Developer Reveals iOS 27 Private APIs Enable Third-Party Siri Backend Replacement

A developer has uncovered evidence that Apple’s upcoming iOS 27 will include private APIs allowing third-party developers to replace Siri’s backend with their own AI models, according to a report published on September 13, 2026. This revelation could represent a monumental shift in Apple’s AI strategy, moving away from a walled-garden approach to an open ecosystem where services like ChatGPT, Claude, or Gemini could power Siri’s responses. Apple shares rose 1.71% on the news, as investors view this as a savvy move to accelerate AI integration without bearing the full cost of training massive language models. The discovery suggests that Apple is preparing to transform Siri from a proprietary assistant into a flexible front-end for the best available AI models on the market, potentially redefining the smartphone AI experience. If true, this could be one of the most significant changes to iOS since the App Store launched, opening up the voice assistant to a new era of competition and innovation
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