Netflix has published its official Camera Production Guide for the ARRI ALEXA 35 Xtreme, confirming the camera’s place in the Netflix 4K Originals ecosystem. That part is not exactly shocking. The ALEXA 35 Xtreme is ARRI’s new high-end Super 35 flagship, designed for premium productions that need the ALEXA 35 image pipeline with more speed, more recording flexibility, and more workflow options. However, the more interesting part is not the approval of the camera itself. It is the appearance of ARRICORE.

ARRICORE enters the Netflix workflow

The Netflix Production Guide lists the ARRI ALEXA 35 Xtreme for 4K Originals with three major capture paths: ARRIRAW, Apple ProRes, and ARRICORE. The latter is ARRI’s next-generation compressed RGB codec, currently available only in the ALEXA 35 Xtreme. According to the guide, ARRICORE is designed to deliver the ALEXA 35 Xtreme’s image quality at more accessible data rates. The practical benefits are clear: fewer Compact Drives on set, longer recording times per drive, and faster download speeds. At the same time, ARRICORE keeps important post-production flexibility, since sensitivity, white balance, and tint are not baked into the recorded image. In other words, ARRICORE sits between the heavy-duty ARRIRAW workflow and the more familiar ProRes workflow. For productions that want ARRI’s premium image pipeline but need better data efficiency, that is exactly where the codec becomes interesting.

Approved sensor modes for Netflix 4K Originals

The Netflix guide lists multiple ALEXA 35 Xtreme sensor modes as compliant capture options for 4K Originals, including:

• 4.6K 3:2 Open Gate
• 4.6K 16:9
• 4K 16:9
• 3.8K 16:9
• 3.8K 2.39:1
• 3.3K 6:5

The 4.6K 3:2 Open Gate mode is presented as the maximum-quality and maximum-flexibility option. It records the full sensor area and gives productions more room for VFX, reframing, stabilization, rotation, and post adjustments. That makes it especially useful for high-end spherical and anamorphic work. The 3.8K 2.39:1 mode is also worth noting. Netflix states that this mode fulfills the 4K mandate as long as the full 3840-pixel width is used and the image is not horizontally cropped. That gives productions a more data-efficient path for 2.39:1 deliverables while still remaining inside Netflix’s 4K requirements.

ARRICORE and high-speed shooting

The ALEXA 35 Xtreme is also about speed. In ARRICORE, the camera can reach high frame rates across several 4K-compliant sensor modes. With Sensor Overdrive enabled, ARRICORE can go even further, reaching up to 240 fps in selected modes. However, Sensor Overdrive comes with important tradeoffs. The guide notes that when Sensor Overdrive is active, the dynamic range is reduced to 11 stops, Enhanced Sensitivity is disabled, and the EI range is limited. ARRI recommends using Sensor Overdrive only when the desired frame rate is not available without it, and preferably in controlled lighting conditions. That guidance is important. The ALEXA 35 Xtreme can shoot very fast, but the full 17 stops of dynamic range are preserved only when Sensor Overdrive is off.

Final thoughts

The ALEXA 35 Xtreme being approved for Netflix 4K Originals was expected. But ARRICORE appearing inside the Netflix production guide is the real industry update. This is a small but meaningful (and cool) update. The ARRI ALEXA 35 Xtreme has entered the Netflix-approved ecosystem, and ARRICORE makes its debut as a supported capture option for 4K Originals. The camera approval itself was obvious. The ARRICORE approval is the story. See the Netflix Production Guide here.