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Adaptive Thinking Fundamentals
How Fable 5's always-on adaptive thinking works, why budget_tokens is gone, and how the model decides how hard to think within an effort ceiling.
Start lessonAlways-On Thinking & Effort Levels
Master Fable 5's adaptive thinking model: the five-level effort dial, summarized thinking display, and choosing the right depth for every workload.
Lessons in this module
Follow the lessons sequentially for best understanding
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The Five Effort Levels: low to max
A practical selection framework for output_config.effort — what each of the five levels is for, how cost and latency scale, and how to route workloads across them.
Start lesson3
Summarized Thinking in Practice
Use display: 'summarized' to get readable reasoning summaries for debugging, auditing, and user-facing progress — and know when to leave it omitted.
Start lessonKey skills
What you'll master in this module
Practical knowledge
Gain practical experience you can apply immediately
Expertise
Develop deeper domain expertise
Communication
Learn to communicate your knowledge effectively
Documentation
Create your own notes and documentation
Problem analysis
Learn systematic approaches to complex problems
Optimization
Optimize for performance and efficiency
Tips for success
How to get the most out of this module
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Proceed step by step
Don't move on until you fully understand the previous lesson
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Practice regularly
Spend daily time on the practical lesson exercises
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Take notes
Write down key insights and your own thoughts
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Ask questions
If something is unclear, ask the community for help
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Test knowledge
Validate learning with exercises and quizzes
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Share insights
Teach concepts to others to reinforce retention