Codex First

Launch flags, read first, copy verbatim

Default every Codex worker, fresh or resumed, to GPT-6.1 Sol, high reasoning, Fast service tier (service_tier="fast", sent as API priority; Peter, 2026-10-30). Pass all three settings unless the user requests an override.

# fresh
codex exec --yolo -C "$WT" \
  -m gpt-6.1-sol -c 'model_reasoning_effort="high"' \
  --enable fast_mode -c 'service_tier="fast"' \
  -o "$OUT" - < "$ORDER"
# resume: pass the same flags again; resume does not inherit them
codex exec resume "$SID" --dangerously-bypass-approvals-and-sandbox \
  -m gpt-6.1-sol -c 'model_reasoning_effort="high"' \
  --enable fast_mode -c 'service_tier="fast"' -o "$OUT" -

• Old Codex CLIs silently omit tiers they do not know (codex-cli 0.147 on Team warned not advertised and sent no tier); keep the CLI current. Verified on Team with 0.166.0, 2026-10-30.
• Ultrafast only on request: swap in -c 'service_tier="ultrafast"' and add -c 'model_auto_compact_token_limit=260000'. It is served up to ~282k prompt tokens, flaky at 288, 294k, and silently fast at ≥300k (measured 2026-10-13); the 260k cap keeps it there. Rollouts record only the requested tier; prove the served tier with a direct probe (response.service_tier). Details: launch details.
• Context: workers get the base 500k window. Add -p sol61-1m (or -p astra-1m) only when the order needs a whole-repo context; see $codex-huge-context.
• Copy all model/reasoning/tier flags into wrappers; override only on user request. Verify launch arguments (fast default; requested ultrafast is valid).

Security audits and cyber-classifier refusals → Daybreak Red (Peter, 2026-10-15/18)