ASUS Zenfone 12 Ultra vs OnePlus 15

ASUS Zenfone 12 Ultra

Snapdragon 8 Elite delivers class-leading performance — described as "the fastest phone I used in 2025" by Android Central. The clean, near-stock Android 15 experience with no bloatware makes it one of the most fluid Android phones available. On-device Meta Llama 3 AI processing is private but slow.

• "The fastest phone I used in 2025" — Snapdragon 8 Elite with the best-tuned software on Android
• Clean near-stock Android 15 with zero bloatware — extremely fluid and well-optimized
• On-device Meta Llama 3 AI is privacy-friendly but slow — often faster to just do the task manually
• Aggressive thermal throttling under sustained loads — GPU benchmark scores lower than expected

OnePlus 15

The Snapdragon 8 Elite Gen 2 paired with up to 16GB RAM delivers the fastest Android performance available, with excellent thermal management maintaining sustained speeds.

• Snapdragon 8 Elite Gen 2 delivers top-of-class benchmark scores with Geekbench multi-core exceeding 10,000 — the fastest Android phone tested
• Thermal management is excellent — sustained gaming performance remains high even after extended sessions, with minimal throttling
• 16GB RAM ensures app retention is excellent — you can return to apps hours later and find them exactly where you left them

ASUS Zenfone 12 Ultra

The standout is the 6-axis Hybrid Gimbal Stabilizer 4.0 which delivers uniquely impressive video stabilization — a 66% improvement over the predecessor. The 50MP main camera is solid in good light, but HDR processing produces visible ghosting artifacts, dynamic range suffers with crushed shadows and clipped highlights, and the overall camera system doesn't compete at this price tier.

• 6-axis Hybrid Gimbal Stabilizer is uniquely excellent for video — best-in-class stabilization
• HDR processing leaves visible ghosting artifacts in photos — a shocking flaw for a 2025 flagship
• Dynamic range issues: shadows frequently crushed, highlights clipped, colors washed out and cold
• "Better than midrange but not flagship level" — not competitive with Galaxy S25 Ultra or Pixel 9 Pro

OnePlus 15

The Hasselblad-tuned triple camera system delivers natural colors and excellent portraits, with a 50MP main, 50MP ultrawide, and 50MP 3x periscope telephoto.

• Hasselblad color science produces warm, natural tones that look true to life — portraits are particularly impressive with excellent skin tone rendering and bokeh
• The 3x periscope telephoto delivers sharp, detailed shots and the 50MP sensor means cropping to 6x still produces usable results
• In challenging mixed-lighting conditions, HDR processing can occasionally produce artifacts and inconsistent exposure between the three lenses
• Video recording at 4K60 is excellent with effective stabilization, though Dolby Vision HDR video still trails iPhone in dynamic range