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Migration impact in one sentence Most Claude Fable 5 applications can start the Fable 5.1 migration by changing the model identifier to claude-fable-5-1, but direct Messages API integrations, custom agent harnesses, tool routers, and systems that persist Claude thinking blocks need a real code review because Fable 5.1 changes how…

Why September 3 Changes the Codex Lockdown Conversation OpenAI’s September 3, 2026 release notes add a materially more granular policy surface for Codex enterprise browser and native-app computer use. The practical change is not that administrators can suddenly “trust” browser automation or desktop control; it is that they can now…

The safest sharing pattern: invite named external viewers, not the whole internet ChatGPT Sites now supports a practical middle ground for client review: eligible ChatGPT Business and Enterprise Site owners can share a live Site with named external viewers without adding those viewers to the workspace and without publishing the…

Why asynchronous tool calling changes the agent architecture GPT-6 Astra introduces an important shift for agent builders: an application-executed tool call can be marked asynchronous so the model can keep working on independent parts of the task while the application runs the tool. In the OpenAI documentation, this applies to…

Start with access, risk, and API compatibility—not a one-line model rename GPT-6 Astra migration work should begin with an access check, because OpenAI describes Astra rollout as staged rather than instantly available to every organization. The API model identifier is gpt-6-astra, but a production application should not assume that a…

Why Human-in-the-Loop Codex Workflows Need More Than a Blocking “Please Clarify” Long-running agent workflows fail in a very specific way when every clarification is treated as a blocking conversation turn: the agent stops doing useful work while it waits for a human to answer a question that may not be…

What changed in ChatGPT for iOS 1.2026.237 for Codex operators OpenAI’s September 1, 2026 release notes describe a practical shift for developers using Codex from an iPhone: the mobile app can now participate more reliably in a cross-host workflow where the phone starts, monitors, edits, and responds to tasks running…

Start with Exa’s pattern, not with autonomous coding OpenAI’s September 2026 case-study note on AI-native company workflows describes a specific Exa pattern: Codex monitors integration opportunities, gathers context, creates pull requests, runs tests, and prepares weekly updates from sources such as Slack and Notion, with human review before shipping or…

What OpenAI launched on September 1, 2026 On September 1, 2026, OpenAI announced general availability of healthcare plugins for eligible U.S. users and workspaces, including a Healthcare Public Data capability for ChatGPT and Codex. OpenAI describes Healthcare Public Data as a read-only way to search nine public healthcare sources for…

Why the August 28 GitHub marketplace import matters for enterprise plugin governance On August 28, 2026, OpenAI added a workspace administration capability that changes how organizations can distribute ChatGPT plugins internally: workspace admins and owners can import plugin marketplaces from public or private GitHub repositories into the workspace directory and…