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Cursor Agent vs Bernstein
Cursor publicly launched a real terminal CLI on 2026-01-16 and shipped a v3 agent-first UX in April plus the Cursor SDK in May 2026, all sharing the same `cursor-agent` binary surface.
Last verified against cursor-agent 2026.05.x on 2026-05-05.
Install both
Cursor Agent
curl https://cursor.com/install -fsS | bash (macOS/Linux/WSL)Bernstein
pipx install bernsteinApache-2.0 · 42 adapters · Python scheduler · zero LLM tokens spent on coordination.
Feature matrix
| Capability | Cursor Agent | Bernstein |
|---|---|---|
| License | Anysphere proprietary | Apache-2.0 |
| Authentication | Cursor account login (`cursor-agent login`) | Per-agent credential scoping (no global key) |
| Parallel-safe in worktrees | Yes | Yes (designed around git worktrees) |
| MCP support | Yes | Yes (MCP server + tool injection) |
| HMAC-chained audit log | No | Yes (RFC 2104 SHA-256 chain in .sdd/) |
| Coordinator is an LLM | — | No — deterministic Python scheduler |
| Multi-agent orchestration | One agent in a terminal | Cursor Agent + 41 other adapters in parallel |
Source: src/bernstein/adapters/cursor.py · upstream
When to choose which
Choose Cursor Agent
If your team already pays for Cursor Pro and you want their model-routing decisions (which often pick the right thing) without managing N provider keys yourself. The IDE and the CLI share a session, so handoff between editing in Cursor and shipping with `cursor-agent` is seamless.
Choose Bernstein
When the per-seat Cursor cost stops scaling — Bernstein lets you run one Cursor seat plus Claude/Codex/Aider in parallel and merge the result. The orchestrator is open-source, on-prem, and the audit log is yours, which is the part Cursor can't unlock at any price tier today.
FAQ
Does Bernstein replace Cursor Agent?
No. Bernstein wraps Cursor Agent as one of 42 adapters and routes tasks to it based on a per-task pass-rate history. Cursor Agent keeps doing what it does well; the orchestrator decides when it gets the work.
What does the audit chain give me that Cursor Agent can't?
An HMAC-SHA256 row chain over every routing decision and every quality-gate result, written under .sdd/. Deleting or rewriting a row breaks the chain and the verifier rejects the file on next read. Useful for compliance reviews where the regulator wants to replay the run.
Can I run Cursor Agent alongside Claude Code, Codex, and Aider in the same session?
Yes. That's the design point. Each agent runs in its own git worktree, so file edits never collide. Bernstein merges results back to the branch only after the configured quality gates pass.