Claude has announced the suspension of access to its Fable 5 model following restrictions imposed by the U.S. government. Effective immediately, new sessions will default to either the user's configured default model or Opus 4.8, while existing Fable 5 sessions will terminate with an error. API requests to Fable 5 on the Claude Platform will also result in errors. Developers are urged to swiftly transition their applications and integrations to alternative Claude models to ensure continuity. This move underscores the impact of regulatory measures on AI model accessibility and the need for developers to adapt promptly.