Claude Opus 4.7: What Actually Changed for Agentic Coding

Anthropic shipped Opus 4.7 on April 16, 2026. Same $5/$25 pricing as 4.6. Same 1M context. Same 128K output ceiling. Different model entirely when you put it in an agentic coding loop. If you run Claude Code or build agent pipelines on the Claude API, this post is the migration brief I wish someone had handed me on release day. Benchmarks, the five behavioral shifts that actually matter, the new API features, and the breaking changes you will hit if you just flip the model ID.