The Complete Claude Guide
Chapter 03 · WEB

Models, effort and extended thinking

Model selection and effort are separate decisions. The model determines the model family and capabilities; effort or extended thinking adjusts how Claude approaches a task where supported. More thinking does not guarantee correctness.

Verified against source on 2026-09-30

Video

Steps

  1. Open the model picker and inspect what your plan offers. Names and models change. Prefer the live list over a name from an old video.
  2. Match model and speed to the work: a short draft is different from a multistep analysis. Check whether the selected model offers effort, extended thinking or other controls.
  3. Try the same task with two settings. Compare quality, latency and the corrections needed. Ask for an explanation you can verify, rather than treating everything shown during thinking as a final conclusion.
  4. Review usage and account limits. A Claude subscription and an API account are separate billing products. Do not enable paid extra usage without understanding the cost.
Common pitfall: Do not choose a model just because its name sounds newer. Availability and controls change, and billing differs across products.
Hands-on exercise: Solve a small planning problem with two available settings. Record what improved and what did not, without changing billing settings.
Filmed demo · Video is added in the media phase

Recap

Comprehension check

Does a higher effort setting verify Claude's answer?

Recap

Official sources

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