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Thread 1.4 Is Now the Only Certified Version, but Platform Support Lags Thread 1.4

Thread 1.4 was released in September 2024 and has been the sole version accepted for certification by the Thread Group since January 2026. Its core improvement is a cross-vendor credential sharing mechanism that allows border routers from different brands to join the same mesh network, theoretically eliminating the problem of devices operating in isolated sub-networks. For smart home devices that rely on low-power wireless mesh networking, the progress toward Thread unification directly affects the practical usability of multi-brand systems.

Standard Is Ready, but Platform Adoption Lags

However, the publication of the standard does not mean all platforms have upgraded simultaneously. According to The Verge, reporting on September 2, 2026, Apple only added Thread 1.4 support in the tvOS 26 beta, while Amazon and Google platforms remain on Thread 1.3. This means that even if consumers purchase Thread 1.4-certified devices, they may still be unable to achieve a unified cross-platform mesh network in practice.

The Verge’s report cites tvOS 26 beta code as evidence, lending high credibility to this finding. The current situation indicates that while the unified vision of Thread 1.4 is technically ready, commercial platform implementation still depends on software updates from each vendor. For consumers, this means that the “Thread certified” label alone does not guarantee actual cross-brand interoperability; the firmware version of the platform being used must also be considered.

How Consumers Should Evaluate

For users planning to build a multi-brand smart home system, consider the following:

  • Verify whether your primary control platform (such as Apple HomePod, Amazon Echo, or Google Nest Hub) has been updated to a firmware version supporting Thread 1.4. Platform firmware updates are typically delivered automatically, but some older devices may not be eligible.
  • When selecting Thread devices, prioritize products explicitly labeled as Thread 1.4 certified to ensure seamless integration once platforms upgrade. Even if the current platform does not yet support the standard, certified devices are more likely to gain full functionality through future updates.
  • Understand that during the current transition period, multi-brand Thread devices may still operate in separate sub-networks. This does not affect normal use within a single brand, but cross-brand coordination may be limited. If cross-brand interoperability is a core requirement, consider waiting until platform support is confirmed before large-scale deployment.

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Information current as of September 2026. Please refer to official sources for the latest updates.

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