Mozilla report: open models only 4 months behind frontier, but 51% vs 63% reach production
rohanpaul_ai · x · 2026-09-17
Mozilla published a 91-page report with a stark finding: open-weight AI is only 4 months behind the frontier on capability, yet loses at the last mile of production reliability.
Key data:
- 79% of developers use open models, but only 51% reach production vs 63% for closed models.
- Vendor-backed deployments hit production at 67% vs 33% for internal builds.
- The open-closed production gap widens from 1 point at small firms to 16 points at enterprises.
- 8 of OpenRouter's 10 most-used models by August token volume were open-weight, 7 Chinese-built; DeepSeek became the first open model to lead weekly requests.
- Yet open models handled only 20% of measured traffic — the economics are upside down.
Takeaway: teams drop open models not on capability but because they're harder to run reliably.
Related event: Mozilla Report: Open-Weight Models Now Just ~4 Months Behind Frontier(9 posts)→
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