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`mixtral-8x-7b-instruct` was recently retired from Fireworks Serverless. Here we remove the default model altogether, so that the model must be explicitly specified on init: ```python ChatFireworks(model="accounts/fireworks/models/llama-v3p1-70b-instruct") # for example ``` We also set a null default for `temperature`, which previously defaulted to 0.0. This parameter will no longer be included in request payloads unless it is explicitly provided.