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Canonical AI event

Version 3.15.0 introduces agent session model settings.

The v3.15.0 release includes new API features for agent session settings and audio model choices.

18 Sept 20261 verified claims1 sources1 observations
What happened

The official source reports this update: v3.15.0. 3.15.0 (2026-09-18) Features api: add agent session model settings ( #3882 ) ( 4b15817 ) api: add audio-mini model choices ( #3886 ) ( a6eeb3f ) api: add compaction progress events ( #3866 ) ( 98e1d24 ) api: add managed Responses WebSocket sessions ( #3887 ) ( 3b865af ) api: add prompt-cache prewarming ( #3888 ) ( 8f7cdb8 ) Bug Fixes preserve chat stream moderation results ( #3864 ) ( b77076d ) Chores api: clarify incoming SIP call ID usage ( #3885 ) ( f0457ab ) api: update image request examples ( #3889 ) ( bb79676 ) Documentation realtime: remove nonexistent type imports ( #3869 ) ( 2971aaf )

Why it matters

This official update documents a development concerning v3.15.0. Its practical significance depends on the scope and evidence stated by the source.

What to watch next

Read the official source update and verify its stated scope, evidence and timing before acting on it.

Connected knowledge

Entities affected by this event

Openai Pythonsubject
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Evidence trail

Sources behind the event

OpenAI Python library releasesv3.15.0
Editorial presentation

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