# Opus 4.6

- [Anthropic's Silent 'Effort' Default: A Reasonable Decision, a Transparency Failure](https://sdd.sh/2026/04/anthropics-silent-effort-default-a-reasonable-decision-a-transparency-failure.md): On March 3, Anthropic quietly changed Claude Opus 4.6's default effort level to 'medium' without telling users. An AMD executive's analysis of 6,852 sessions showed a 73% drop in visible thinking depth. Fortune, VentureBeat, and The Register covered the fallout. Here is what actually changed, why Anthropic did it, and what it means for developers who depend on Claude Code for serious work.
- [Claude's 1M Context Window Is Now Standard: What Actually Changes for Agentic Coding](https://sdd.sh/2026/04/claudes-1m-context-window-is-now-standard-what-actually-changes-for-agentic-coding.md): On March 13, Anthropic made the 1M token context window standard on Sonnet 4.6 and Opus 4.6 — no beta header, no pricing premium above 200K. Here is what that actually changes for coding agents, how it compares to the competition, and what it still cannot solve.