headlongPersistent-agency agent harness in ~10K lines of Bash: it keeps thinking between messages, thinks by writing shell commands, and one shared mind serves a whole team over Slack or Telegram.
Why switchBoth are Recursive Language Model harnesses where the agent thinks in code rather than in tool-call JSON. Prime-agent uses a persistent IPython REPL and targets coding/research with evidence-backed self-refinement; Headlong uses Bash and targets open-ended persistent agency.
Full comparison → openinterpreterTerminal coding agent optimized for low-cost open models — a Rust Codex fork with switchable harness emulation (claude-code, kimi-code, qwen-code…), ACP support and Codex SDK compatibility.
Why switchStandalone terminal coding agents outside the vendor CLIs: Open Interpreter tunes per-model harnesses for cheap open weights; Prime Agent bets on a persistent REPL and self-refining harness state.
Full comparison → mini-swe-agentThe 100-line agent from the SWE-bench team: >74% on SWE-bench Verified with no tools but bash, no config sprawl — the reference minimal harness, adopted by Meta, NVIDIA and Ramp.
Why switchThe two poles of coding-agent design: mini-swe-agent proves 100 lines and bash suffice; Prime Agent bets on a persistent REPL, subagents and self-refining harness state.
Full comparison → OpenManusOpen-source general autonomous agent from the MetaGPT team — the 'Manus without an invite code': browsing, tool use and multi-step task execution from a simple Python core.
Why switchBoth are open autonomous agents for long tasks; OpenManus goes general-purpose browsing-and-tools, Prime Agent specializes in coding/research with durable programmatic state.
Full comparison → hyperresearchDeep-research harness for Claude Code: a 16-step, tier-adaptive pipeline with adversarial critics, cite-checking and 250+ sources per run, every source kept in a persistent markdown+SQLite vault.
Why switchBoth are self-improving research agents that keep state across sessions; prime-agent centers an RLM + IPython, hyperresearch a fixed adversarial pipeline inside Claude Code.
Full comparison →