Overview
Grok 4.5 is a language model from xAI built for coding, knowledge work and STEM tasks. xAI describes it as an intelligent coding model for agentic software, engineering and workflow tasks. It supports reasoning, tool calling, structured output and image understanding, reads text and images, and replies in text.
It has a 500,000-token context window. It accepts text and image input and returns text. It was released on July 8, 2026. Its knowledge cutoff is February 1, 2026.
Capabilities
Grok 4.5 can reason through a problem before it answers, call external tools, and return responses in a fixed structured format. Those three abilities suit agentic software and workflow tasks, where a model has to plan, use tools and hand back data that other systems can read.
Image understanding is built in, so you can send a screenshot, diagram or photo together with text and get a written answer. Output is always text.
Pricing
Grok 4.5 is priced from $2.00 per 1M input tokens and $6.00 per 1M output tokens. Cached input reads cost $0.30 per 1M tokens. The prices shown are for the starting tier; requests with very long prompts are billed at higher rates.
Grok 4.5 is available through RealRelay's OpenAI-compatible API.
Use cases
Use Grok 4.5 for agentic software and engineering work: it can reason over a task, call tools to read or change a project, and return structured results that scripts and pipelines can parse.
It also fits knowledge work and STEM questions, such as analysing a report, working through a technical problem, or explaining a chart sent as an image alongside the question.
What is Grok 4.5?
Grok 4.5 is a language model from xAI built for coding, knowledge work and STEM tasks. xAI describes it as an intelligent coding model for agentic software, engineering and workflow tasks. It supports reasoning, tool calling, structured output and image understanding, reads text and images, and replies in text.
How much does Grok 4.5 cost?
Grok 4.5 is priced from $2.00 per 1M input tokens and $6.00 per 1M output tokens. Cached input reads cost $0.30 per 1M tokens. The prices shown are for the starting tier; requests with very long prompts are billed at higher rates.
What is the context window of Grok 4.5?
Grok 4.5 has a 500,000-token context window.
What inputs and outputs does Grok 4.5 support?
Grok 4.5 accepts text and image input and returns text.
Does Grok 4.5 support tool calling and reasoning?
Yes. Grok 4.5 supports reasoning, tool calling, structured output and image understanding, and it returns text.
When was Grok 4.5 released?
Grok 4.5 was released on July 8, 2026.
How do I call Grok 4.5 through the API?
Call Grok 4.5 through RealRelay's OpenAI-compatible API by setting the model field to xai/grok-4.5.