[Feat] Add GLM-5.3-Flash to Z AI - #1430
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What changed
Adds GLM-5.3-Flash to the Z AI catalogs used by the international API and the international and China Coding Plans. The model exposes vision, a 1M-token context window, 128K maximum output, prompt caching, configurable Low/High/Max reasoning, and published pricing. Z AI requests also retain reasoning across tool calls and send the model's required thinking parameters for streaming and prompt completion.
LiteLLM aliases for GLM-5.3-Flash now preserve interleaved reasoning content. Focused provider, request, fetcher, catalog, and model-selection tests cover the new behavior.
Why this change was made
GLM-5.3-Flash is the efficient multimodal variant of GLM-5.3 and requires the same always-on reasoning semantics with vision enabled. OpenCode Go support is deliberately excluded to avoid overlap with #1428.
Impact
Zoo Code users can select GLM-5.3-Flash on supported Z AI routes and use image input with accurate limits, reasoning controls, request defaults, and cost reporting. China API remains excluded, matching current provider availability.
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