Claude Sonnet 5 price increase: announced for September 1, 2026, then cancelled
It did not happen. Anthropic published a 50% increase for Claude Sonnet 5, from $2 / $10 to $3 / $15 per million input and output tokens, scheduled for 2026-09-01, then withdrew it before it took effect. Sonnet 5 still costs $2 input and $10 output, and that is now the standard price rather than an introductory one. Read on Anthropic's pricing page on 2026-09-04. The published rate never moved.
The $2/$10 per million input/output token pricing for Claude Sonnet 5, announced at launch as introductory pricing through August 31, 2026, is now the standard price. The previously scheduled increase to $3/$15 per million input/output tokens on September 1, 2026 will not occur.
What you pay, and what was scheduled
| Per 1M tokens | What you pay | Was scheduled | Outcome |
|---|---|---|---|
| Input | $2 | $3 | cancelled |
| Output | $10 | $15 | cancelled |
| Cache read | $0.20 | $0.30 | cancelled |
| Cache write (5 min) | $2.50 | $3.75 | cancelled |
| Cache write (1 hour) | $4 | $6 | cancelled |
| Batch input | $1 | $1.50 | cancelled |
| Batch output | $5 | $7.50 | cancelled |
The scheduled move was one multiplier across the whole card, so every line item would have risen by the same 50%. The "what you pay" column is read from the AI Price Index snapshot this site ships, not typed into the page, so it cannot drift from the dataset.
What the increase would have cost you
Enter a month of Sonnet 5 usage in millions of tokens. Everything computes in your browser.
What you pay
$38.40/mo
Had it gone ahead
$57.60/mo
Increase avoided
$19.20/mo
Cache writes are left out to keep the inputs simple; they would have moved by the same 50%, so the percentage holds for any mix and only the absolute dollars shift.
The dated record
Announced price changes that get cancelled tend to vanish. The announcement is edited away, the coverage keeps the old headline, and a year later there is no way to establish what was scheduled or when it was withdrawn. This is that record.
- At launch. Sonnet 5 ships at $2 / $10, published as introductory pricing through 2026-08-31, with $3 / $15 named as the standard rate to follow.
- 2026-09-01. The date the increase was scheduled for. It did not take effect. The published rate did not move.
- 2026-09-02. The AI Price Index records the cancellation from Anthropic's own page and holds the $2 / $10 interval open with no end date, rather than closing it on 2026-08-31 as the original announcement implied.
- 2026-09-04. Cancellation note re-read first-party and quoted above.
Every Sonnet 5 rate on this page is dated and sourced in the AI Price Index, which keeps the interval history rather than only the current number.
What the cancellation changes
No expiry to plan around
The numbers did not change, but their label did. An introductory rate carries an end date and forces a decision before it. Anthropic now calls the same $2 / $10 the standard price, with no published date on which it rises.
Budgets built on the rise are wrong
Any September forecast that priced Sonnet 5 at $3 / $15 overstates spend by 50% on every metered token. That includes plans made from the original announcement, which was accurate when it was published.
Against the alternatives
- Claude Sonnet 4.6 lists $3 / $15, so Sonnet 5 stays the cheaper sticker of the two. The cancelled rate was exactly Sonnet 4.6's, which is what would have erased the gap. One caveat that survives the cancellation: per Anthropic, Sonnet 5 uses a newer tokenizer that produces roughly 30% more tokens for the same text, so a lower sticker does not guarantee a lower bill for identical work.
- Claude Haiku 4.5 stays at $1 / $5, half the Sonnet 5 rate, and was never part of this change.
- GitHub Copilot meters Claude Sonnet 5 in AI credits on its own rate card, which moves independently of the Claude API list price. Details on the Claude Sonnet 5 in Copilot page.
- Current list rates for every major provider, dated and sourced, live in the AI Price Index.
The Goei dashboard prices usage at the rate that was live on the day it ran, so a cancelled increase never retroactively rewrites what a past session cost. How that works: re-priced history.
FAQ
- Did the Claude Sonnet 5 price increase happen on September 1, 2026?
- No. Anthropic cancelled it. The pricing page states that the $2/$10 per million input/output token rate, announced at launch as introductory pricing through 2026-08-31, is now the standard price, and that the scheduled increase to $3/$15 on September 1, 2026 will not occur.
- How much does Claude Sonnet 5 cost now?
- $2 per million input tokens and $10 per million output tokens on the Claude API, with cache reads at $0.20, 5-minute cache writes at $2.50, 1-hour cache writes at $4, and batch processing at half the base rates. This is the standard price, not a promotion, and it has no published end date.
- Was there ever really an increase scheduled?
- Yes. Sonnet 5 launched with $2/$10 labelled introductory pricing through 2026-08-31, and Anthropic published $3/$15 as the standard rate to follow on 2026-09-01. That is why the increase was widely reported. It was withdrawn before its effective date, and the published rate never moved off $2/$10.
- Is the current rate still called introductory pricing?
- No. That is the substance of the change. An introductory rate carries an expiry and invites you to plan around it. Anthropic now describes the same numbers as the standard price, so there is no published date on which Sonnet 5 gets more expensive.
- Does this affect Claude Pro or Claude Max subscriptions?
- No. Subscription plan prices are set separately and were never part of this change, which applied only to API metering: pay-as-you-go usage, BYOK setups, and anything else billed per token at list rates.