OpenAI is retiring o3 and GPT-4.5 from ChatGPT to focus on newer models.

The removal of these models forces a transition to the current frontier for all non-API workflows.

Operators must migrate custom instructions and saved prompts to newer models before the sunset dates to maintain performance.

• Jun 06, 2026Anthropic updated prompt caching to automatically read from the longest previously cached prefix when breakpoints are set.
• Jun 06, 2026Anthropic optimized prompt caching support in the Message Batches API to improve cache hit rates.
• Jun 06, 2026Anthropic added a delete endpoint to the Message Batches API for managing batch processing tasks.

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