Open-weight models take 56% of token volume, Astra doubles Fable 5.1 spend

This post provides detailed monthly metrics on AI Gateway token volume and spend, specifically highlighting the shift towards open-weight models (now 56% of token volume) and the cost-effectiveness trend (23.2% price drop in August). It analyzes customer migration patterns within Anthropic's model offerings, showing Opus 5 replacing Fable 5 due to a better price-performance ratio. The post also tracks the rapid adoption of new model launches like OpenAI's Astra and Z.ai's GLM-5.3-Flash, demonstrating how model profile and consistency drive customer loyalty across providers.