LLM Prompt Cache Options Across Providers
Compares prompt/KV cache TTLs, controls, pricing, scope, and strategies across major LLM providers.
Openai
LLM Prompt Caching: Implicit vs Explicit
Explains implicit vs explicit LLM prompt caching, prefix constraints, provider support, and when to use each.
PPO — Proximal Policy Optimization
Overview of PPO, the clipped policy-gradient RL algorithm used in RLHF for InstructGPT and original ChatGPT.