# Claude 1

Claude 1 is an AI model released by Anthropic on Mar 14 2023. It has a 9k context window.

## Facts

| Field | Value |
| --- | --- |
| Model | Claude 1 |
| Developer | Anthropic |
| Release date | Tuesday, Mar 14 2023 |
| Licensing | Closed |
| Context window | 9k |

## Questions and answers

### When was Claude 1 released?

Claude 1 was released by Anthropic on Tuesday, Mar 14 2023.

### Who made Claude 1?

Claude 1 was built by Anthropic. AI safety company building the Claude family of models. Founded in 2021 by former OpenAI researchers.

### What is the context window of Claude 1?

Claude 1 has a context window of 9k. That is the maximum amount of input plus output the model can hold in a single request.

### Is Claude 1 open source?

No. Claude 1 is a closed model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.

### What came before and after Claude 1?

It was followed by Claude 2 on Jul 11 2023.


---

Canonical page: https://aireleasetracker.com/model/anthropic/claude-1
Site index: https://aireleasetracker.com/llms.txt
Source: AI Release Tracker (https://aireleasetracker.com). Most benchmark scores come from lab launch material; gathered results identify the leaderboard that published them.