Claude Sonnet 5 Pricing: Anthropic Makes $2/$10 Permanent, Cancels September Increase
If you budgeted for a Claude Sonnet 5 price rise on September 1, you can put the money back. Anthropic has quietly made Sonnet 5’s $2 per million input tokens / $10 per million output tokens pricing permanent. The company’s pricing documentation now states that the rate, “announced at launch as introductory pricing through August 31, 2026, is now the standard price,” and that “the previously scheduled increase to $3/$15 per million input/output tokens on September 1, 2026 will not occur.”
Claude Sonnet 5 Pricing at a Glance
| Rate | Input | Output |
|---|---|---|
| Standard (permanent) | $2 / MTok | $10 / MTok |
| Batch API (50% off) | $1 / MTok | $5 / MTok |
| Prompt cache write (5 min) | $2.50 / MTok | — |
| Prompt cache write (1 hour) | $4 / MTok | — |
| Prompt cache read | $0.20 / MTok | — |
| Cancelled Sept 1 increase |
The full 1M-token context window is included at standard pricing — a 900k-token request costs the same per token as a 9k-token one. Run your own numbers in the Claude API cost estimator.
Why This Matters
- Sonnet 5 stays a third cheaper than Sonnet 4.6 ($3/$15), despite being the stronger model — a rare case of a successor costing less.
- The gap to Opus widens. Claude Opus 5 costs $5/$25, so Sonnet 5 is now 2.5× cheaper per token, not 1.67×, which strengthens the case for defaulting to Sonnet 5 and escalating to Opus only when a task demands it.
- Budgets set on the old schedule are over-provisioned. Teams that planned for $3/$15 from September can cut their Sonnet 5 line by a third.
For how Sonnet 5 fits the rest of the lineup, see Claude Models Explained, and use the model selector to check whether Sonnet 5 is the right pick for your workload.
Frequently Asked Questions
Did Claude Sonnet 5’s price increase on September 1, 2026?
No. Anthropic cancelled the scheduled increase. Its pricing documentation states that the $2/$10 per million token rate is now the standard price and the rise to $3/$15 will not occur.
What does Claude Sonnet 5 cost?
Claude Sonnet 5 costs $2 per million input tokens and $10 per million output tokens on the Claude API. Batch API requests are 50% off ($1/$5), and prompt cache reads cost $0.20 per million tokens.
Is Claude Sonnet 5 cheaper than Sonnet 4.6?
Yes. Sonnet 5 is $2/$10 per million tokens versus $3/$15 for Sonnet 4.6 — about a third cheaper, while also being the more capable model.