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Their other posts in the index, biggest breakout first.
You're prompting Fable 5 wrong. Behavioral differences and prompting patterns for Claude Fable 5 and Claude Mythos 5, covering effort, instruction following, long runs, memory, and scaffolding changes. Copy guide. This guide covers the prompting and scaffolding specific to Claude Fable 5 and Claude Mythos model's capabilities, API changes, pricing, see Introducing Claude Fable 5 and Claude techniques that apply across all current Prompting best practices. Claude Fable 5 takes on problems that were complex, long-running, or ambiguous for prior models, and is particularly effective at end-to-end work that takes a person hours, days, or weeks to complete. The teams seeing the best outcomes apply Claude Fable 5 to their hardest unsolved problems; testing it only on simpler workloads SAVE THIS. All its capability range. It also performs reliably on more straightforward tasks. Claude Fable 5 has several behavioral prompts. Claude Opus 4.8 that may require prompt updates. Capability improvements at this level are also a good prompt to re-evaluate which instructions, tools, and Ask Docs. You're prompting Fable 5 wrong. Official SAVE THIS. Anthropic just released their official prompting guide for Fable 5 and it proves that 99% of you guys are prompting this new model completely wrong. Their official docs explicitly state Fable 5 overplans on vague tasks and fakes progress if you do not check on it. Instead, they want you to prove your work before calling it done and bring in a separate subagent to verify progress on long builds. So, I'll go ahead and drop this link down below. Copy it, paste it into a code and tell it to learn it. Skill creator command. So save this right now before Fable goes back to API pricing and let me know down in the comments how it works for you.