The :extended variant is retired; pick a model whose context fits your input.
The :extended variant is retired. It reached versions of a model with a larger context window; the models that offered it have been retired, no model carries it now, and a model:extended name answers 404.
Use the model's own name, and pick a model whose context fits your input. Each model's context_length is on GET /v1/models and on its page in the catalogue. For a prompt a little too long, the context compression plugin cuts its middle to fit.