Chesars 43d2a19f79 feat(openai): add OpenAI token counting API support and public litellm.acount_tokens() ...

- Add OpenAITokenCounter using POST /v1/responses/input_tokens endpoint
- Add litellm.acount_tokens() public async API that auto-routes to provider APIs
- Add proxy endpoint POST /v1/responses/input_tokens for OpenAI-compatible counting
- Transform chat tools format to Responses API format for correct token counting
- Fall back to local tiktoken when provider API unavailable

Fixes #22302

2026-03-04 19:32:05 -03:00

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feat(openai): add OpenAI token counting API support and public litellm.acount_tokens()

2026-03-04 19:32:05 -03:00