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> But, for many tasks, ultra mode is possibly worse and certainly more expensive. Went through something similar. Fable would just spends minutes thinking, pr

• Huppie 3mo ago
  Simon Willison recently had a useful tip instructing Claude to use its judgement to pick an appropriate model for tasks. After a short discussion about the idea with Claude mostly on how it fits in my workflow and what models / effort I would like for certain tasks it placed a paragraph in my global Claude.md and it has worked wonders. Ultra became a lot better (faster, cheaper for the same output) and the amount of time Fable gets stuck overthinking things are reduced to the places where I think that model makes sense, for the rest it started fanning out a lot to Opus, Sonnet and even Haiku.
  • kingkongjaffa 3mo ago
    How does it change model mid conversation? Does it spawn sub agents with different models or is it the same single conversation dynamically switching models?
    • theptip 3mo ago
      Yes, sub-agents I believe. You need to pay to reload context if you switch the main conversation model effort.
    • Huppie 3mo ago
      Subagents indeed. This [0] was the post I was referencing, and here's the original suggested prompt: > For all coding tasks use your judgement to decide an appropriate lower power model and run that in a subagent As said, I tweaked it a little bit to my preference (mostly because it started delegating a bit too much) and had it placed in my global claude.md but that's the gist. [0] https://simonwillison.net/2026/Jul/3/judgement/ https://simonwillison.net/2026/Jul/3/judgement/