server/utils/AiProviders/anthropic/index.js, server/utils/AiProviders/openAi/index.js

It's a good practice to set a default model for the AI providers in case the environment variable is not set. This will prevent the application from crashing due to an undefined model. However, it would be better to move the default model to a constant at the top of the file for better readability and maintainability.
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    const DEFAULT_ANTHROPIC_MODEL = "claude-2";
    const DEFAULT_OPENAI_MODEL = "gpt-3.5-turbo";

    // Then use these constants when setting the model
    this.model = process.env.ANTHROPIC_MODEL_PREF || DEFAULT_ANTHROPIC_MODEL;
    this.model = process.env.OPEN_MODEL_PREF || DEFAULT_OPENAI_MODEL;

server/utils/AiProviders/openAi/index.js

It's a good practice to use the class property this.model instead of the environment variable process.env.OPEN_MODEL_PREF when checking if the model is valid. This is because the class property this.model has already been set with the environment variable or the default model. This makes the code more readable and less error-prone.
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    if (!(await this.isValidChatCompletionModel(this.model)))