Deploy Claude Fable 5 for Elite-Level Knowledge Work and Coding
Upgrade to Fable 5 for high-tier software engineering and research tasks.
For tasks where Opus or Sonnet struggle, switch to Claude Fable 5, which is optimized for complex software engineering and long-form knowledge work.
The Scenario
You are facing a high-complexity software engineering challenge or a scientific research task that other models are failing to solve accurately.
Before & after
For complex software engineering tasks, users often spent 1-2 hours iterating with Claude Opus or Sonnet to get a working solution for high-level logic.
Switch to Claude Fable 5 for difficult tasks. It is specifically designed to be Anthropic's 'Mythos-class' model for advanced problem solving, and setup takes less than a minute.
The Prompt
Act as a senior software engineer. Fix the following complex bug in this project, ensuring you account for [SPECIFIC_EDGE_CASE]. [PASTE_COMPLEX_CODE_LOGIC_HERE]
Fable 5 is the first public 'Mythos-class' model, which represents a higher tier of capability than the Opus family, particularly for software engineering (scoring 80.3% on SWE-Bench Pro).
Source
Claude Platform - Claude Platform Docs"The longer and more complex the task, the larger Fable 5’s lead over our other models."