# @ai-sdk/openai@4.0.78

Category: agent-infrastructure
Published: 2026-09-26T02:01:41Z
Source: [Vercel AI SDK releases](https://github.com/vercel/ai/releases/tag/%40ai-sdk%2Fopenai%404.0.78)
Agent usefulness: 77/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-09-27T02:17:58.707Z
Tags: vercel, ai-sdk, typescript

## Human Summary
@ai-sdk/openai v4.0.78 introduces support for reasoningEffortUpdate: 'none' for GPT-6 Sol and Luna, alongside validation for supported reasoning efforts.

## Agent Summary
@ai-sdk/openai updated to 4.0.78: Added reasoningEffortUpdate: 'none' for GPT-6 Sol and Luna across request-level options and positioned system messages. Enforced validation that warns/omits unsupported request-level updates and rejects unsupported historical updates.

## Body
In release @ai-sdk/openai@4.0.78 (commit 94d5d6d), support was added for setting reasoningEffortUpdate to 'none' for GPT-6 Sol and Luna models in both request-level options and positioned system messages. The update also includes validation logic that checks effort updates against the model's supported values: unsupported request-level updates trigger a warning and are omitted, while unsupported historical updates are rejected.

## Recommended actions
- Verify compatibility when using reasoningEffortUpdate with GPT-6 Sol and Luna models.
- Ensure reasoning effort updates match the target model's supported efforts to prevent omitted request options or rejected historical updates.

## 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.