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duckduckgo-web returned 400 ERR_BAD_REQUEST on every request because the model
catalog advertised ids DuckDuckGo has retired from the free Duck.ai lineup
(gpt-4o-mini, gpt-5-mini, llama-4-scout, mistral-small-2501, o3-mini,
claude-3-5-haiku-20241022). duckchat/v1/chat validates `model` server-side and
rejects retired ids, and normalizeDuckDuckGoModel() defaulted to / passed through
gpt-4o-mini, so the retired id reached the wire verbatim.
Update all three id sources to the current free wire ids captured live from
duckchat/v1/models (2026-07-22): gpt-5.4-mini, gpt-5.4-nano, claude-haiku-4-5,
mistral-small-2603, tinfoil/gpt-oss-120b, tinfoil/gemma4-31b —
- executor: default gpt-4o-mini -> gpt-5.4-mini; legacy ids aliased to the
nearest current model via a lookup map; dropped the invalid gpt-5-mini
"minimal" reasoningEffort;
- freeModelCatalog.data.ts + providers/registry/duckduckgo-web: current ids.
Regression test duckduckgo-web-model-catalog-8000.test.ts asserts no retired id
ever reaches the wire and all three catalogs match the current set (RED on the
old default/passthrough + retired catalogs). Live 200 confirmation remains a
recommended VPS smoke per the plan-file.