Haiku 5.5: Your Claude Code Agents Don't All Need Opus

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Opus on every agent — does the job need it, or did the file search just inherit the builder's config?
Haiku 5.5 makes that default worth questioning, without handing the whole app to a smaller model.

I'm reacting to Anthropic's Claude Haiku 5.5 announcement and its arrival in Claude Code, looking at where I'd try a smaller model around the builder — repo exploration, tracing call sites, gathering context and summarizing diffs — while keeping architecture, ambiguous bugs and the hairy SwiftUI implementation on the strong model.

The part I care about isn't just the price per token, it's what comes back from the subagent, what the builder has to check, and whether retries and rework eat the saving we thought we'd made. We look at the pricing threshold, tokenizer change and the distinction between the default Haiku model and the model our main session actually runs.

This is an announcement-led reaction and a where-I'd-start, not a hands-on Haiku review, benchmark showdown or claim that I've tested this split.

Crafter's Lab is a living workshop around a real app studio, where we build the systems that build our apps — not a course.
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CHAPTERS
0:00 Does every agent really need Opus?
0:13 The config the file search inherited
1:57 The studio behind the app
2:31 Cheap tokens, expensive rework
4:22 A nice summary isn't proof
6:16 Keep the builder, question the default
6:51 Build the system, not another prompt

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ANNOUNCEMENT AND RESOURCES
Claude Haiku 5.5 announcement
https://www.anthropic.com/claude-haiku-5-5

Claude Code changelog
https://code.claude.com/docs/en/changelog

Haiku migration guide — recount tokens
https://platform.claude.com/docs/en/models/haiku-5-5/migration-guide#recount-tokens

Claude Code — built-in subagents and Explore
https://code.claude.com/docs/en/sub-agents#built-in-subagents

Claude Code — choose a subagent model
https://code.claude.com/docs/en/sub-agents#choose-a-model

Claude Code — main-session model configuration
https://code.claude.com/docs/en/model-config#setting-your-model

Claude support — API-credit details
https://support.claude.com/en/articles/17154008

TypeSafe — Jev / System One Models
https://typesafe.ai/blog/introducing-system-one-models-and-jev

#ClaudeCode #Haiku55 #AIAgents #AgenticEngineering #SoloDev

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