Claude Opus 4.1: Decoding the Strategic Impact of Anthropic’s Latest Model Upgrade

Claude Opus 4.1 Is in Internal Testing: What a “Minor” Version Bump Really Means Last updated: 5 August 2025 Reading time: ~15 min Quick takeaway Anthropic has quietly added a new internal model tag—“claude-leopard-v2-02-prod”—to its configuration files, paired with the public-facing name Claude Opus 4.1. A new safety stack, Neptune v4, is undergoing red-team testing. If the past is any guide, the public release could land within one to two weeks. No new pricing, no new API endpoints—just (potentially) better reasoning. 1. Why a “.1” Release Still Deserves Your Attention When most software jumps from 4.0 to 4.1, we expect …