feat: add Anthropic prompt caching for cost and latency reduction #20
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Enable prompt caching via OpenRouter for Anthropic models (Claude Sonnet/Haiku). This can reduce input token costs by up to 90% and latency by up to 85% for repeated system prompts. Changes: - Add llm_enable_prompt_caching config option (default: true) - Add cache_control to system messages in OpenRouterProvider - Log cache hit/write metrics for observability - Update .env.example with new config option Closes: retriever-ghs
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Summary
llm_enable_prompt_cachingconfig option (default: true)Changes
src/config.py: Addllm_enable_prompt_cachingsettingsrc/infrastructure/llm/openrouter.py: Add cache_control to system messages, log cache metricssrc/web/routes.py: Pass caching config to provider.env.example: Document new config optiontests/test_llm_provider.py: Add comprehensive tests for caching behaviorBenefits
Test plan
Closes: retriever-ghs