Add support for perplexity/sonar-reasoning

[Szpadel]

Adds support for perplexity/sonar-reasoning model from openrouter, It's based on deepseek-r1 so it is threaded in the same way. I noticed that some providers allow setting top_p, I set it to value used in deepseek benchmarks.

Description

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Checklist:

• My code follows the patterns of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

Additional context

Related Issues

Reviewers

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Important

Add support for perplexity/sonar-reasoning model in OpenRouterHandler with specific parameters.

• Behavior:
  • Adds support for perplexity/sonar-reasoning model in OpenRouterHandler.
  • Sets temperature to 0.6 and top_p to 0.95 for perplexity/sonar-reasoning and deepseek-r1 models.
  • Converts messages to R1 format for these models.
• Misc:
  • Minor formatting changes in openrouter.ts.

^{This description was created by for 1534a9c. It will automatically update as commits are pushed.}

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[mrubens]

Is there any chance of this breaking API calls to providers who don't support top_p? If so we might consider doing what we do with the transforms field below.

[Szpadel]

This is the same as with include_reasoning: it's passed to every model, not only for deepseek.

From oupenrouter docs:

Non-standard parameters: If the chosen model doesn't support a request parameter (such as logit_bias in non-OpenAI models, or top_k for OpenAI), then the parameter is ignored. The rest are forwarded to the underlying model API.