Anthropic deprecated Claude Sonnet 4 and Claude Opus 4, with Claude API retirement on June 15, 2026.

API users need migration work now because the named models have a posted retirement path.

This sits in model deprecations, moving builders from deprecated Sonnet and Opus IDs to recommended replacements.

• Jul 27, 2026Frontier vendors expanded runtime surfaces while removing public plan and model-routing signals.
• Jul 26, 2026OpenAI updated GPT-5.5 Instant to improve conversational quality in decision, advice, planning, research, and shopping tasks.
• Jul 25, 2026Enterprise and Edu users can find skills under Plugins, on the Skills tab in the Plugin Directory.

This is the world we build in. It moves this fast. We move with it.