No longer supported

This model is deprecated (released March 2023) and is no longer actively maintained or recommended by Anthropic. Consider using their current flagship model instead.

deprecatedlegacyllm Proprietary

Claude 1.3

by Anthropic· Released March 2023· Cutoff December 2022

Claude 1.3 was an early version of Anthropic's Claude model, focused on safe and helpful dialogue. It was part of the initial Claude 1.x series, offering improved performance over Claude 1.2 in instruction following and reduced harmful outputs. This model has been superseded by later Claude generations.

Official Site

Input cost

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Output cost

—

Context window

9000 tokens

Max output

3000 tokens

Modalities

text

License

proprietary

Capabilities

Text GenerationConversational AIInstruction FollowingSafety Alignment

Best For

Early adopters needing a safe, helpful conversational AI for text-based tasks.

Strengths

Strong safety alignment and reduced harmful outputs
Good instruction following for its time
Clear and coherent text generation

Limitations

Limited context window (9K tokens)
No vision or multimodal capabilities
Outperformed by later Claude models
No function calling or structured output support

Use Cases

General question answering

Content generation

Basic customer support chatbots

Educational tutoring

Drafting emails and documents

Brainstorming ideas

Simple code generation

Improvements Over Previous Model

Improved instruction following over Claude 1.2
Reduced rate of harmful outputs
Better coherence in longer conversations
Enhanced safety alignment techniques

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