Users on native DeepSeek were told to pin model.context_length and model.supports_vision in config.yaml. That is the wrong layer: the 1M window is already in DEFAULT_CONTEXT_LENGTHS, and a global supports_vision pin would also mark text-only deepseek-v4-pro as multimodal. Two catalog gaps still produced the reported symptoms: - A leftover context_length_cache.yaml entry of 128K (the old ``deepseek`` catch-all) outlived the 1M catalog keys because deepseek-flash was missing from _PRE_CATALOG_STALE_KEYS. - When models.dev is empty/cold, Flash has no capability record, so image routing falls through to lossy text. Vendor docs (2026-09-10) mark deepseek-flash as vision-capable and deepseek-v4-pro as not. Discard those 128K leftovers, fill Flash (and retired Flash aliases) via _BUILTIN_MODEL_METADATA, and leave Pro catalog-only.
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