Update perplexity cost tracking

[Sameerlite]

Title

Add Perplexity cost extraction from API response

Relevant issues

Fixes #15547

Pre-Submission checklist

Please complete all items before asking a LiteLLM maintainer to review your PR

• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• I have added a screenshot of my new test passing locally
• My PR passes all unit tests on make test-unit
• My PR's scope is as isolated as possible, it only solves 1 specific problem

Type

Bug FIx

Changes

This PR adds cost extraction functionality to Perplexity's chat transformation, allowing Perplexity to override LiteLLM's cost calculation by providing its own cost information in the API response.

I have updated perplexity provider to base_llm_http_handler and its own transformation methods. And I have used concept of over riding the cost as now perplexity provides cost in its response itself

This change ensures Perplexity users get accurate cost tracking that reflects the provider's actual pricing, improving cost transparency and accuracy for Perplexity API usage.

Change in perplexity API repsonse:

"usage": {
    "prompt_tokens": 5,
    "completion_tokens": 308,
    "total_tokens": 313,
    "search_context_size": "low",
    "cost": {
      "input_tokens_cost": 0,
      "output_tokens_cost": 0,
      "request_cost": 0.005,
      "total_cost": 0.005
    }
  }

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Project	Deployment	Preview	Comments	Updated (UTC)
litellm	Ready	Preview	Comment	Oct 20, 2025 6:10pm

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