Claude Opus 4.1
RetiredAn Anthropic model with a 200K-token context window, image input and tool calling. Released on the Anthropic API August 5, 2025, now retired.
Access details: Anthropic API
The model ID to use in API requests.
claude-opus-4-1-20250805Updated Sep 23, 2026
Capabilities & limits
- Context window
- 200K
- Maximum output
- 32K
- Image input
- Supported
- Tool calling
- Supported
- Structured output
- Supported
Pricing
USD / 1M tokens- Input
- No longer sold
- Output
- No longer sold
No longer sold on the Anthropic API.
Price history
Aug 5, 2026
Input No longer sold per million tokens
Aug 5, 2026
Output No longer sold per million tokens
Technical details
- Parameters
- Not published
- Active parameters
- Not published
- Architecture
- Not published
- Training / knowledge cutoff
- Mar 2025
- Input modalities
- Text, image
- Output modalities
- Text
From Anthropic
Official announcement ↗Release & lifecycle
- First available
- Aug 5, 2025
- retired
- As of Sep 13, 2026