# Claude Opus 5

> Claude Opus 5 was Anthropic's flagship Opus model from July 24, 2026 until Claude Opus 5.5 replaced it on September 22, 2026. It is now a legacy model that is still available on the API at $5 / $25 per 1M input/output tokens, with a 1M-token context window.

URL: https://aistack.sh/model/claude-opus-5
Vendor: Anthropic (product page: https://aistack.sh/tool/claude)
Last checked against sources: 2026-09-24

## Specs

- Released: Jul 24, 2026
- Status: Legacy
- API model ID: claude-opus-5
- API price (in / out): $5 / $25 per 1M tokens
- Cache read: $0.50 per 1M tokens
- Context window: 1M tokens
- Platforms: Claude API, Amazon Bedrock, Claude Platform on AWS, Google Cloud, Microsoft Foundry

## Where you can use it

- Listed under legacy models (still available) in Anthropic's models overview.

## FAQ

### Is Claude Opus 5 still available?

Yes, as a legacy model. Anthropic's models overview lists it under legacy models that are still available, and points Opus 5 users to the migration guide for Opus 5.5.

### How much does Claude Opus 5 cost?

$5 per 1M input tokens and $25 per 1M output tokens, with cache reads at $0.50. Opus 5.5 costs $4 / $20.

### What is the Claude Opus 5 context window?

1M tokens, both the default and the maximum, with 128k max output tokens.

## Sources

- [Claude Developer Platform release notes](https://platform.claude.com/docs/en/release-notes/overview), read 2026-09-24
- [Claude API pricing](https://platform.claude.com/docs/en/about-claude/pricing), read 2026-09-24
- [Claude models overview](https://platform.claude.com/docs/en/about-claude/models/overview), read 2026-09-24