A buyer's guide for engineering and platform leaders weighing open-weight models against hosted frontier APIs. It covers where the capability gap actually is, the cost lines most business cases miss, four deployment patterns, and the licence questions that stall procurement.

In this white paper, you'll discover:

• The decision in front of you: The default is still the hosted frontier API, and for good reasons.
• What owning the weights actually buys you: An open-weight model is a file you can copy, which changes four things enterprises care about.
• Where the gap still is, and where it is not: A capability gap of a few ECI points is not evenly distributed, and treating it as one number is the most common analytical mistake in this decision.
• Which open-weight models are competitive today: Averages across families hide the models themselves, so it is worth naming the current leaders.
• What the top of the ranking measures: The names at the top of that table are genuinely ahead, and the section above describes where.

Download the full white paper below for the complete analysis, architecture detail, and implementation guidance.