I basically got the idea from another post, and had Code build me something like it. The other post had a security agent, but that kept making Fable fall back to opus so I removed it. This has helped big time in implementing code and saving a massive amount of tokens. I let a project run all night and it only cost me about $20. It normally would have cost me $3-400 in Fable tokens…at least. Edit after some feedback: Tiered Model Workflow for Claude Code A drop-in setup that makes Claude Code switch models automatically based on the kind of work — using native subagents, each pinned to its own model. Architect (Fable) — plans, decomposes the task, writes handoff packages, does the final eval. Never writes code, so its context stays clean. Developer (Opus) — the heavy lifting: real implementation + the build/fix/retry loop. Test-writer (Sonnet) — boilerplate tests, mocks, fixtures, smoke checks. Reviewer (Fable) — reads the diff, worker reports, and Codex’s findings; returns a structured verdict. Read-only. Codex (OpenAI Codex CLI) — an independent second-opinion reviewer (a different model family, so it catches different bugs) and an on-demand troubleshooter when a worker gets stuck. Optional but recommended. The point: keep the expensive, context-sensitive reasoning (Fable) at the two ends, route the high-volume trial-and-error middle to cheaper models, and add a cross-model reviewer (Codex) so no single model’s blind spots slip through. Full rationale and diagram in docs/workflow/TIERED-AGENTS.md . Two disciplines make or break the savings: explicit handoffs (the architect must pass a Definition of Ready before routing, or a cheaper worker will confidently wander down the wrong path) and a boring shared run log ( handoffs/RUN-STATE.md , updated by every tier) so the reviewer reads what happened instead of reconstructing it from chat. Feel free to use…or not…it was just helpful to me. https://github.com/orionmilos0-jpg/fabletieredworkflow/tree/main Best submitted by /u/sideshowwallaby
Originally posted by u/sideshowwallaby on r/ClaudeCode
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