State of Open Source AI v1.0: performance gap with closed models down to just 3%

What happened

The 'State of Open Source AI — V1.0' report by Mozilla was published on July 17, 2026 at stateofopensource.ai. It is the first comprehensive annual report mapping the open-weight AI ecosystem across technological, commercial, and geopolitical dimensions.

Context and impact

The report highlights a paradox: open models power about a third of real-world AI usage and five of the highest-volume models on OpenRouter are open-weight — yet they capture only 4% of market revenue. The frontier remains closed (reasoning, multimodality), but most production workloads don't need the frontier. The geopolitical angle: three days after Claude Fable 5 went on sale, an export order blocked access for all foreign nationals — a warning about dependence on closed models.

Details

• Performance gap between open and closed models: just 3%
• Inference cost reduction: up to 50x over three years
• DeepSeek: 26,000+ enterprise accounts, 58% of new AI startups in 2025 included it in their stack
• 5 of the highest-volume models on OpenRouter are open-weight
• Open models: ~33% of real-world usage, but only 4% of revenue
• Thinking Machines Inkling (975B params, open-weight) cited as latest example