Claude Sonnet 5 Launches as Anthropic's Balanced Summer Tier

Anthropic has launched Claude Sonnet 5, the balanced tier of its summer lineup, priced at $2 per million input tokens and $10 per million output tokens — bringing 5-series capability to mid-range budgets.

Claude Sonnet 5 Launches as Anthropic's Balanced Summer Tier

Anthropic has launched Claude Sonnet 5, the first of its 5-series models to reach general availability this summer. Priced at $2 per million input tokens and $10 per million output tokens, Sonnet 5 slots into the middle of the Claude lineup — below the flagship Opus tier and above the economical Haiku 4.5 at $1/$5.

The positioning is deliberate. The Sonnet line has always been Anthropic's workhorse: capable enough for serious coding and long-form work, cheap enough to run at production volume. Early adopters report the 5-generation continues that pattern, with gains concentrated in multi-step reasoning and tool use — the skills that matter for the agent frameworks enterprises are increasingly building on.

The launch also sets the stage for a broader summer refresh. Anthropic's previous-generation Sonnet 4 and Opus 4 remain available for now, but with a 5-series rollout underway, teams still pinned to the 4-series should start planning migrations rather than waiting for an announcement.

For buyers, the more interesting signal is structural. With Google's Gemini 3 family installed at scale since last autumn and open-weight alternatives improving monthly, the mid-tier market — where most production traffic actually lives — has become the most competitive segment in AI. Sonnet 5's pricing reads as Anthropic defending exactly that ground.

Our take: evaluate Sonnet 5 against your current mid-tier workload this month. The balanced tier is where price-performance battles are won, and the summer release calendar suggests it will stay eventful.