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You’re Using Fable 5 Wrong (Do This Instead)

2026-07-08 Science & Technology
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Prompt Engineering
Prompt Engineering
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Description

Fable 5 is a planning model, not a coding model, and treating it like both is how you burn an entire Max subscription in one session. This video breaks down the advisor and orchestrator patterns that let Fable 5 plan while Opus 4.8 executes, cutting your usage to a fraction of the cost with almost no drop in accuracy. LINKS: https://x.com/ClaudeDevs/status/2074606058128224365 https://platform.claude.com/docs/en/agents-and-tools/tool-use/advisor-tool https://github.com/anthropics/claude-cookbooks/blob/main/managed_agents/CMA_plan_big_execute_small.ipynb https://x.com/ericzakariasson/status/2072639126034137444 https://platform.claude.com/docs/en/managed-agents/multi-agent https://github.com/BuilderIO/skills/blob/main/skills/efficient-fable/README.md My voice to text App: whryte.com Website: https://engineerprompt.ai/ RAG Beyond Basics Course: https://prompt-s-site.thinkific.com/courses/rag Signup for Newsletter, localgpt: https://tally.so/r/3y9bb0 Let's Connect: 🦾 Discord: https://discord.com/invite/t4eYQRUcXB ☕ Buy me a Coffee: https://ko-fi.com/promptengineering |🔴 Patreon: https://www.patreon.com/PromptEngineering 💼Consulting: https://calendly.com/engineerprompt/consulting-call 📧 Business Contact: [email protected] Become Member: http://tinyurl.com/y5h28s6h 💻 Pre-configured localGPT VM: https://bit.ly/localGPT (use Code: PromptEngineering for 50% off). Signup for Newsletter, localgpt: https://tally.so/r/3y9bb0 00:00 – Why You’re Killing Your Rate Limits 01:07 – Pattern 1: Fable 5 as an Advisor 02:23 – Pattern 2: Fable 5 as an Orchestrator 03:40 – Setting Up the Advisor Tool (SDK Example) 04:47 – Multi-Agent Setup: Coordinator & Sub-Agents 05:13 – Implementing Patterns in Cloud Code 06:47 – The Power of Reusable Skills vs. Simple Prompts 07:50 – Industry Standards: Insights from the Cursor Team 08:19 – Performance & Cost Analysis: Solo vs. Advisor Pattern 09:27 – Choosing the Right Reasoning Effort Level

Top Comments (10)

@adumont 2026-07-08

Isn't it overkill to delegate to Opus for web search? Isn't Haiku sufficient for that? I mean wth?

2 2 replies
@shashanksinghal8395 2026-07-08

I was using superpowers sdd skill, which have instructions to start implementation using subagents only.

2 1 replies
@Anselm243 2026-07-08

If you make sure that all planning tasks must include code snippets with Fable or Opus. Then code execution can be done with Haiku or sonnet 4.6. Don’t waste your tokens Haiku can follow instructions just as well as any model.

1 4 replies
@engineerprompt 2026-07-08

Checkout my Speech to text app for MacOS: https://whryte.com/

1 1 replies
@MarkyGoldstein 2026-07-09

The best is to start with super cheap models like DeepSeek or Gemma and then to climb up the ladder. You will see that DeepSeek is damn good for certain things. In the end you combine multiple models in your harvest.

1
@Azizme_com 2026-07-08

Thanks from Saudi!

0 1 replies
@scrollop 2026-07-08

DO you have a link to the actual script or prompt?

0 1 replies
@svuvich 2026-07-08

pro tip: when you pay per token price you stop using Claude almost completely

0 1 replies
@MeinDeutschkurs 2026-07-08

They extended… Not enough anti patterns collected? 😂 Jokes aside. Since the export restrictions I have a new credo: good enough is completely on point. 🎉 If Sonnet fails I ask Opus. If Opus fails I ask Fable (as long as it is available, I’ll never pay separately). And I always tell Claude which model is to use for sub agents. (Claude Code Desktop) - Btw, sometimes Opus and Sonnet use autonomously Haiku-agents to solve certain tasks. I was surprised seeing Haiku at the stats.

0
@axer552 2026-07-08

yo

0

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