models•confirmed Confidence•Importance 4/5
Claude Sonnet 5 narrows the agentic capability and cost gap
Anthropic launched Sonnet 5 with stronger tool use, coding, reasoning, and configurable effort at a lower tier than Opus.
Occurred: 2026-06-30Published: 2026-06-30Verified: 2026-07-17current
Why it matters
Agent architects can trade effort and token cost within one model family, but must remeasure tokenization and workflow economics.