Letta Code Context Repositories: Git-Backed Memory Versioning for Coding Agents — #1 Model-Agnostic Harness on TerminalBench

Letta Blog·high signal

Letta Code introduced Context Repositories, a rebuild of agent memory using git-based versioning where every memory change gets a commit with informative messages. Agents can manage their own context through progressive disclosure and token-space rewriting, and concurrent subagents handle memory conflicts via standard git operations (merge, rebase). Letta Code is now #1 on TerminalBench among model-agnostic harnesses, matching provider-built tools (Claude Code, Gemini CLI, Codex CLI) on their own models while being portable across Claude, GPT-5, Gemini, and GLM.