release: 3.15.0 (#3870)

Automated Release PR
---


##
[3.15.0](https://github.com/openai/openai-python/compare/v3.14.1...v3.15.0)
(2026-09-18)


### Features

* **api:** add agent session model settings
([#3882](https://github.com/openai/openai-python/issues/3882))
([4b15817](https://github.com/openai/openai-python/commit/4b1581771ea97c870187f6ddfc3dbc87ff4fa443))
* **api:** add audio-mini model choices
([#3886](https://github.com/openai/openai-python/issues/3886))
([a6eeb3f](https://github.com/openai/openai-python/commit/a6eeb3f5a468ec576d2c911c19ce59c56ac46e43))
* **api:** add compaction progress events
([#3866](https://github.com/openai/openai-python/issues/3866))
([98e1d24](https://github.com/openai/openai-python/commit/98e1d24f4902ab58830adf0e2b6a729a5d5429b1))
* **api:** add managed Responses WebSocket sessions
([#3887](https://github.com/openai/openai-python/issues/3887))
([3b865af](https://github.com/openai/openai-python/commit/3b865af92e8dc65e14ab6d565304fe778bac1eef))
* **api:** add prompt-cache prewarming
([#3888](https://github.com/openai/openai-python/issues/3888))
([8f7cdb8](https://github.com/openai/openai-python/commit/8f7cdb80410434d29daed90895112a39936eb4fe))


### Bug Fixes

* preserve chat stream moderation results
([#3864](https://github.com/openai/openai-python/issues/3864))
([b77076d](https://github.com/openai/openai-python/commit/b77076d23b6f3e34453b0fadd8cd2a001627e365))


### Chores

* **api:** clarify incoming SIP call ID usage
([#3885](https://github.com/openai/openai-python/issues/3885))
([f0457ab](https://github.com/openai/openai-python/commit/f0457aba3403f83e91a369ab55e0e55d5f012372))
* **api:** update image request examples
([#3889](https://github.com/openai/openai-python/issues/3889))
([bb79676](https://github.com/openai/openai-python/commit/bb796764118004f8c9b0b0a46e07e5e55cfe34e4))


### Documentation

* **realtime:** remove nonexistent type imports
([#3869](https://github.com/openai/openai-python/issues/3869))
([2971aaf](https://github.com/openai/openai-python/commit/2971aafce5c1966fc56efd00918b16314063284e))

---
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