For over a decade, Siri has sounded pretty much the same no matter what you asked it - same rhythm, same flat delivery, same slightly robotic pauses. With iOS 27, Apple is finally breaking that pattern in a meaningful way, and the change arrived quietly through a developer beta update rather than a big keynote announcement.
Buried inside iOS 27 beta 3 is a small but genuinely interesting upgrade - you can now control how fast Siri talks and how much emotion it puts into its voice. It sounds minor on paper, but it fundamentally changes how the assistant feels to actually talk to.
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What Exactly Changed
Apple rebuilt Siri around newer generative voice technology as part of its broader Apple Intelligence push, and one of the side effects of that rebuild is far more natural sounding speech. Instead of Siri reading text out loud in a fixed tone, the new version can adjust pacing and emotional inflection, similar to how a real person naturally speeds up when excited or slows down when explaining something carefully.
In the earlier developer betas, Apple had already teased this feature with a "Coming Soon" label next to voice controls in settings. With beta 3, those controls were switched on for testers, letting people actually experience the change rather than just see a placeholder.
How the New Sliders Actually Work
Inside the Siri settings, two new sliders appear once the feature is enabled. The first controls speaking pace, letting you slow Siri down to roughly 0.8x speed for clearer, slower delivery, or speed it up to around 2.0x if you prefer quicker responses when you already know what to expect. The second slider adjusts expressivity, shifting Siri's tone anywhere between neutral and more animated, friendly, or enthusiastic delivery styles.
Rather than picking from a short list of fixed personalities, you get a more granular dial you can adjust to match your own preference, whether that means a calmer, slower assistant for accessibility reasons or a livelier, faster one for quick daily tasks.
Not Every iPhone Gets This Feature
This is where things get a little more restrictive - the new expressive Siri voice controls currently only work on iPhones with Apple's A19 Pro chip, meaning the iPhone Air, iPhone 17 Pro, and iPhone 17 Pro Max. Apple has also confirmed the advanced Siri AI features require at least 12GB of RAM, which explains why older devices are left out of this particular upgrade, at least for now.
If you are running an older iPhone, updating to iOS 27 will still bring other general improvements, but this specific voice personalization feature is tied directly to newer hardware capable of running the more demanding on-device AI models involved.
How to Try It Yourself
If you already have a compatible device enrolled in Apple's beta program, turning this on is fairly simple. Open the Settings app, scroll down and tap Siri, then switch on the newer version of the assistant if you have not already done so by selecting "Try the New Siri" instead of sticking with the previous version.
From there, look for the Expressive Voices Preview toggle and switch it on. This reveals a new customization screen where you can preview different accents and voice options, then fine tune both the pace and expressivity sliders until Siri sounds the way you actually want it to.
Why This Matters Beyond Just Sounding Nicer
Apple has framed part of this update around accessibility, and that angle genuinely makes sense. A slower, clearer pace can make a real difference for users who find rapid speech harder to process, while a livelier, faster style might suit someone who just wants quick answers without unnecessary flourish.
There is also a bigger industry context here. Competing AI assistants have been moving in this same direction for a while - being able to adjust tone, warmth, and personality has become an expected feature rather than a novelty, especially as more people use voice assistants for longer, more natural conversations rather than short one-off commands.
What This Says About Where Siri Is Headed
This update is a small piece of a much larger rebuild happening under the hood of Siri, one that Apple has been rolling out gradually rather than all at once. Instead of a single dramatic relaunch, Apple appears to be shipping these generative AI improvements in stages through beta releases, testing reactions before a wider public rollout.
Whether or not this specific slider feature ends up being something most people actually adjust regularly, it signals a clear shift - Siri is no longer being treated as a static, one-size-fits-all voice, but as something Apple expects users to shape around their own preferences going forward.
Final Thoughts
If you own one of the newer, compatible iPhones and do not mind running a beta, this is a genuinely fun feature to try out, if only to hear how differently Siri can sound with a few slider adjustments. For everyone else, it is a preview of where Apple's assistant is clearly heading - more personal, more natural, and increasingly built around letting you decide exactly how you want it to sound, not just what you want it to do.