- **New:** `drivers/zaicoding` calls Z.ai Coding's OpenAI-shaped endpoint and applies its per-model thinking controls. `LookupModel` supplies metadata for GLM 4.5 Air, GLM 4.7, and GLM 5.1 through GLM 5.3. - Tool loops now retain Z.ai `reasoning_content` and replay it with the assistant tool-call message on the next provider request. The generic OpenAI transport exposes a trusted assistant-message extension for provider drivers that need this behavior. - `ReasoningEffortNone` now reaches drivers that can disable thinking but do not accept numeric effort grades. - Existing OpenAI and Anthropic callers need no changes. Applications using Z.ai Coding should construct `zaicoding.NewDriver` and select models with `zaicoding.LookupModel`.