AIster · The agentic age · Launches
Anthropic releases Claude Opus 4.5
Anthropic's top-tier model, released eight weeks after Sonnet 4.5
Key facts
- Date
- 24 Nov 2025
- Era
- The agentic age
- Interest
- Launches
- Threads
- Model wars, Agents
- Released
- 24 Nov 2025
- API price
- $5/$25 per million tokens
- Take-home test
- Anthropic said Opus 4.5 scored higher than any human candidate ever on its 2-hour performance-engineering take-home exam
Claude Opus 4.5 followed Sonnet 4.5 on 24 November 2025, priced at $5 per million input tokens and $25 per million output tokens (tokens are the chunks of text a model reads and writes). Anthropic said it scored higher than any human candidate ever on the company's own two-hour performance-engineering take-home exam.
Sources
- Anthropic, Introducing Claude Opus 4.5, 2025-11-24