Cesar Garcia 829b06f53f Fix: Gemini image_tokens incorrectly treated as text tokens in cost calculation (#17554) ...

When Gemini image generation models return `text_tokens=0` with `image_tokens > 0`,
the cost calculator was assuming no token breakdown existed and treating all
completion tokens as text tokens, resulting in ~10x underestimation of costs.

Changes:
- Fix cost calculation logic to respect token breakdown when image/audio/reasoning
  tokens are present, even if text_tokens=0
- Add `output_cost_per_image_token` pricing for gemini-3-pro-image-preview models
- Add test case reproducing the issue
- Add documentation explaining image token pricing

Fixes #17410

2025-12-05 15:55:38 -08:00

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Fix: Gemini image_tokens incorrectly treated as text tokens in cost calculation (#17554)

2025-12-05 15:55:38 -08:00