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Grok 4.5
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Grok 4.5

4.5 · Family: Grok
An Opus-class model released on 9 July 2026 by xAI. Positioned as comparable to Claude Opus 4.7 but faster and cheaper — 2 USD per million input tokens and 6 USD per million output tokens. The first model launch following the company's IPO.
✓ Active✓ Public accessLLMReasoning modelTool-using model📁 Grok
Release date
9 July 2026
🏢xAIProducer
Access:APIHostedDeployment:☁ Cloud

Overview

Grok 4.5 is a general-purpose model released on 9 July 2026, aimed at coding, app building, office work, research and writing. xAI positions it as an Opus-class model — in Elon Musk's words “roughly comparable to Claude Opus 4.7, but much faster.” Its core selling point is capability-to-price ratio: 2 USD per million input tokens and 6 USD per million output tokens, i.e. 2.5x cheaper on input and over 4x cheaper on output than Claude Opus 4.7 (5 USD / 25 USD). The company also claims “twice the token efficiency” of competitors, a figure not yet independently verified. Both the benchmarks and the efficiency claims come from xAI itself rather than independent labs.

Classification
LLMReasoning modelTool-using model
Family: Grok
Access & deployment
APIHosted
Cloud
Weights: Closed
Key parameters
✓ Tools
📥 Input: text

Technical specification

License
Proprietary
Features:✓ Tool use
Modalities
⬇ Input
text
⬆ Output
text

Capabilities and applications

Native model capabilities
Reasoning
The model's ability to reason logically and solve complex problems.
Category: reasoning
Multi-step reasoning
Carrying out multi-step chains of reasoning across long, complex tasks.
Category: reasoning
Coding
Generating, analysing and modifying source code.
Category: coding
Multilingual
Understanding and generating text in many languages.
Category: language
Long context
Maintaining coherence and focus across very long input context.
Category: language
Structured output
Producing data in structured formats such as JSON.
Category: structured_generation
Function Calling
Category: planning
Planning
Forming and executing action plans for complex tasks.
Category: planning

Sources and related pages