# Claude Opus 4

Claude Opus 4 is a model from Anthropic, first recorded on 21 Sep 2026; its release date is not established. The context window is 200,000 tokens. The maximum output is 32,000 tokens. Pricing is $15.00 per million input tokens and $75.00 per million output tokens.

- Developer: Anthropic
- Id: claude-opus-4
- Reported: 2026-06-02T00:00:00.000Z
- Sighting: 2026-09-21T16:38:54.650Z
  - [evidence link](https://models.dev/#claude-opus-4)
- Status: Sighting
- Canonical: https://alexgetman.com/models/anthropic/claude-opus-4/

## Questions

### What is the context window of Claude Opus 4?

The context window is 200,000 tokens. The maximum output is 32,000 tokens.

### How much does Claude Opus 4 cost?

Pricing is $15.00 per million input tokens and $75.00 per million output tokens. Cached input is $1.50 per million.

### When was Claude Opus 4 released?

Its release date is not established. Signal Forge first recorded it on 21 Sep 2026.

## Timeline

- 2026-10-07T19:43:10.391Z · [Claude Code · changelog](https://code.claude.com/docs/en/changelog)
- 2026-11-13T20:01:49.880Z · [Anthropic · official articles](https://www.anthropic.com/threat-intelligence-report-september-2026)

## Evidence links

- [Claude Code · changelog](https://code.claude.com/docs/en/changelog)
- [models-dev](https://models.dev/#claude-opus-4)
- [anthropic-pricing](https://platform.claude.com/docs/en/about-claude/pricing)
- [anthropic-articles](https://www.anthropic.com/threat-intelligence-report-september-2026)

## Signals