iPhone 16 vs iPhone 15

Performance is rated critical because the processor determines not only raw speed but also which features your phone can run, most notably Apple Intelligence.

The iPhone 16 scores 9/10. Its A18 chip is built on a second-generation 3nm process, delivering roughly 30% faster CPU performance and 40% faster GPU performance compared to the A16 Bionic. More importantly, the A18 has a 16-core Neural Engine that is purpose-built for on-device AI processing. This enables Apple Intelligence features that are simply not possible on older chips. In daily use, apps launch faster, gaming is smoother and the phone handles demanding multitasking with ease. The improved thermal design means the A18 sustains its peak performance for longer.

The iPhone 15 scores 8/10. The A16 Bionic is still an excellent chip that handles everything iOS demands comfortably. Most everyday tasks feel responsive and smooth. However, the A16 Bionic lacks the Neural Engine capability required for Apple Intelligence, which is the key limitation. For gaming, video editing and computational photography, the A18 has a measurable advantage that becomes more apparent under sustained workloads.

Camera quality is rated critical because the camera is the feature most people use every day, and the shooting experience differs meaningfully between these two phones.

The iPhone 16 scores 9/10. While it shares the same 48MP main sensor resolution as the iPhone 15, the Camera Control button transforms how you interact with the camera. A light press previews settings, a full press captures the shot and a slide adjusts zoom, all without touching the screen. The A18 chip also enables improved computational photography with better Smart HDR, more accurate skin tones and faster processing of 48MP images. The 12MP ultrawide camera benefits from improved low-light performance.

The iPhone 15 scores 8/10. Its 48MP main camera produces excellent photos and the computational 2x zoom using the sensor centre is genuinely useful. The camera is still one of the best in its price range. However, without Camera Control, adjusting settings requires on-screen taps, and the A16 Bionic processes photos slightly slower than the A18. In good light, results from both phones are very similar. The gap widens in challenging conditions and when using advanced features.

AI features are rated important because Apple Intelligence represents the most significant software direction Apple has taken in years, and it fundamentally divides these two phones.

The iPhone 16 scores 8/10. Apple Intelligence runs on-device using the A18 chip's Neural Engine. Current features include writing tools that rewrite, proofread and summarise text across any app; photo clean-up that removes unwanted objects from images; notification summaries that condense alerts; a more contextual Siri; and Genmoji for creating custom emoji. Apple continues to expand these capabilities with each iOS update, meaning the iPhone 16 will gain new AI features over time.

The iPhone 15 scores 5/10. It cannot run Apple Intelligence at all. The A16 Bionic lacks the Neural Engine capability that Apple requires for on-device AI processing. This means the iPhone 15 misses out on writing tools, photo clean-up, smart summaries and the improved Siri. As Apple continues to invest heavily in AI, this gap will widen with each iOS release. The iPhone 15 still has basic Siri functionality, but it will not receive the enhanced AI features.

The iPhone 16 scores 8/10. It has a larger 3,561 mAh battery compared to the iPhone 15's 3,349 mAh, a roughly 6% increase. Combined with the A18 chip's improved power efficiency, the iPhone 16 delivers approximately one to two hours more screen-on time in typical daily use. This is particularly noticeable on heavy usage days when you are streaming, gaming or using AI features.

The iPhone 15 scores 7/10. Its 3,349 mAh battery provides solid all-day performance for most users. In typical mixed use, the iPhone 15 comfortably lasts a full day. The difference between the two phones is noticeable but not dramatic. If battery life is adequate on the iPhone 15 for your usage patterns, the iPhone 16's improvement is welcome but not transformative.

The iPhone 16 scores 9/10. Being the newest model, it has the longest runway of both standard iOS updates and Apple Intelligence feature updates. Apple typically supports iPhones for five to six years, meaning the iPhone 16 should receive updates through to at least 2030. Crucially, it will also receive every Apple Intelligence expansion Apple ships, giving it capabilities that grow over time.

The iPhone 15 scores 8/10. It will receive standard iOS updates through to at least 2028 or 2029, which is several years of support ahead. However, it will not receive any Apple Intelligence updates, regardless of how long it continues to receive iOS updates. This creates a two-tier experience where the iPhone 15 gets core iOS features but misses the AI layer that Apple is building on top.

The iPhone 15 scores 9/10 for value. At approximately £699, it is a superb smartphone at a discounted price. You get a 48MP camera, USB-C, a modern OLED display and years of iOS support. For users who do not need Apple Intelligence or the Camera Control button, it represents outstanding value and delivers roughly 90% of the iPhone 16 experience for £100 less.

The iPhone 16 scores 7/10 for value. At £799, the £100 premium buys you Apple Intelligence, Camera Control, Action button, better battery life and a faster chip. Whether that justifies the additional cost depends on how much you value AI features and the improved camera experience. If Apple Intelligence appeals to you, the extra £100 is easy to justify. If it does not, the iPhone 15 is the smarter financial choice.