Claude Sonnet 4.5
DeprecatedConvenience alias resolving to the most recent dated snapshot for this minor version.
Access details: Anthropic API
An alias. The provider can point it at a newer version.
claude-sonnet-4-5Updated Sep 23, 2026
Capabilities & limits
- Context window
- 200K
- Maximum output
- 64K
- Image input
- Supported
- Tool calling
- Supported
- Structured output
- Supported
Pricing
USD / 1M tokens- Input
- $3.00
- Output
- $15.00
Standard rates per million tokens. Discounts and long-context rates, where offered, are on Anthropic's pricing page.
Full rate card 5 rates
All prices in USD.
Base input tokens
$3.00 per 1M tokens- Claude API global standard
Output tokens
$15.00 per 1M tokens- Claude API global standard
Cache hits and refreshes
$0.30 per 1M tokens- prompt caching
5 minute cache writes
$3.75 per 1M tokens- prompt caching
- 5 minute duration
1 hour cache writes
$6.00 per 1M tokens- prompt caching
- 1 hour duration
Alias of claude-sonnet-4-5-20250929; billed at that snapshot's rates. Batch API is 50% off ($1.50 input / $7.50 output per MTok).
Price history
Sep 23, 2026
Input $3.00 per million tokens
Sep 23, 2026
Output $15.00 per million tokens
Technical details
- Parameters
- Not published
- Active parameters
- Not published
- Architecture
- Not published
- Training / knowledge cutoff
- Jul 2025
- Input modalities
- Text, image
- Output modalities
- Text
From Anthropic
Official announcement ↗Release & lifecycle
- First available
- Sep 29, 2025
- available
- As of Sep 23, 2026
- deprecated
- As of Oct 20, 2026