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Claude Code vs Bernstein
Claude Code is Anthropic's official terminal-native coding agent. It runs as a single Node binary, supports MCP, and ships per-project skills. Designed for one developer driving one repo at a time.
Last verified against @anthropic-ai/claude-code 2.1.x on 2026-05-05.
Install both
Claude Code
curl -fsSL https://claude.ai/install.sh | sh (or brew install --cask claude-code)Bernstein
pipx install bernsteinApache-2.0 · 42 adapters · Python scheduler · zero LLM tokens spent on coordination.
Feature matrix
| Capability | Claude Code | Bernstein |
|---|---|---|
| License | Anthropic proprietary | Apache-2.0 |
| Authentication | Anthropic API key or Claude Pro/Max subscription | 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 | Claude Code + 41 other adapters in parallel |
Source: src/bernstein/adapters/claude.py · upstream
When to choose which
Choose Claude Code
If your work fits one focused thread per session, Claude Code alone is faster than wrapping it in an orchestrator. The CLI is mature, the cache-control story is best-in-class, and the Claude Pro/Max subscription is a fixed-cost option Bernstein cannot replicate.
Choose Bernstein
If you want to run Claude Code alongside Codex, Cursor, or Aider on the same goal — Bernstein splits the goal into parallel tasks and routes each to the cheapest agent whose recent pass rate is above threshold. Claude Code is then ONE adapter among 42, not the only seat at the table.
FAQ
Does Bernstein replace Claude Code?
No. Bernstein wraps Claude Code as one of 42 adapters and routes tasks to it based on a per-task pass-rate history. Claude Code keeps doing what it does well; the orchestrator decides when it gets the work.
What does the audit chain give me that Claude Code 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 Claude Code 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.