Anthropic ships Claude Sonnet 5.5 at $2 per million tokens

The latest:

Anthropic released Claude Sonnet 5.5 on Monday at $2 per million input tokens and $10 per million output tokens, unchanged from Sonnet 5, according to Reuters. The company positioned it as the faster, lower-cost complement to Claude Opus 5.5, launched a week earlier. It is the lab’s second model release as it expands its product lineup ahead of a planned initial public offering.

Details:

• The pricing: Sonnet 5.5 carries the same rates as its predecessor — $2 per million input tokens and $10 per million output tokens. Anthropic said the model needs fewer tokens to complete the same work, an efficiency claim that would lower effective cost per task without a headline price cut.
• The lineup: Anthropic framed Sonnet 5.5 as the cheaper, quicker counterpart to Claude Opus 5.5, which arrived last week at $4 per million input tokens and $20 per million output tokens. That puts Opus at double the input rate and twice the output rate of the new mid-tier model.
• Still coming: A third model, Haiku 5.5, built for fast, high-volume work, is due soon, the company said. Anthropic did not give a release date, leaving the completion of the Claude 5.5 family without a public timeline.
• Target use cases: The company said Sonnet 5.5 suits everyday enterprise tasks — coding, document creation and spreadsheet work — rather than the frontier reasoning workloads that typically justify Opus-tier pricing.
• The customer base: Enterprise clients account for roughly 80% of Anthropic’s business, according to the company, with named customers including Salesforce, Databricks, Goldman Sachs and Novo Nordisk. The remaining share of revenue was not broken out.
• The IPO backdrop: Reuters reported the release comes as the lab builds toward a planned public listing. Anthropic has not disclosed a filing date, a target valuation or a bank syndicate, and the expanding model tier structure is the clearest public signal of how it is positioning revenue.
• The safety tension: Chief executive Dario Amodei called on the global AI community earlier this month to slow the pace of releasing new capabilities to address safety concerns, per Reuters. The Sonnet 5.5 launch is Anthropic’s second release since those remarks.

Background:

Anthropic splits Claude into tiers: Opus for the heaviest reasoning, Sonnet as the mid-range workhorse, and Haiku for high-volume, low-latency tasks. The 5.5 generation is being rolled out tier by tier rather than all at once.

Between the lines:

Holding Sonnet’s price flat while claiming lower token consumption lets Anthropic advertise cheaper work without cutting listed rates — a margin-friendly move for a company whose revenue is roughly 80% enterprise and which is preparing to sell its story to public investors. The gap between Amodei’s call to slow capability releases and two launches in eight days is the tension a listing prospectus would have to address.

What’s next

Watch for the Haiku 5.5 release and any date attached to it, plus Anthropic’s first formal IPO filing, which would disclose revenue, valuation target and underwriters for the first time.