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Anthropic releases Claude Sonnet 5, built for autonomous agent work

See how this story connects

Source: Anthropic: Introducing Claude Sonnet 5

Anthropic released Claude Sonnet 5, which it described as the most agentic Sonnet model yet, able to plan, use tools such as browsers and terminals and run autonomously at a level that earlier required larger models. It became the default for Free and Pro plans and costs $2 and $10 per million input and output tokens.

Why it matters

Free Claude users and developers got agent-grade capability at a lower Sonnet price than Sonnet 4.6’s $3 and $15.

When
30 Jun 2026
ID
WTA-N-2026-0172
Who
Anthropic

Summary by wheresthe.ai, from Anthropic. Checked against the source on 9 Oct 2026.

Read the original at Anthropic

Source copy: download the page as saved on 18 Oct 2026 (PDF). Document the source offers: document 1 (PDF). Also held by the Internet Archive.

Earlier in this Storyline: What led hereAnthropic releases Claude Sonnet 4.6 as the default for free users

Cite this story

WTA-N-2026-0172: “Anthropic releases Claude Sonnet 5, built for autonomous agent work.” wheresthe.ai, 30 Jun 2026. https://wheresthe.ai/d/anthropic-claude-sonnet-5-release-2026-06/ (source: Anthropic: Introducing Claude Sonnet 5).

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