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docs: update for pipecat PR #4009 #623

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1 change: 1 addition & 0 deletions server/services/llm/perplexity.mdx
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Expand Up @@ -126,6 +126,7 @@ llm = PerplexityLLMService(
- Perplexity does not support function calling or tools. The service only sends messages to the API, without tool definitions.
- Perplexity uses incremental token reporting. The service accumulates token usage metrics during processing and reports the final totals at the end of each request.
- Perplexity models have built-in internet search capabilities, providing up-to-date information without requiring additional tool configuration.
- **Message transformation**: Perplexity's API enforces stricter constraints than OpenAI on conversation history structure (strict role alternation, no non-initial system messages, last message must be user/tool). The service automatically transforms messages to satisfy these constraints before sending them to the API, so you don't need to manually structure your conversation history.

<Tip>
The `InputParams` / `params=` pattern is deprecated as of v0.0.105. Use
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