Claude Sonnet 5 pricing rises 50% on September 1 — update your cost models now

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Anthropic's introductory pricing for Claude Sonnet 5 expires on August 31, 2026, after which input costs rise from $2 to $3 and output costs from $10 to $15 per million tokens — a 50% increase. Developers who hardcoded introductory rates into session budgets, routing logic, or cost estimates will see those figures become inaccurate overnight. Unlike gradual pricing drift, this is a scheduled snap change on a known date, making it easier to prepare for but easy to overlook if no expiry tracking is in place. Engineers are advised to add expiration metadata to pricing registries and surface alerts via startup logs, Slack, or CI checks before the deadline. DeepSeek has also announced a pending price increase for V4-Flash and V4-Pro with no confirmed date, adding further uncertainty for teams relying on multiple AI providers.

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