# OpenAI Python SDK v3.40.0

Category: model-behavior
Published: 2026-10-27T15:37:52Z
Source: [OpenAI Python SDK releases](https://github.com/openai/openai-python/releases/tag/v3.40.0)
Agent usefulness: 77/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-10-27T18:17:49.508Z
Tags: openai, sdk, models

## Human Summary
OpenAI Python SDK v3.40.0 introduces prompt cache breakpoint TTL options, fixes a browser demo dependency in CI, and includes internal code separation and dependency maintenance updates.

## Agent Summary
OpenAI Python SDK updated to v3.40.0. Key functional change is the addition of prompt cache breakpoint TTL configuration options to the API client.

## Body
The OpenAI Python SDK release v3.40.0 adds API support for prompt cache breakpoint TTL options. It also incorporates CI bug fixes regarding explicit browser demo dependencies, generated-code separation and verification updates, and multiple internal development and GitHub Actions dependency bumps.

## Recommended actions
- Upgrade openai-python to v3.40.0 if you need to configure prompt cache breakpoint TTL options.

## 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.