Claude Opus 4.5 API
About
Build advanced reasoning agents with Claude Opus 4.5, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $5.00/1M input and $25.00/1M output tokens, native tool calling support. Access Claude Opus 4.5 via the Vertex (Anthropic) API with up to 64K output tokens.
Capabilities
Input Modalities
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Output Modalities
text
Reasoning
Yes
Structured Output
No
Tool Use
Yes
WeightsClosed
Temperature
Adjustable
Attachment
Supported
Limits
Context Window
200K
Tokens
Input Limit
200K
Tokens
Max Output
64K
Tokens
Pricing
Standard (per 1M tokens)
Input
$5.00
Output
$25.00
Caching (per 1M tokens)
Read
$0.50
Write
$6.25
Frequently Asked Questions
Claude Opus 4.5 by Vertex (Anthropic) costs $5.00 per 1M input tokens and $25.00 per 1M output tokens. Cached reads cost $0.50 per 1M tokens. Cache writes cost $6.25 per 1M tokens.
Model Details
ID
claude-opus-4-5@20251101
Provider
Vertex (Anthropic)Family
claude-opus
Release Date
Nov 24, 2025
Knowledge Cutoff
Mar 31, 2025
API Integration
NPM Package
@ai-sdk/google-vertex/anthropic
Environment Variables
GOOGLE_VERTEX_PROJECT
GOOGLE_VERTEX_LOCATION
GOOGLE_APPLICATION_CREDENTIALS