Breaking

Developers Promote Tiered Claude Code Workflow With Opus 5.5, Sonnet 5.5, Fable 5.1 and Jev

October 7, 2026 at 16:56 EDT

Software Dev & Coding
AI Agents
Foundation Models

A new Claude Code workflow is drawing attention among AI developers for splitting coding-agent work across multiple models: Claude Opus 5.5 stays in the main session, Claude Sonnet 5.5 handles routine execution through subagents, Claude Fable 5.1 is kept for high-judgment review, and TypeSafe's Jev makes bounded routing decisions. The setup is not a single Anthropic product release; it is a layered pattern built from documented Claude Code features and third-party Jev integrations.

October 2026 · Claude Code workflow

Premium Models, Narrower Jobs

The emerging stack keeps Opus on the main build, delegates routine work to Sonnet, calls Fable for high-judgment review, and uses Jev for bounded routing decisions.

Opus 5.5 input per MTok

Sonnet 5.5 input per MTok

$10

Fable 5.1 input per MTok

70-500 ms

Jev decision latency

Input price comparison

Sonnet 5.5

Opus 5.5

$10

Fable 5.1

Each block represents $1 per million input tokens.

Role-based agent loop

Opus 5.5
Main build and judgment

→

Sonnet 5.5
Bounded execution

→

Fable 5.1
Advisor-level review

→

Jev
Typed routing choices

Why developers like it

Expensive reasoning is reserved for planning, escalation, and review while routine reads, edits, and checks move to cheaper workers.

What still needs care

Advisor calls add token spend, subagents still consume context, and Jev routing remains an added integration layer rather than a single built-in switch.

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