◉CLAUDE LABJP
●2.1.296 — Subagents can set their own autoCompactWindow, and an env var pins the model used by workflow agents●AGENTS — Managed Agents gain dynamic workflows in beta: an agent can build a run for work with many pieces (Oct 9)●SONNET 4.5 — Retires on the Claude API on 11/30, 50 days left. Migrate to Sonnet 5.5●Q&A — A long-running report: Max plan users hit usage limits almost immediately●HAIKU 5.5 — Code written for Haiku 4.5 hits a 400 error on budget_tokens●NEW — Before you cut an always-loaded instruction file in half, sort it into three drawers●2.1.296 — Subagents can set their own autoCompactWindow, and an env var pins the model used by workflow agents●AGENTS — Managed Agents gain dynamic workflows in beta: an agent can build a run for work with many pieces (Oct 9)●SONNET 4.5 — Retires on the Claude API on 11/30, 50 days left. Migrate to Sonnet 5.5●Q&A — A long-running report: Max plan users hit usage limits almost immediately●HAIKU 5.5 — Code written for Haiku 4.5 hits a 400 error on budget_tokens●NEW — Before you cut an always-loaded instruction file in half, sort it into three drawers
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model-routing

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⬡ API & SDK/2026-04-12Advanced

Intelligent Model Routing with Claude API — Auto-Selecting Sonnet 4.6 and Haiku 4.5 for Optimal Cost and Quality

Build an intelligent routing layer that automatically selects between Claude Sonnet 4.6 and Haiku 4.5 based on request complexity. Covers classifier design, circuit breakers, fallback chains, and cost monitoring for production deployments.