Claude Opus 4.5

by Anthropic

Claude Opus 4.5 is a model from Anthropic, released on November 24, 2025. It has a 200K-token context window and can generate up to 64K output tokens. API pricing is $5 per 1M input tokens and $25 per 1M output tokens.

Premium model combining maximum intelligence with practical performance. Best model in the world for coding, agents, and computer use. Most robustly aligned model with best prompt injection resistance of any frontier model. Features extended thinking, 200K context window, 64K max output, and a new effort parameter for controlling reasoning depth. Pricing: $5/$25 per million tokens (input/output).

Key specs

ProviderAnthropic
Release date2025-11-24
Licenseproprietary
Context window200K tokens
Max output64K tokens
Input price$5 / 1M tokens
Output price$25 / 1M tokens
Intelligence Score38
Coding index27.7

Quick answers

What is the context window of Claude Opus 4.5?

Claude Opus 4.5 has a context window of 200K tokens, with a maximum output of 64K tokens per response.

How much does Claude Opus 4.5 cost?

Claude Opus 4.5 costs $5 per 1M input tokens and $25 per 1M output tokens through the API.

Is Claude Opus 4.5 open source?

No. Claude Opus 4.5 is a proprietary model from Anthropic (proprietary license).

When was Claude Opus 4.5 released?

Anthropic released Claude Opus 4.5 on November 24, 2025.

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