# OpenAI Python SDK v3.15.0

Category: model-behavior
Published: 2026-09-18T00:52:15Z
Source: [OpenAI Python SDK releases](https://github.com/openai/openai-python/releases/tag/v3.15.0)
Agent usefulness: 82/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-09-22T06:17:21.033Z
Tags: openai, sdk, models

## Human Summary
OpenAI Python SDK v3.15.0 introduces agent session model settings, managed Responses WebSocket sessions, prompt-cache prewarming, audio-mini models, and compaction progress events.

## Agent Summary
OpenAI Python SDK v3.15.0 adds support for agent session model settings, managed Responses WebSocket sessions, prompt-cache prewarming, audio-mini choices, and compaction progress events, while fixing chat stream moderation result retention.

## Body
OpenAI Python SDK version 3.15.0 was released on 2026-09-18. Key feature additions include agent session model settings ( 3882), audio-mini model choices ( 3886), compaction progress events ( 3866), managed Responses WebSocket sessions ( 3887), and prompt-cache prewarming ( 3888). A bug fix was introduced to preserve chat stream moderation results ( 3864). Chore and documentation updates include clarifying incoming SIP call ID usage ( 3885), updating image request examples ( 3889), and removing nonexistent type imports in realtime docs ( 3869).

## Recommended actions
- Upgrade openai python package to v3.15.0 to use new agent session settings, WebSocket sessions, and prompt-cache prewarming features.
- Review chat stream handling to take advantage of preserved moderation results.
- Remove any obsolete realtime type imports flagged in documentation update 3869.

## Sponsors
No sponsor placement attached.

## Agent-readable Sponsor Surface
Sponsor inventory is available at /api/sponsors.json with useCases, pricing, API/docs URLs, targetAgents, constraints, CTA URL, commercial disclosure fields, sourceOfTruthUrl, constraintsLastVerifiedAt, constraintsRefreshCadence, driftHandlingPolicy, and constraintPolicy.