v0.28.0

0.28.0 (2025-09-30)

Full Changelog: v0.27.1...v0.28.0

⚠ 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 (904348a)

Bug Fixes

• coroutine leaks from connection pool (7f0b3cd)