codex-first

Codex First

Launch flags — read first, copy verbatim

Default every Codex worker, fresh or resumed, to GPT-6.1 Sol, high reasoning, Ultrafast service tier (service_tier="ultrafast"). Pass all three settings unless the user requests an override.

# fresh
codex exec --yolo -C "$WT" \
  -m gpt-6.1-sol -c 'model_reasoning_effort="high"' \
  --enable fast_mode -c 'service_tier="ultrafast"' \
  -c 'model_auto_compact_token_limit=260000' \
  -o "$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="ultrafast"' \
  -c 'model_auto_compact_token_limit=260000' -o "$OUT" -

• Ultrafast has a context ceiling (measured 2026-10-13, direct Responses probes, gpt-6.1-sol + gpt-6-astra): served ultrafast up to ~282k prompt tokens, flaky at 288–294k, fast at ≥300k — silently, HTTP 200. Config default compacts at 400k, so long workers drift to Fast; the 260k compact cap keeps them Ultrafast. Rollouts record only the requested tier; prove the served tier with a direct probe (response.service_tier).
• 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. Those profiles forfeit Ultrafast above ~280k.
• Copy all model/reasoning/tier flags into wrappers; override only on user request. Verify launch arguments (ultrafast default; requested fast is valid).
• For requested Fast reviews, use --codex-speed fast.

Cyber-classifier refusal → Daybreak Red (Peter, 2026-10-15)

Worker stops with This content was flagged for possible cybersecurity risk → relaunch or resume the same order on Daybreak Red (Peter: "use daybreak red if you hit a blocker with regular models"). Don't rephrase to dodge the classifier or hop between regular models.

• Direct API only: the ChatGPT-account route returns 400 not supported when using Codex with a ChatGPT account. Add -c 'model_provider="openai_api_direct"' (API key via the provider's auth command in ~/.codex/config.toml).
• Slug: the model_catalog_json entry whose display_name is Daybreak Red. Keep it out of public artifacts (commits, PRs, issues, logs) per public model naming.
• No Ultrafast: drop --enable fast_mode / service_tier; keep model_reasoning_effort="high".
• Verified 2026-10-15 with a one-line codex exec probe on the direct provider.