100K context window
Claude's context window grows from 9K to 100K tokens (about 75,000 words), enabling whole-book and whole-codebase prompts.
Context rises more than 11x in one step. In the demo, Anthropic loaded The Great Gatsby (72K tokens, via Claude Instant), changed one line, and Claude found the edit in 22 seconds. Pitched at long financial, legal and developer-documentation analysis. Early long-context lead over contemporaries.
- Date
- Thursday, 11 May 2023
- Lab
- Anthropic
- Kind
- feature
- Access
- closed API
Figures
| Measure | Value | Measured by |
|---|---|---|
| Context window | 100K tokens up from 9K; roughly 75,000 words | company |
| Gatsby edit-spotting demo | 22 seconds 72K-token book on Claude-Instant | company |
Demo was on Claude-Instant, not the larger model. 'Early long-context lead' is an inference from the size jump; no rival comparison was checked.
Sources
This record was checked against its sources on 6 October 2026. How we check