Codex CLI vs Devin

Outline an API change for one field

Codex CLI handles this as a draft: Old, new, and who reads it in the snippets I paste. Do not ship the API.

Steps: 4
Cost: low
Time: Forty minutes

Unverified · learn.chatgpt.com · 15 Oct 2026

Draft a test plan for a bug

Codex CLI handles this as a draft: Cases, including the one that should fail today. Do not merge.

Steps: 4
Cost: low
Time: Half an hour

Unverified · learn.chatgpt.com · 14 Oct 2026

Point Codex CLI at one failing check

Codex CLI investigates a single red check, patches it, and shows the command output. It does not rewrite the suite to go green.

Steps: 4
Cost: low
Time: The first hypothesis and the mechanical fix, when the failure is already reproduced locally.

Unverified · learn.chatgpt.com · 14 Oct 2026

List error paths in a handler

Codex CLI handles this as a draft: What the user sees for each branch. Do not deploy.

Steps: 4
Cost: low
Time: Half an hour

Unverified · learn.chatgpt.com · 11 Oct 2026

Implement a small feature that already has acceptance notes

Codex CLI builds a feature described as observable behavior, runs the tests you name, and leaves unrelated files alone.

Steps: 4
Cost: low
Time: A focused implementation pass when acceptance notes already exist.

Unverified · learn.chatgpt.com · 18 Sep 2026

Find dead flags in a config file

Codex CLI handles this as a draft: Flags with no reference in the search I paste. Do not delete them.

Steps: 4
Cost: low
Time: Half an hour

Unverified · learn.chatgpt.com · 12 Sep 2026

Devin playbooks

Draft a migration plan for one table

Devin handles this as a draft: Columns and the backfill question. Do not run SQL.

Steps: 4
Cost: medium
Time: An hour

Unverified · docs.devin.ai · 16 Oct 2026

Draft commit messages for a split

Devin handles this as a draft: One message per hunk group I describe. Do not commit.

Steps: 4
Cost: free
Time: Fifteen minutes

Unverified · docs.devin.ai · 14 Oct 2026

Review a diff for risky calls

Devin handles this as a draft: Network, auth, and migrations. Quote the lines. Do not approve the PR.

Steps: 4
Cost: low
Time: Forty minutes

Unverified · docs.devin.ai · 13 Oct 2026

Ask Devin for a pull request from a tightly written issue

Devin picks up one issue and opens a PR. The playbook tells it which repo, which commands, and what not to touch.

Steps: 4
Cost: medium
Time: A first implementation pass on an issue that already has repro steps. Review time does not go to zero.

Unverified · docs.devin.ai · 9 Oct 2026

Draft a rollback note

Devin handles this as a draft: The command in the runbook I paste and the signal that means stop. Do not execute it.

Steps: 4
Cost: low
Time: Twenty minutes

Unverified · docs.devin.ai · 8 Oct 2026

Review a Devin session before anyone merges

Use Devin's session output as a review packet: commands run, files touched, and tests actually executed. The playbook is for the reviewer, not a second coding agent.

Steps: 4
Cost: medium
Time: Reconstructing what the agent did, which is often longer than reading a normal PR.

Unverified · docs.devin.ai · 18 Sep 2026