How large are the files and what encoding settings (kbps) are available? How much larger are the files vs a gopro? Especially with 4k @ 60 fps?

I have tested the Osmo Action 4 against the Hero 11. Unfortunately the Hero 11 is much more limited in frame rates and resolutions. There is no 60fps nor 30fps. You can get 50fps or 25fps. At 50fps 4k 16:9 (closest to your question), a 1min 11 second video on the Hero 11 is 0.99GB @119087kbps. The Osmo Action 4 is 597MB @63022kbps. The bitrate seems to be variable on both. You can't change the bit rate manually but obviously you can via the different frame rate and resolution combinations. At 25fps the Hero 11 is 766MB @107111 kbps versus 383MB @53426 kbps. Whilst the bitrate is double on the Hero 11 the frame rates are significantly more limited. There are more framerate options on the Osmo and they are consistent across resolutions and aspect ratios so its easier to switch. I hope this helps!

Don't laugh because I'm a fool, but is this the latest most up to date model please?

Yes it's the latest model and I recommend it. Fantastic camera love it.

Battery life at 4k 60fps? With good airflow (eg cycling)

This depends on a bunch of things including resolution, frame rate, screen brightness, whether you have the front screen on, having stabilisation on etc. I havent tested the full battery to empty at 4k 60fps but you won't get an hour. I would guess about half that

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Description

🎥 Elevate Every Adventure with Pro-Grade Action Capture

NEVER MISS A MOMENT - Pre-Rec mode captures up to 60 seconds before you hit record, ensuring you always get the perfect shot—even the unexpected ones.
POWER THROUGH YOUR DAY - With up to 160 minutes of continuous recording and seamless DJI Mic 2 integration, this camera keeps your adventures—and your audio—going strong.
CINEMATIC 4 K BRILLIANCE - Capture ultra-smooth, vibrant 4K footage at 120fps with a large 1/1.3-inch sensor and 10-bit color depth for stunning detail and true-to-life colors.
PRO LEVEL STABILIZATION - Three advanced stabilization modes plus Magnetic Quick Release let you effortlessly switch between horizontal and vertical shots for flawless vlogs and dynamic content.
BUILT FOR EXTREME ADVENTURES - Dive, surf, or hike worry-free with waterproof durability up to 18 meters and cold resistance down to -20°C, engineered for every thrill-seeker’s journey.

The DJI Osmo Action 4 Standard Combo is a cutting-edge 4K action camera featuring a large 1/1.3-inch sensor, 10-bit color, and 120fps slow-motion capture. Waterproof up to 18 meters and resistant to extreme cold, it offers pro-level stabilization and innovative Pre-Rec mode to never miss a moment. With a long-lasting 160-minute battery and seamless audio integration, it’s the ultimate tool for travel, extreme sports, and vlogging professionals seeking unmatched clarity and reliability.

Specifications

Package Dimensions L x W x H	12.1 x 9.3 x 5.2 centimetres
Package Weight	0.31 Kilograms
Product Dimensions L x W x H	7 x 4.4 x 3.3 centimetres
Item Weight	145 Grams
Brand	DJI
Colour	black
Has image stabilisation	Yes
Included components	Osmo Action 4 x 1, Osmo Action Anti-Slip Pad x 1, Osmo Action Curved Adhesive Base x 1, Osmo Action Extreme Battery x 1, Osmo Action Horizontal-Vertical Protective Frame x 1, Osmo Action Lens Hood x 1, Osmo Action Quick-Release Adapter Mount x 1, Osmo Locking Screw x 1, Type-C to Type-C PD Cable x 1
ISO Range	100-12800
Max Focal Length	24 Millimetres
Min Focal Length	8.5
Minimum shutter speed	30 Seconds
Model year	2024
Part number	CP.OS.00000269.01
Water Resistance Level	Waterproof
Zoom Type	Digital
Focus type	Manual Focus
Maximum shutter speed	1/8000 Seconds
Style	Standard Combo
Effective still resolution	10
Guaranteed software updates until	31 Dec. 2026

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