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Canonical AI event

GPT-5.1-Mini model constants removed in v4.66.0 API update.

The gpt-5.1-mini model constants were removed from several API types in v4.66.0.

22 Sept 20261 verified claims1 sources1 observations
What happened

The official source reports this update: v4.66.0. 4.66.0 (2026-09-21) ⚠ BREAKING CHANGES api: Removed the unsupported gpt-5.1-mini model's GPT_5_1_MINI constants and corresponding Known / Value enum cases from ChatModel , BetaResponse.Model , BetaResponsesClientEvent.ResponseCreate.Model , beta ResponseCreateParams.Model , and both beta and stable ResponseCompactParams.Model types. Code referencing any of these members must select an available model and be recompiled. This removal is covered by the SDK's minor-version compatibility exception.

Why it matters

This official update documents a development concerning v4.66.0. Its practical significance depends on the scope and evidence stated by the source.

What to watch next

Read the official source update and verify its stated scope, evidence and timing before acting on it.

Connected knowledge

Entities affected by this event

Openai Javasubject
Continue this topic
agents-softwareNew API features added in version 4.67.0.22 Sept 2026agents-softwareLegacy gpt-5.1-mini identifiers restored in API with 4.66.122 Sept 2026agents-softwareNew API features added in version 4.65.0.18 Sept 2026agents-softwareVersion 4.64.0 adds compaction progress events to the API.17 Sept 2026agents-softwareJava formatter lint mode corrected in version 4.63.316 Sept 2026agents-softwareGraalVM setup-graalvm dependency updated to 1.6.6 in v4.63.215 Sept 2026
Evidence trail

Sources behind the event

OpenAI Java SDK releasesv4.66.0
Editorial presentation

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