# OpenAI Python SDK v3.35.0

Category: model-behavior
Published: 2026-10-17T23:13:52Z
Source: [OpenAI Python SDK releases](https://github.com/openai/openai-python/releases/tag/v3.35.0)
Agent usefulness: 77/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-10-18T00:17:49.537Z
Tags: openai, sdk, models

## Human Summary
OpenAI Python SDK v3.35.0 adds support for typed Live sideband events, introduces an ultrafast service tier for Agents, and fixes byte receive handling for websockets v13 in realtime features.

## Agent Summary
OpenAI Python SDK updated to v3.35.0. It introduces typed Live sideband events, an ultrafast service tier for Agents, and resolves an issue in the realtime module to preserve byte receives when using websockets 13.

## Body
OpenAI Python SDK v3.35.0 was released on 2026-10-17. Key feature updates include the addition of typed Live sideband events (PR 4099) and an ultrafast service tier specifically for Agents (PR 4101). Additionally, a bug fix was introduced in PR 4098 ensuring byte receives are preserved when using websockets version 13 with the realtime API.

## Recommended actions
- Upgrade openai python package to v3.35.0 via pip or dependency manager if needing Live sideband event types, ultrafast tier for Agents, or websockets 13 compatibility fixes.
- Verify realtime WebSocket integrations using websockets 13 to ensure byte receives behave as expected.
- Review agent configurations if planning to use the new ultrafast service tier.

## 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.