Mozilla: open AI gap narrows to 4.4 months, Kimi K3 trails Fable 5 by 3 points

The report arrives as open-weights models, which let anyone download the main model components and run them locally, have gained traction on developer marketplaces. Mozilla's report notes that eight of the top 10 models ranked by token volumes on OpenRouter in August 2026 provide open weights. Yet the money still flows to closed models: a Linux Foundation paper by Frank Nagle and Daniel Yue found open models earned just 4 percent of overall revenue versus 96 percent for closed models, though that data covered May through September of 2025.

Geographically, the best open models are concentrated in China, while the strongest closed frontier models come from US companies. Mozilla CTO Raffi Krikorian said Chinese labs are running the same playbook the Americans ran with Android: give it away, but own the ecosystem around it. He argued the uncomfortable truth is that the plural ecosystem around open-weight AI is largely funded by Chinese capital right now, calling it a plurality and a concentration at the same time. He proposed an alternative coalition of mission-driven institutions, public compute programs, foundations, companies, and philanthropy, and called for going beyond open weights toward more fully open source approaches.

The stakes hinge on whether that concentration risk prompts US and European labs to compete in the same open lane, and on whether open models can convert usage into revenue. If revenue remains lopsided, the funding for open alternatives may stay dependent on a single source, which is the outcome Krikorian's proposed coalition is meant to avoid.