v4.0.0

4.0.0 (2025-09-30)

Full Changelog: v3.7.1...v4.0.0

⚠ BREAKING CHANGES

• api: ResponseFunctionToolCallOutputItem.output and ResponseCustomToolCallOutput.output now return string | Array<ResponseInputText | ResponseInputImage | ResponseInputFile> instead of string only. This may break existing callsites that assume output is always a string.

Features

• api: Support images and files for function call outputs in responses, BatchUsage (de7a6c1)

Bug Fixes

• client: remove duplicate outputAsJson function (4718871)