# OpenAI Python SDK v3.19.1

Category: model-behavior
Published: 2026-09-23T19:15:40Z
Source: [OpenAI Python SDK releases](https://github.com/openai/openai-python/releases/tag/v3.19.1)
Agent usefulness: 82/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-09-24T00:17:20.265Z
Tags: openai, sdk, models

## Human Summary
OpenAI Python SDK v3.19.1 fixes chat tool iterable handling and ensures case-insensitive HTTP header merging.

## Agent Summary
OpenAI Python SDK v3.19.1 resolves bug fixes preserving single-pass tool iterables in chat completions and merging HTTP headers case-insensitively, alongside minor chore and documentation updates.

## Body
OpenAI Python SDK version 3.19.1 addresses two key bug fixes: properly preserving single-pass tool iterables within chat calls ( 3770) and case-insensitively merging HTTP headers ( 3486). Additionally, the release clarifies the Chat Completions seed limits in API definitions ( 3945) and updates repository documentation regarding a collaborator-only pull request policy ( 3948).

## Recommended actions
- Upgrade openai python package to v3.19.1 if passing single-pass iterators for tools or relying on case-insensitive custom HTTP header configurations.

## 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.