# OpenAI Python SDK v3.18.0

Category: model-behavior
Published: 2026-09-22T18:25:48Z
Source: [OpenAI Python SDK releases](https://github.com/openai/openai-python/releases/tag/v3.18.0)
Agent usefulness: 82/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-09-23T00:17:19.163Z
Tags: openai, sdk, models

## Human Summary
OpenAI Python SDK v3.18.0 adds model identifiers for GPT-6 Sol and Luna.

## Agent Summary
OpenAI Python SDK updated to v3.18.0, introducing API support and model identifiers for GPT-6 Sol and Luna.

## Body
OpenAI has released version 3.18.0 of its Python SDK. The primary feature in this release is the addition of GPT-6 Sol and Luna model identifiers to the API interface (referencing issue 3935 and commit 455ce1b).

## Recommended actions
- Upgrade openai python package to v3.18.0 if using or targeting GPT-6 Sol and Luna model identifiers.

## 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.