Anthropic Launches Claude Sonnet 5 With Discounted Pricing, but Analysts Warn Per-Task Costs May Erode the Savings

Anthropic released Claude Sonnet 5 on June 30, 2026, positioning it as its most agentic mid-tier model and making it the default for free and paid users—but early analysis suggests its headline discount may not translate into lower real-world costs once a promotional pricing window closes. The model slots between the flagship Opus 4.8 and the outgoing Sonnet 4.6, and Anthropic is pitching it as delivering near-flagship capability at a fraction of the price.