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Support reading cached tokens from both legacy format (cache_read_input_tokens) and OpenAI's new format (prompt_tokens_details.cached_tokens). This fixes the issue where Langfuse was not calculating prompt cache discounts because litellm proxy returns cached_tokens in prompt_tokens_details, but the langfuse integration only looked for cache_read_input_tokens at the top level. Changes: - Read cache_read_input_tokens from both top-level and prompt_tokens_details.cached_tokens - Read cache_creation_input_tokens from both top-level and prompt_tokens_details.cache_creation_tokens - Update usage dict to use pre-calculated values instead of getattr Fixes: Langfuse not applying cache discount for OpenRouter/OpenAI models
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tests/litellm/directory, Adding at least 1 test is a hard requirement - see detailsmake test-unitType
🆕 New Feature
🐛 Bug Fix
🧹 Refactoring
📖 Documentation
🚄 Infrastructure
✅ Test
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