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New models and more accurate cost tracking

New models​

  • Claude Opus 5.5 and Claude Sonnet 5.5 are available in the Claude and Pi harnesses and for prompts. Saved agents on Claude Fable 5 now run on Fable 5.1.
  • xAI: add your xAI key in AI providers and pick Grok for your agents and prompts.

More accurate cost tracking​

We reworked how traces count tokens and compute cost:

  • Cached tokens and cache writes are now part of the cost.
  • Each model call carries its own tokens and cost, so a run's total no longer double counts.
  • Calls through OpenRouter show the cost OpenRouter actually billed.
  • Calls that can't be priced, such as a custom model connection, are marked instead of showing $0.