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Claude Sonnet 5 launched at $2 input / $10 output per 1M tokens through August 31, 2026. Standard pricing becomes $3/$15 on September 1.
Model budgets must account for the September 1 price change and an updated tokenizer that can produce more tokens for equivalent text.
| Field | Before | After |
|---|---|---|
| model | claude-sonnet-4-6 | claude-sonnet-5 |
| intro_pricing | — | 2, 10 |
| standard_pricing | — | 3, 15 |
| standard_effective | — | 2026-09-01 |
Anthropic launched Sonnet 5 at introductory $2/$10 pricing through August 31, then $3/$15.
Check your models and usage for free. See the relevant official changes, estimated cost, and a practical next step.