Claude 2.1

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Release Date: November 21, 2023 Availability: API (via Console) and powering the claude.ai chat experience (free and Pro tiers).

Key Advancements

Capacity: Doubles the previous limit to 200,000 tokens, equivalent to roughly 150,000 words or over 500 pages of material.
Use Cases: Enables processing of entire codebases, financial statements (e.g., S-1s), or long literary works for summarization, Q&A, trend forecasting, and document comparison.
Note: Processing this context length is complex and may take a few minutes. Latency is expected to decrease over time. Access is reserved for Claude Pro users.

Honesty: Achieves a 2x decrease in false statements (hallucinations) compared to Claude 2.0.
Testing Method: Evaluated on complex factual questions using a rubric that distinguishes incorrect claims from admissions of uncertainty. Claude 2.1 is more likely to demur when unsure.
Comprehension: Shows a 30% reduction in incorrect answers and a 3-4x lower rate of mistakenly concluding a document supports a particular claim, especially for long, complex documents (legal, financial, technical).

Functionality: Allows Claude to integrate with external tools, APIs, and data sources to perform actions on behalf of the user.
Examples of Use:
- Using a calculator for complex numerical reasoning.
- Translating natural language into structured API calls.
- Answering questions via database or web search APIs.
- Taking actions in software via private APIs.
- Connecting to product datasets for recommendations.
Status: Early development; developer features and prompting guidelines are being built.

Workbench: A new playground-style interface for iterating on prompts, accessing model settings, and managing multiple prompts with saved revisions.
System Prompts: Allow users to provide custom instructions to set context, define personalities/roles, and structure responses for consistent, customizable outputs.
Code Generation: Developers can generate code snippets for their prompts to use directly in Anthropic's SDKs.

Pricing has been updated to improve cost efficiency for customers across models.

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