixed

• chat: make ChatCompletionRequestBuilder.reasoningEffort, store, and maxCompletionTokens configurable.
• chat: improve ChatResponseFormat compatibility by supporting both primitive and object variants.
• chat: always encode JsonSchema.strict, including its default true value (#430).
• chat: set explicit JSON class discriminator for polymorphic ContentPart serialization.
• images: stabilize image edit uploads for live API compatibility (#459).
• tests: remove flaky external image URL dependency from chat vision live tests.
• tests: stabilize vector store live tests with current API behavior (#459).

Changed

• tests: make openai-client live API tests opt-in via OPENAI_LIVE_TESTS=1.
• ci: split billable live tests into a small JVM smoke job and a separate full-live workflow.
• docs: fix RetrievalTool usage in Getting Started guide (#427).