Claude 2.1

anthropic

Anthropic's improved Claude 2 with doubled 200K context window and reduced hallucination rates. Claude 2.1 introduced beta tool use capabilities. This model has been retired and is no longer available for use.

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Example Use Cases

Very long document analysis without vision

Reasoning over large text corpora

Basic tool-augmented workflows

Technical Specifications

Context Window

200,000 tokens

Max Output

4,096 tokens

Cache Miss Cost

$8 per 1M tokens

Non-Reasoning Cost

$24 per 1M tokens

Web Search Cost

$15 per 1K calls

Code Execution Cost

$0.19 per 1K calls

⚠️ Legacy

Made legacy on

Reason

Retired model

Recommended Replacement

Claude Opus 4.6