Get LLM usage costs for a specific prompt optimization run.

This endpoint returns the total cost and detailed usage records for all LLM requests made during a prompt optimization run. Use this to track costs associated with optimizing prompts for different target models.

Cost Breakdown:

• Total cost across all models used in the optimization
• Individual usage records with provider, model, tokens, and costs
• Timestamps for each LLM request

Access Control:

• Only accessible by the user who created the optimization run
• Requires prompt optimization access