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The default model for `ChatGroq`, `"mixtral-8x7b-32768"`, is being retired on March 20, 2025. Here we remove the default, such that model names must be explicitly specified (being explicit is a good practice here, and avoids the need for breaking changes down the line). This change will be released in a minor version bump to 0.3. This follows https://github.com/langchain-ai/langchain/pull/30161 (released in version 0.2.5), where we began generating warnings to this effect. 