Claude Sonnet 4.5
legacyAnthropic · Released Sep 2025
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- Superseded by Sonnet 4.6 at identical pricing.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
Price history
Snapshots
| Effective | Input | Output | Cached in | Note | Source |
|---|---|---|---|---|---|
| 29 Sep 2025 | $3.00 | $15.00 | $0.3 | anthropic.com/pricing |