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Arcee AI Valued Above $1B After Series B for Open-Weight ModelsYoudao Says AI Competition Is Entering a 'Model + Agent + Workflow' Era as It Shows Agent Products in BeijingAdafruit Releases CircuitPython Turbo for RP2040 and RP2350 BoardsOpenAI Vows More Transparency as AI Models Show New Signs of MisbehaviorXiaomi Live-Streams MiMo-V2.6 RL Training, Burning About $30,000 an HourApple releases first RCs for macOS Tahoe 26.7.1 and macOS Sequoia 15.8.1
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Apple releases first RCs for macOS Tahoe 26.7.1 and macOS Sequoia 15.8.1

Apple has released the first release candidates of macOS Tahoe 26.7.1 and macOS Sequoia 15.8.1 for Mac developers, with release notes citing only important security fixes.

AI News Feed · 2026-09-17 12:07

The release build for macOS Tahoe 26.7.1 RC 1 is 25G309, while the first RC for macOS Sequoia 15.8.1 carries build 24H208. Release notes for both updates mention only the default language: “this update provides important security fixes and is recommended for all users.” Such wording is typical for minor macOS updates.

Earlier today, Apple released the first developer betas of its 27.2 operating systems, skipping the 27.1 beta cycle entirely. According to 9to5Mac, that decision was likely made to avoid leaking additional details about the iPhone Duo. For Mac developers, the 27.2 beta 1 release came alongside the two macOS RCs.

The RCs arrive just days after Apple officially released macOS Tahoe 26.7 and macOS Sequoia 15.8. 9to5Mac reported that the quick cadence reflects Apple’s broader push to accelerate software development and bug fixing with the help of AI-assisted tools. The company has not listed any changes in the two RCs beyond the security-fix language in the release notes.

Editor's Summary

Apple has issued the first release candidates for macOS Tahoe 26.7.1 and macOS Sequoia 15.8.1, with builds 25G309 and 24H208 respectively. The minor updates list only important security fixes, arriving days after the prior macOS releases and alongside macOS 27.2 beta 1. Apple’s decision to skip a 27.1 beta cycle was seen as a way to avoid revealing details about the iPhone Duo.