| name | fleet-doctrine |
| description | Model routing strategy for multi-model AI fleet. Use when spawning sub-agents, choosing models for cron jobs, delegating coding tasks, or deciding which model should handle a task. Covers Opus, Codex, Sonnet, Gemini, and Grok routing rules. |
Fleet Doctrine — Model Routing
Aliases
opus → anthropic/claude-opus-4-6sonnet → anthropic/claude-sonnet-4-6codex → openai-codex/gpt-5.3-codex- Gemini:
google/gemini-3-pro-preview
- Grok:
xai/grok-4
Routing Rules
Opus — Commander
When: Main session, orchestration, security decisions, financial tasks, reviewing other models' output, anything high-stakes or ambiguous.
Never waste on: Routine crons, simple lookups, email summaries, templated tasks.
Codex — Chief Engineer
When: Big coding tasks (refactors, new features, full repo work), PR reviews, debugging complex issues, checking other models' code output.
Spawn as: sessions_spawn(model: "codex", task: "...") or sub-agent with --model codex.
Pairs with: Grok for parallel work or second opinions on code.
Sonnet — Workhorse
When: Cron jobs, email briefings, admissions reports, routine admin, quick lookups, drafts, form letters, anything repetitive or templated.
Default for: All crons unless the task requires reasoning.
Gemini — Creative & Vision
When: Image generation, analysing long documents (1M context), visual tasks, when a different perspective helps.
Best at: Processing massive context windows, multimodal input.
Grok — Fast Backup
When: Parallel work alongside Codex, speed-over-depth tasks, sanity-checking other models' output, when you need a quick second opinion.
Good for: Lightweight code reviews, fast research, draft generation.
Decision Flow
- Is it security, finance, or high-stakes? → Opus
- Is it a big coding task or repo work? → Codex (with Grok as backup)
- Does it need image gen or 1M+ context? → Gemini
- Is it routine/scheduled/templated? → Sonnet
- Need a fast second opinion? → Grok
- Not sure? → Opus decides, then delegates.
Fallback Rule
If a model is unavailable on your instance, fall back to your default model (typically Sonnet). The doctrine describes intent — use the best model you have access to that matches the category. When in doubt, do the task with what you've got rather than failing.
Anti-Patterns
- Don't use Opus for email summaries or cron jobs
- Don't use Sonnet for complex multi-step reasoning
- Don't use Codex for non-coding tasks
- Don't spawn multiple models on the same task unless deliberately seeking a second opinion
