Daily AI Builder Brief - April 20, 2026

Executive Summary

Claude Haiku 3 (claude-3-haiku-20240307) hits its tentative retirement date today. API requests to that model ID will start failing. Migration target is claude-haiku-4-5-20251001.
No Claude Code release on Apr 19 or Apr 20. 2.1.114 (Apr 18, one Agent Teams permission fix) is still the head.
No new Anthropic news posts since Apr 17 (Claude Design). Opus 4.7 and Claude Design are still the live shifts.
MCP upstream silent since the Apr 8 maintainer post. No spec revision, no new official server, no new blog post in the window.
Nothing in broader AI crossed the bar for builder impact in the 24 to 48 hour window.
If you're still on Opus 4 or Sonnet 4 (*-20250514), the clock is real: both retire June 15, 2026.

Claude Code

Apr 19 and Apr 20: no release

Head is still 2.1.114 from Apr 18. Your audit target is still 2.1.113: the native binary cutover, sandbox.network.deniedDomains, tighter find -exec and wrapper-command matching. (changelog)

Anthropic

Claude Haiku 3 retires today

Per the official model deprecations page, claude-3-haiku-20240307 has a tentative retirement date of April 20, 2026. After that, requests fail, there's no automatic fallback. Replacement is claude-haiku-4-5-20251001 (same 200K context, output jumps from 4K to 64K, Extended Thinking support, $1 / $5 per million tokens). If you haven't swept your codebase and audited API usage in Console yet, do it today. (deprecations)

Nothing else in the window

No news posts since Apr 17. (news)

MCP Ecosystem

Still quiet

No new post on the MCP blog since the Apr 8 maintainer update (Den Delimarsky as Lead Maintainer, Clare Liguori on Core). 2026 roadmap items (stateless Streamable HTTP, .well-known capability metadata, enterprise auth) are still the direction, not this week's shipping reality. (blog, roadmap)

Broader AI

Nothing today.

What This Means For Builders

Grep your code for claude-3-haiku-20240307 right now. Any callsite still on that ID is a production incident waiting for the next invocation.
While you're in there, note Opus 4 and Sonnet 4 (*-20250514) both retire June 15. Put the migration ticket in this sprint, not Q3.
Still a quiet window on shipping surface: finish the 2.1.113 permission and sandbox audit before the next Claude Code drop.
Haiku 4.5 at $1 in / $5 out is the new default for cost-sensitive inference. If your app still routes cheap traffic to a deprecated model because you never re-benchmarked, today's the forcing function.