Anthropic launched Claude Sonnet 5, its mid-tier model, on June 30, 2026. Sonnet 5 replaces the previous Sonnet 4.6 and lands close to Anthropic's top model Opus 4.8 in performance while costing far less. Its introductory pricing, in effect through August 31, 2026, is $2 per million input tokens and $10 per million output tokens. ASAP summarizes it from Anthropic's official announcement and primary reporting by AWS and TechCrunch.

What was launched

What Anthropic launched is Claude Sonnet 5, a new mid-tier model in the Sonnet line that clearly upgrades the previous flagship, Sonnet 4.6. Anthropic says Sonnet 5 shows substantial improvement over its predecessor on core agentic capabilities such as reasoning, tool use, coding, and knowledge work. On Amazon Bedrock it is callable from launch day under the model ID us.anthropic.claude-sonnet-5.

How is it priced

Sonnet 5 carries introductory pricing of $2 per million input tokens and $10 per million output tokens through August 31, 2026. After the introductory period it moves to standard pricing of $3 per million input tokens and $15 per million output tokens. VentureBeat framed this as a steep discount relative to Anthropic's top model, an aggressive pricing move made as the company races toward a blockbuster IPO.

How far has performance come

Sonnet 5's performance is close to that of the top model Opus 4.8 while staying at a lower price, according to Anthropic. The company says Sonnet 5 lowers hallucination and sycophancy rates and improves safety metrics measured in behavioral audits. Specific benchmark figures are detailed separately in the Claude Sonnet 5 System Card, while the announcement presents comparison numbers only as a table image.

What it means

Sonnet 5's launch shows Anthropic extending the performance race into a price race. Pulling Opus 4.8-class intelligence down to Sonnet-tier pricing directly cuts token costs for enterprise customers that run agents at scale in repeated loops. As automation workloads that were too expensive on the top model shift down to a mid-tier model, the deciding factor moves from absolute performance to cost-performance.

Summary

Claude Sonnet 5 is a mid-tier model that brings near-Opus 4.8 performance down to Sonnet-tier pricing. Its aggressive $2-per-million-input-token introductory price signals that Anthropic, ahead of an IPO, is aiming squarely at the cost axis of the market for running agents at scale.

Source: Anthropic official announcement (2026-06-30, "Introducing Claude Sonnet 5"), reporting by AWS, TechCrunch, and VentureBeat.