letta-code/benchmarks/terminal_bench

Terminal-Bench Regression

Weekly regression tests for Letta Code on Terminal-Bench 2.0.

How it works

1. GitHub Actions (.github/workflows/terminal-bench-regression.yml) runs every Monday at 5am PT
2. Harbor orchestrates task execution in Modal cloud sandboxes
3. Letta Code is built from source (main branch) inside each sandbox
4. Results are compared against baseline.json and posted to a GitHub issue
5. @devanshrj is tagged if any model drops >5% from baseline

Models

Model	Baseline
sonnet-4.6-xhigh	38/89 (42.7%)
gpt-5.3-codex-xhigh	57/89 (64.0%)

Files

File	Description
letta_code_agent.py	Harbor agent — installs and runs Letta Code CLI in sandbox
install-letta-code.sh.j2	Jinja2 install script (Node.js, Bun, build from source)
baseline.json	Per-model, per-task pass/fail baselines
report.py	Parses results, detects regressions, posts GitHub issue

Manual trigger

gh workflow run terminal-bench-regression.yml --ref main -f concurrency=10

Required secrets

• LETTA_API_KEY — Letta Cloud API key
• ANTHROPIC_API_KEY / OPENAI_API_KEY — LLM provider keys
• MODAL_TOKEN_ID / MODAL_TOKEN_SECRET — Modal sandbox credentials

Updating baselines

Replace baseline.json with results from a new run. Format:

{
  "model-name": {
    "pass_rate": 0.427,
    "tasks": {
      "task-name": true,
      ...
    }
  }
}