# Claude Opus 4.5

Claude Opus 4.5 is a model from Anthropic, released on 24 Nov 2025. The context window is 200,000 tokens. The maximum output is 64,000 tokens. Pricing is $5.00 per million input tokens and $25.00 per million output tokens.

- Developer: Anthropic
- Id: claude-opus-4-5
- Released: 2025-11-24T00:00:00.000Z
- Sighting: 2026-09-21T18:47:57.048Z
  - [evidence link](https://models.dev/#claude-opus-4-5)
- Status: Released
- Canonical: https://alexgetman.com/models/anthropic/claude-opus-4-5/

## Questions

### What is the context window of Claude Opus 4.5?

The context window is 200,000 tokens. The maximum output is 64,000 tokens.

### How much does Claude Opus 4.5 cost?

Pricing is $5.00 per million input tokens and $25.00 per million output tokens. Cached input is $0.50 per million.

### When was Claude Opus 4.5 released?

On 24 Nov 2025.

## Evidence links

- [Artificial Analysis · benchmarks](https://artificialanalysis.ai/models)
- [Azure Foundry · lifecycle](https://learn.microsoft.com/en-us/azure/foundry/concepts/model-lifecycle-retirement?view=azureml-api-2)
- [models-dev](https://models.dev/#claude-opus-4-5)
- [models.dev · catalogue](https://models.dev/#claude-opus-4.5)
- [OpenCode · discovery](https://opencode.ai/data/anthropic/claude-opus-4-5)
- [anthropic-pricing](https://platform.claude.com/docs/en/about-claude/pricing)
- [review](https://platform.claude.com/docs/en/models/opus-4-5/overview)
- [Vercel AI Gateway](https://vercel.com/ai-gateway)
- [Arena · leaderboards](https://www.anthropic.com/news/claude-opus-4-5)

## Signals

- [Claude Opus 4.5 spotted on models.dev](https://alexgetman.com/signals/2026/09/15/claude-opus-4-5-non-reasoning/)