Claude Sonnet 4.5
legacyAnthropic · Mid
Previous Sonnet generation. Same $3 / $15 pricing as 4.6 — Sonnet pricing has held flat.
- Strengths
- Capable mid-tier Sonnet at the durable Sonnet price.
- Best for
- General-purpose work where the newest Sonnet isn't essential.
- Limitations
- Superseded by Sonnet 4.6 at identical pricing.
Input / 1M
$3.00
Output / 1M
$15.00
Cached input / 1M
$0.3
Context window
1M
Where it sits
250th-cheapest mid model
by blended $/Mtok among 262 listed mid models
950% above the mid median
blended $/Mtok across 262 mid models
Output costs 5× input
$3.00 in / $15.00 out per 1M
Cached input saves 90%
$0.3 vs $3.00 per 1M fresh
Held flat since launch (Sep 2025)
no blended price change recorded
Computed live from current prices and this model's history — not hand-written, so it stays accurate as prices move.
Price history
Only one price on record so far — the history chart appears once a price changes.
Snapshots
| Effective | Input | Output | Cached in | Note | Source |
|---|---|---|---|---|---|
| 29 Sep 2025 | $3.00 | $15.00 | $0.3 | anthropic.com/pricing |