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The Sonnet 4.6 → Sonnet 5 Migration Playbook
Every breaking change and silent default shift in one checklist — with the exact code fix for each.
Start lessonMigration from Sonnet 4.6 & Cost Optimization
Migrate every route from Sonnet 4.6 without a 400, re-baseline for the new tokenizer, and build a cost strategy around intro pricing and effort tuning.
Lessons in this module
Follow the lessons sequentially for best understanding
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Re-Baselining for the New Tokenizer
Sonnet 5's tokenizer produces ~30% more tokens for the same text — measure the shift on your own data and update every token-denominated setting.
Start lesson3
Cost Optimization Strategy
Intro pricing, effort-based routing, prompt caching, and the Sonnet 5 vs Opus decision — a complete cost playbook.
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
1
Proceed step by step
Don't move on until you fully understand the previous lesson
2
Practice regularly
Spend daily time on the practical lesson exercises
3
Take notes
Write down key insights and your own thoughts
4
Ask questions
If something is unclear, ask the community for help
5
Test knowledge
Validate learning with exercises and quizzes
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Share insights
Teach concepts to others to reinforce retention