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Specs

Context window100K tokens
Inputs → outputsText → Text
Open weightsNo
StatusRetired

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Claude Opus 5 is Anthropic’s flagship model for demanding reasoning, coding, and long-horizon agentic work. It is particularly strong at end-to-end software tasks, code review and bug finding, visual analysis...

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Questions about Claude 1

What is Claude 1?

Anthropic's first public Claude model, built with its Constitutional AI approach to be helpful, honest and harmless.

How big is the context window of Claude 1?

Claude 1 can read up to 100,000 tokens in one request, roughly 75,000 words.

Is Claude 1 open source?

Claude 1 does not have downloadable weights. You use it through Anthropic or an API provider.

Can I still use Claude 1?

Anthropic has switched Claude 1 off, so it can no longer be used through their app or API. It is listed here for history and comparison; see the newer Anthropic models below.

What can Claude 1 take as input?

Claude 1 accepts text and produces text.

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Specs come from the provider's announcement and papers. Last checked 14 Mar 2023.

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