Claude Sonnet 5.5
AvailableAn Anthropic model with a 1M-token context window, image input and tool calling. On the Anthropic API since September 28, 2026.
Access details: Anthropic API
The model ID to use in API requests.
claude-sonnet-5-5Updated Oct 1, 2026
Capabilities & limits
- Context window
- 1M
- Maximum output
- 128K
- Image input
- Supported
- Tool calling
- Supported
- Structured output
- Supported
Pricing
USD / 1M tokens- Input
- $2.00
- Output
- $10.00
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.
Input tokens
$2.00 per 1M tokens- Claude API global standard
Output tokens
$10.00 per 1M tokens- Claude API global standard
Cache reads
$0.10 per 1M tokens- prompt caching
5 minute cache writes
$2.50 per 1M tokens- prompt caching
- 5 minute duration
1 hour cache writes
$4.00 per 1M tokens- prompt caching
- 1 hour duration
Batch API requests are discounted 50% on input and output.
Price history
Oct 1, 2026
Input $2.00 per million tokens
Oct 20, 2026
Input $2.00 per million tokens
Oct 1, 2026
Output $10.00 per million tokens
Oct 20, 2026
Output $10.00 per million tokens
Technical details
- Parameters
- Not published
- Active parameters
- Not published
- Architecture
- Not published
- Training / knowledge cutoff
- Jun 2026
- Input modalities
- Text, image
- Output modalities
- Text
From Anthropic
Official announcement ↗How they describe it
The best combination of speed and intelligence
What they say is new
It’s a clear upgrade over Claude Sonnet 5, runs 30%+ faster, and costs up to 30% less for most work.
Release & lifecycle
- First available
- Sep 28, 2026
- available
- As of Oct 1, 2026