Claude Opus 4.1 API
About
Build advanced reasoning agents with Claude Opus 4.1, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $15.00/1M input and $75.00/1M output tokens, native tool calling support. Access Claude Opus 4.1 via the Vertex (Anthropic) API with up to 32K output tokens.
Capabilities
Input Modalities
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Output Modalities
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Limits
Context Window
200K
Tokens
Input Limit
200K
Tokens
Max Output
32K
Tokens
Pricing
Standard (per 1M tokens)
Input
$15.00
Output
$75.00
Caching (per 1M tokens)
Read
$1.50
Write
$18.75
Frequently Asked Questions
Claude Opus 4.1 by Vertex (Anthropic) costs $15.00 per 1M input tokens and $75.00 per 1M output tokens. Cached reads cost $1.50 per 1M tokens. Cache writes cost $18.75 per 1M tokens.
Model Details
ID
claude-opus-4-1@20250805
Provider
Vertex (Anthropic)Family
claude-opus
Release Date
Aug 5, 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