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LLM Index

Gemini vs. Grok

A side-by-side comparison of release history, capabilities, licensing and model sizes.

Attribute Gemini Grok
Developer Google xAI
Current generation Gemini 3.5 Grok 4.5
Initial release 2023-03-21 2023-11-05
Instruct tuned Yes Yes
Coding Yes Yes
Finetuning Yes Yes
Open source No No
License NA NA
Model sizes Undisclosed Undisclosed
Links
Website Pricing
Website Pricing

Gemini

Gemini is Google's multimodal model family for consumer, developer, and enterprise applications. The current generation includes Gemini 3.5 for fast agentic workflows and Gemini 3.1 Pro for complex reasoning.

Google introduced Bard in March 2023 and renamed the product Gemini in February 2024. The Gemini family combines text, image, audio, video, code, and tool-use capabilities across the Gemini app, Gemini API, Vertex AI, and Google's productivity products. Gemini 3.1 Pro arrived in February 2026, followed by the faster Gemini 3.5 generation at Google I/O 2026.

Further reading

Grok

Grok is the proprietary model family available through xAI's products and API. Grok 4.5 is the current generation, focused on coding, agentic tasks, reasoning, and knowledge work.

xAI introduced Grok in November 2023 and released the weights for Grok-1 under Apache 2.0 in March 2024. Later generations are proprietary and available through Grok, X, and the xAI API. Grok 4.5, released in July 2026, is xAI's current flagship model for software engineering, tool-driven agents, complex reasoning, and professional knowledge work.

Further reading

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