Anthropic Vertex plugin for Claude models on Google Vertex AI
This page covers the OpenClaw Anthropic Vertex provider plugin, which enables Claude models through Google Vertex AI. It is intended for developers integrating Claude Fable 5 or Sonnet 5 into their applications.
Read this when
- You are installing, configuring, or auditing the anthropic-vertex plugin
Anthropic Vertex plugin
The OpenClaw Anthropic Vertex provider plugin enables Claude models through Google Vertex AI.
Distribution
- Package name:
@openclaw/anthropic-vertex-provider - Available from: npm, ClawHub
Surface
provider configuration: anthropic-vertex
Claude Fable 5
Configure anthropic-vertex/claude-fable-5 when the model is supported in your Google Cloud region.
Fable 5 applies adaptive thinking by default with high effort. Since the model cannot disable thinking, /think off and /think minimal run at low effort.
Claude Sonnet 5
Point anthropic-vertex/claude-sonnet-5 at the Vertex global, us, or eu endpoint. Sonnet 5 uses adaptive thinking at high effort by default and accepts /think off or the built-in /think xhigh|max settings. OpenClaw automatically advertises a 1,000,000-token context window and a 128,000-token output limit.
Pricing follows Vertex's global introductory rate of $2/$10 per million input and output tokens until August 31, 2026, switching to $3/$15 on September 1. Vertex's documented 10% premium applies to the us and eu multi-region endpoints.