Anthropic makes Claude Sonnet 5's introductory pricing permanent at $2/1M input tokens and $10/1M output tokens, canceling a planned September 1 increase (Claude/@claudeai)

Anthropic announced that the introductory pricing for its Claude Sonnet 5 model will remain in effect indefinitely. The company had previously signaled a price rise to take effect on September 1, but that change has been withdrawn. This means the token-based cost structure stays exactly as it was when the model launched.

For developers who have integrated Claude Sonnet 5 via the API, the cost per million input tokens stays at $2 and per million output tokens at $10. Existing budgeting and cost-tracking tools can keep using the same figures, avoiding the need to re-estimate expenses for upcoming releases. No additional fees or hidden charges are introduced by this announcement.

The permanent pricing applies solely to Claude Sonnet 5; Anthropic’s other offerings retain their own pricing schemes. If an application switches to a different model, engineers must still consult the relevant rate tables. Consequently, code that abstracts model selection should continue to handle price differences explicitly.

By cancelling the September 1 increase, Anthropic eliminates a potential cost shock for services that rely heavily on Claude Sonnet 5. This simplifies long-term financial planning for teams that run large-scale token workloads, as they can now assume a stable per-token cost for the foreseeable future. The stability also aids in negotiating contracts or setting service-level agreements that reference token pricing.

The announcement does not guarantee further price reductions or discounts beyond the stated rates. Projects that anticipate lower costs through future promotions will need to treat this as a baseline rather than a minimum. Additionally, because pricing is token-based, unusually long output sequences can still generate significant charges despite the stable per-token rates.