Model
Model explorer

Claude 2.1

CLOSED
Anthropic · Claude 2 family · released Nov 21, 2023

Industry-first 200K context window, ~2x fewer hallucinations than Claude 2.0, plus beta tool use and system prompts.

ReasoningCodingVisionFunction callingTool useAgentic
565.4
Elo · unrated
Parameters
Undisclosed
Active params
—
Context
200K tokens
Architecture
Dense decoder-only Transformer (parameter count undisclosed)
License
Proprietary (Anthropic Commercial Terms of Service)
Languages
—
API price (in/out)
$8 / $24
Modalities
text
Benchmark results
Bar shows position within the tracked field; marker = field best
MMMLUKnowledge63.4%#50
best: Gemini 3.1 Pro · 92.6%
Run it locally
Closed weights — available via API only. No local deployment.
Input / M tok
$8
Output / M tok
$24
Claude 2 family
Elo progression across releases
Claude 2Jul 2023821.5Claude 2.1Nov 2023565.4
Resources
DOCSdocs.claude.com
API price $8/$24 · each benchmark row carries its own source badge (see methodology)