LLM proxy that lets Claude Code talk to any model

DataNebula released open-source rosetta-llm, letting Claude Code call multiple providers through one gateway. It translates Anthropic Messages, OpenAI Chat, and OpenAI Responses, and round-trips encrypted reasoning via the signature field. The key detail is thinking-block fidelity for multi-turn agent prompt-cache hits.

Why it matters: HKR-H/K/R all pass, but this is a Reddit open-source tool post with no adoption, stars, or benchmark data disclosed. Score stays in the mid-weight tooling band, not 78+.