Grok 4.5

Supported Functionality

Item	Specification
Input	Text, image
Output	Text
Context	500,000 tokens
Max Output	Not separately published by the provider
Vision	✓ Supported
Function Calling	✓ Supported

Description

Grok 4.5 is a multimodal reasoning model released by SpaceXAI on July 16, 2026 under the API code grok-4.5. Built for coding, agentic software, engineering, and knowledge work, it supports text and image inputs, text output, a 500,000-token context window, function calling, and structured output.

Its training emphasizes multi-step software engineering, science, engineering, and mathematics. It can build complete applications from brief requirements and use tools for research, spreadsheets, presentations, and documents. Its effective reasoning levels are low, medium, and high, with high as the default; xhigh is treated as high on this model.

Key Capabilities

• Multi-Step Software Engineering: Diagnoses, implements, tests, and repairs changes in real repositories.
• End-to-End Application Development: Builds functional, visually designed applications or websites from short requirements.
• Agent Tool Orchestration: Uses functions, search, files, and code execution in research-and-action loops.
• Engineering and STEM Reasoning: Analyzes scientific, engineering, mathematical, and technical problems.
• Knowledge Work: Produces reports, spreadsheet models, presentations, documents, and professional content.
• Image Understanding: Combines text with screenshots, charts, and interface references for development and review.
• Long-Context Analysis: Processes large projects and document collections within 500,000 tokens.

Technical Strengths

Feature	Benefit
500,000-Token Context	Fits large repositories, long documents, and extended agent trajectories.
Engineering-Focused Training	Strengthens multi-step software engineering, coding, science, engineering, and mathematics.
Efficient Reasoning	Completes real engineering work in fewer steps for sustained development workflows.
Text and Image Input	Analyzes code, requirements, screenshots, and charts in one context.
Structured Output	Returns schema-constrained results for reliable downstream parsing.
Function Calling	Connects the model to external tools, business systems, and validation flows.

Frequently Asked Questions

How should I choose a reasoning level for Grok 4.5?

Use low for simple tools and fast tasks, medium for complex data or long-context work, and the default high for difficult engineering, mathematics, and multi-step problems. Compare completion rate, tool loops, and response time on representative workloads.

Does Grok 4.5 support xhigh reasoning?

It does not provide a distinct xhigh level. Requests using xhigh are treated as high, so applications should not model them as separate capability tiers.

When should I choose Grok 4.5 instead of Grok 4.6?

Grok 4.6 is the later release with a stronger focus on long-running agents and ambitious visual or interactive work, while 4.5 remains suitable for established coding and knowledge workflows. Run regression tests on repositories, tools, and image inputs before migrating.

How does Grok 4.5 connect to live information and files?

Server-side search, file retrieval, code execution, and custom functions can extend the model. Current information requires explicit tools and verification of important sources.

How do I call Grok 4.5 on LinkModel?

Grok 4.5 is available on LinkModel. Use the public model ID, request schema, and parameters shown on LinkModel's live page, beginning with short text and streaming tests before images and tools.

How should I validate the Grok 4.5 integration on LinkModel?

Confirm context, image input, reasoning levels, structured output, and tool support on the current LinkModel page, then test long context, images, functions, and error recovery separately. Do not assume xAI-specific tools or parameters pass through unchanged.