Claude 2.1
RetiredAn Anthropic model with a 200K-token context window. Released on the Anthropic API November 21, 2023, now retired.
Access details: Anthropic API
The model ID to use in API requests.
claude-2.1Updated Sep 23, 2026
Capabilities & limits
- Context window
- 200K
- Maximum output
- 4K
- Image input
- Unsupported
- Tool calling
- —
- Structured output
- Unsupported
Pricing
USD / 1M tokens- Input
- No longer sold
- Output
- No longer sold
No longer sold on the Anthropic API.
Price history
Jul 21, 2025
Input No longer sold per million tokens
Jul 21, 2025
Output No longer sold per million tokens
Technical details
- Parameters
- Not published
- Active parameters
- Not published
- Architecture
- Not published
- Training / knowledge cutoff
- Early 2023
- Input modalities
- Text
- Output modalities
- Text
From Anthropic
Official announcement ↗Release & lifecycle
- First available
- Nov 21, 2023
- retired
- As of Sep 13, 2026