The whole hunk
from line 207, old and new numbered
/
lines
from line 207
207207mid-session. *Sonnet* is the workhorse default for everyday feature work,
208208bugs, tests, and reviews. Reach for *Opus* on large refactors, gnarly
209209debugging, or anything high-stakes. Drop to *Haiku* for quick questions,
210formatting, and mechanical edits where speed wins. *Fable 5* is the most
210formatting, and mechanical edits where speed wins. *Fable* is the most
211211capable model for your hardest, longest-running tasks; it is not the
212212default, so select it with `/model fable`, and note that cybersecurity and
213213biology content falls back to Opus automatically. Opus 5 runs its own
from line 220
220220📖 Model configuration → https://code.claude.com/docs/en/model-config
221221```
222222
223| Model | Best for |
224| ------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
225| Fable 5 | The hardest, longest-running tasks. Opt-in only: select it with `/model fable`. Cybersecurity or biology content [falls back to Opus](/docs/en/model-config#automatic-model-fallback) |
226| Opus | Large-scale refactors, complex debugging, architecture decisions, high-stakes changes. On Opus 5, cybersecurity or biology content triggers [automatic model fallback or a refusal](/docs/en/model-config#automatic-model-fallback) |
227| Sonnet | Everyday feature work, bug fixes, tests, documentation, code review. Recommended default. |
228| Haiku | Quick questions, formatting, mechanical edits, rapid iteration |
223| Model | Best for |
224| ------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
225| Fable | The hardest, longest-running tasks. Opt-in only: select it with `/model fable`. Cybersecurity or biology content [falls back to Opus](/docs/en/model-config#automatic-model-fallback) |
226| Opus | Large-scale refactors, complex debugging, architecture decisions, high-stakes changes. On Opus 5, cybersecurity or biology content triggers [automatic model fallback or a refusal](/docs/en/model-config#automatic-model-fallback) |
227| Sonnet | Everyday feature work, bug fixes, tests, documentation, code review. Recommended default. |
228| Haiku | Quick questions, formatting, mechanical edits, rapid iteration |
229229
230230**Quick wins to try first**
231231