fix: update cost indicator for Claude Opus 4.5

Fabrizio J. Pivarequested to merge
update-claude-opus45-cost-indicator into main

What does this merge request do and why?

This merge request (MR) updates the cost indicator for the recently released model Claude Opus 4.5, that is currently available only for developers.

This MR is needed because the current cost indicator for Claude Opus 4.5 is lower than it should, which can be misleading.

How to set up and validate locally

  1. Check out to this MR's branch.
  2. Open ai_gateway/model_selection/models.yml and verify that Claude Opus 4.5 has a cost indicator of $$$$.
  3. Open docs/model_selection.md and verify that the cost indicator table has been correctly updated. The new table should be just like the one presented in !4112 (comment 2943582772)

Merge request checklist

  • Tests added for new functionality. If not, please raise an issue to follow up.
  • Documentation added/updated, if needed.
  • If this change requires executor implementation: verified that issues/MRs exist for both Go executor and Node executor or confirmed that changes are backward-compatible and don't break existing executor functionality.

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