The Model–Effort–Task Triangle for Codex

The decision behind the technique

Model, reasoning effort and task scope trade speed and usage for capability. Routine edits rarely need the same configuration as an architecture migration, security investigation or ambiguous production failure.

Escalate capability when evidence says the current setup cannot close the task, not before.

A practical step-by-step workflow

Use this sequence as a default, then tighten or expand it only when the evidence changes.

• Classify the task by blast radius and ambiguity
• Start routine work on a balanced model and moderate effort
• Escalate after a failed plan or unresolved evidence gap
• Return to a lighter setup for mechanical follow-up work

Failure boundary and finish line

Repeatedly retrying an underpowered setup can cost more than one justified escalation.

Finish when the next action, owner, evidence and stop condition are all explicit.