In early 2026, Google has significantly expanded the model options within its enterprise ecosystem, particularly through **Vertex AI** and the newly launched **Google AI Ultra for Business**.
While Google's own **Gemini 3 Pro** is the flagship model for deep Workspace integration, Google has made **Claude Sonnet 4.5** (and its sibling, Claude Opus 4.5) available as first-class citizens in its enterprise "Model Garden."
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## The Current Landscape: Claude 4.5 on Google Cloud
As of late 2025 and early 2026, Claude 4.5 is no longer just "in testing"; it is generally available for business customers via Google Cloud.
* **Model Availability:** Claude Sonnet 4.5 is accessible through **Vertex AI**, Google’s unified machine learning platform.
* **The "Ultra" Tier:** Under the new **Google AI Ultra for Business** license, users get high-usage limits for both Gemini 3 Pro and partner models like Claude 4.5 Sonnet within Google’s agentic development tools (such as "Antigravity").
* **Context Window:** Claude Sonnet 4.5 on Vertex AI supports a standard 200k token context, with a **1-million-token beta** specifically available on certain Google Cloud endpoints to compete with Gemini’s native long-context capabilities.
## Comparative Strengths for Business
Businesses are typically choosing between the two based on specific departmental needs:
| Feature | **Gemini 3 Pro** | **Claude Sonnet 4.5** |
| --- | --- | --- |
| **Primary Strength** | Multimodality (Video/Audio/Docs) | Coding & Agentic Autonomy |
| **Ecosystem** | Deep Workspace integration (Gmail/Docs) | Standalone API / Model Garden |
| **Reasoning** | "Deep Think" mode for complex math/science | Refined "Constitutional AI" for safety/policy |
| **Max Context** | 1M+ tokens (Native) | 200k (GA) / 1M (Beta) |
| **Coding** | 2,439 Elo (LiveCodeBench) | 77.2% (SWE-bench Verified) |
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## Why Google is Hosting Its Rival
Google’s strategy has shifted toward becoming the "execution layer" for AI. By offering Claude 4.5 alongside Gemini, Google Cloud (Vertex AI) ensures that enterprise customers don't leave for AWS or Azure just to access Anthropic’s models.
> **Key Integration:** Businesses using **Gemini Code Assist** can now leverage Claude 4.5 Sonnet's superior agentic reasoning to handle multi-day development projects, all while staying within Google’s security and compliance (IAM) perimeter.
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