# Introducing Claude 2.1

Source: https://www.anthropic.com/news/claude-2-1
Published: 2023-11-21
Status: unreviewed source report

## Source excerpt (up to 25 words)

> Claude 2.1 brings a 200K token context window, a 2x reduction in hallucination rates, beta tool use, and system prompts.

## Review question

Compare accepted end-to-end outcomes, tool permissions, intervention rate, recovery behavior and total cost on the same workload. A polished demo does not establish unattended reliability.

No independent proof check or claim of peer review.