Anthropic · CCAR-P
Choosing the Claude model
CCAR-P · Lesson 4 of 18 · 28:31
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In this lesson
Prepare for the Claude Certified Architect – Professional exam, on the exam guide version 1.0, effective July 2026. In this lesson: the Claude model family as of October 2026 (Fable 5.1, Opus 5.5, Sonnet 5.5, and Haiku 5.5), efficiency-first and capability-first approaches, cost per completed task, the effort setting and adaptive thinking, retrying failures at a higher effort, advisor and orchestrator pairings, and pinned model IDs. Includes three original practice questions.
Preview the topics
- Harborline must classify 200,000 documents a day into eight types, in under a second each, and every output can be checked against labels. Where should the architect start?
- Harborline’s claim summaries run on Opus 5.5. The evaluations pass with a clear margin, but the cost is too high. What should the architect try first?
- Harborline’s coding agent runs on Sonnet 5.5, handles most turns well, but stalls on a few hard design decisions. Which design fits?