DataCamp analysis of Claude Sonnet 5 (June 30, 2026): most agentic Sonnet yet; replaces Sonnet 4.6 (February 2026). Uses updated tokenizer producing ~30% more tokens for same text vs Sonnet 4.6 — affects billing.
API model name: claude-sonnet-5. Intro pricing 10 per million tokens through August 31, 2026; standard 15 after. Available Free/Pro default, Max/Team/Enterprise, Claude Code, Claude Platform.
Key capability: agentic coding, tool use, browser work, professional tasks at Sonnet-class pricing approaching Opus performance.