Models2026-06-07 · source-backed

Opus 4.1 deprecation clock started June 5.

Issue

2026-06-07

Confidence

source-backed

Sources

Redaction

passed

Story

Anthropic notified developers that claude-opus-4-1-20250805 retires from the API August 5, recommending migration to Opus 4.8. Source: Claude API Docs Routine lifecycle management, but a two-month countdown if you've pinned 4.1 in production. The broader lesson stands: hard-coded model strings are technical debt now that the release cadence is this fast. The Sonnet 4 / Opus 4 retirement set is June 15.

Opus built by Anthropic / Shared entities / Same source domain / Shared topic / What happened next
Anthropic's August calendar breaks or re-prices four things.
Linked by a graph relationship (Opus built by Anthropic); both cover Anthropic, Opus; reported by the same outlet (platform.claude.com).
Claude Opus 4.1 is fully retired. Requests to `claude-opus-4-1-20250805` error out.
Linked by a graph relationship (Opus built by Anthropic); both cover Anthropic, Opus; reported by the same outlet (platform.claude.com).
Claude Code raises default subagent nesting depth to 3
Linked by a graph relationship (Opus built by Anthropic); both cover Anthropic, Opus; reported by the same outlet (platform.claude.com).
Anthropic released Mythos / Shared entities / Shared topic / What happened next / Tension
Your model is an upstream dependency you don't control. Plan accordingly.
Linked by a graph relationship (Anthropic released Mythos); both cover Anthropic, Opus; overlapping topics (anthropic, opus).
Opus built by Anthropic / Shared entities / Shared topic / Earlier coverage / Tension
Anthropic Ships the Advisor Tool: Tiered Cognition Is Now a First-Class API Pattern
Linked by a graph relationship (Opus built by Anthropic); both cover Anthropic, Opus; overlapping topics (anthropic, opus).
Claude Opus built by Anthropic / Shared entities / Shared topic / Earlier coverage / Tension
Anthropic Published Their Multi-Agent Architecture Playbook. The $9 vs $200 Gap Is the Whole Lesson.
Linked by a graph relationship (Claude Opus built by Anthropic); both cover Anthropic, Opus; overlapping topics (anthropic, opus).
Anthropic released Claude / Shared entities / Shared topic / What happened next
Anthropic Ships Claude Opus 5. Double the Bench, Half the Price, and an 87-Minute Outage to Match
Linked by a graph relationship (Anthropic released Claude); both cover Anthropic, Opus; overlapping topics (anthropic, opus).
Anthropic supports Claude Cowork / Shared entities / Shared topic / What happened next
Opus 5 cuts prompt injection success rate to 2%
Linked by a graph relationship (Anthropic supports Claude Cowork); both cover Anthropic, Opus; overlapping topics (anthropic, opus).

Source trail

Source: Claude API Docs

Entities

Anthropic API August Claude API Docs Opus Routine

Provenance

Canonical issue: Ramsay Research Agent — June 7, 2026
AI generated: no
Story unit: 2026-06-07-opus-4-1-deprecation-clock-started-june-5
Labels: source-backed, canonical briefing excerpt

Fetching from the wire…

Opus 4.1 deprecation clock started June 5.

Story

Related stories

Anthropic's August calendar breaks or re-prices four things.

Claude Opus 4.1 is fully retired. Requests to `claude-opus-4-1-20250805` error out.

Claude Code raises default subagent nesting depth to 3

Your model is an upstream dependency you don't control. Plan accordingly.

Anthropic Ships the Advisor Tool: Tiered Cognition Is Now a First-Class API Pattern

Anthropic Published Their Multi-Agent Architecture Playbook. The $9 vs $200 Gap Is the Whole Lesson.

Anthropic Ships Claude Opus 5. Double the Bench, Half the Price, and an 87-Minute Outage to Match

Opus 5 cuts prompt injection success rate to 2%

Source trail

Entities

Provenance

Opus 4.1 deprecation clock started June 5.

Story

Related stories

Anthropic's August calendar breaks or re-prices four things.

Claude Opus 4.1 is fully retired. Requests to `claude-opus-4-1-20250805` error out.

Claude Code raises default subagent nesting depth to 3

Your model is an upstream dependency you don't control. Plan accordingly.

Anthropic Ships the Advisor Tool: Tiered Cognition Is Now a First-Class API Pattern

Anthropic Published Their Multi-Agent Architecture Playbook. The $9 vs $200 Gap Is the Whole Lesson.

Anthropic Ships Claude Opus 5. Double the Bench, Half the Price, and an 87-Minute Outage to Match

Opus 5 cuts prompt injection success rate to 2%

Source trail

Entities

Provenance