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The bot supports two drivers:
  • Claude Code via @anthropic-ai/claude-agent-sdk
  • Codex via @openai/codex-sdk
Claude is the default active driver for a fresh preference state. Codex is available only when CODEX_ENABLED=true.

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Claude Code vs Codex

AspectClaude CodeCodex
ProviderAnthropicOpenAI
Driver toggle/switch claude/switch codex
Enabled by defaultYesNo (CODEX_ENABLED=true required)
Model picker/model (Claude list)/model (Codex live list)
Reasoning effort valueslow, medium, highminimal, low, medium, high, xhigh

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Claude Models (from src/session.ts)

Current built-in Claude model list:
  • claude-opus-4-6 (Opus 4.6) — most capable for complex work
  • claude-sonnet-4-6 (Sonnet 4.6) — everyday tasks
  • claude-haiku-4-5-20251001 (Haiku 4.5) — fastest
Claude preference defaults (if no saved prefs exist):
  • Model: claude-opus-4-6
  • Effort: high
  • Active driver: claude
In the /model UI, effort buttons are hidden when Haiku is selected.

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Codex Models (from src/codex-session.ts)

The bot tries to fetch Codex models live from codex app-server (model/list, includeHidden: false). If live fetch is unavailable, it falls back to this built-in list:
  • gpt-5.3-codex (GPT-5.3 Codex) — most capable (recommended)
  • gpt-5.3-codex-spark (GPT-5.3 Codex Spark) — fast, real-time (Pro)
  • gpt-5.2-codex (GPT-5.2 Codex) — previous generation
Codex preference defaults (if no saved prefs exist):
  • Model: gpt-5.3-codex
  • Reasoning effort: medium

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Switching Drivers

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/switch

  • /switch with no argument shows inline buttons for claude and codex.
  • /switch claude forces Claude mode.
  • /switch codex forces Codex mode and attempts to start a Codex thread immediately.
  • If Codex is disabled, /switch replies with: Codex is not enabled. Set CODEX_ENABLED=true in environment.

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Choosing Model and Effort

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/model on Claude

Shows Claude models above plus effort buttons:
  • Low
  • Medium
  • High (default)

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/model on Codex

Shows live/fallback Codex models plus effort buttons:
  • Minimal
  • Low
  • Medium (default)
  • High
  • X-High (deepest)
Changing Codex model or effort starts a fresh Codex thread so the new settings apply immediately.

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Codex Runtime Policy Defaults (src/config.ts)

These env vars are parsed with safe defaults: 
CODEX_ENABLED=false
META_CODEX_SANDBOX_MODE=workspace-write
META_CODEX_APPROVAL_POLICY=never
META_CODEX_NETWORK_ACCESS=false
Valid values:
  • META_CODEX_SANDBOX_MODE: read-only, workspace-write, danger-full-access
  • META_CODEX_APPROVAL_POLICY: never, on-request, on-failure, untrusted
  • META_CODEX_NETWORK_ACCESS: true or false
Invalid values fall back to defaults (workspace-write, never, false) with a warning.