Fastly Ai Accelerator Chat Completion Example

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      "model": "gpt-4o-mini",
      "messages": [
        { "role": "system", "content": "You are a helpful assistant." },
        { "role": "user", "content": "What is the capital of France?" }
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      "max_tokens": 50
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      "usage": { "prompt_tokens": 22, "completion_tokens": 8, "total_tokens": 30 },
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