xAI is the company behind the Grok models. Atlas AI Center tracks 5 xAI models: 5 available through APIs with published per-token pricing. Listed input prices range from $1.25 to $2 per million tokens.
Ordered by current popularity signals, then by release date.
xAI · Sep 21, 2026
Grok 4.7 is SpaceXAI's flagship model for coding, agentic tasks, and knowledge work, succeeding Grok 4.6. It is particularly strong at long-running software engineering tasks, verifying its own…
xAI · Jul 8, 2026
Grok 4.5 is a model from SpaceXAI with frontier performance on coding, knowledge work, and STEM.
xAI · Aug 12, 2026
Grok 4.6 is a model from SpaceXAI with frontier performance on coding, knowledge work, and STEM. It is succeeded by [Grok 4.7](/x-ai/grok-4.7).
xAI · Apr 30, 2026
Grok 4.3 is a reasoning model from SpaceXAI. It accepts text and image inputs with text output, and is suited for agentic workflows, instruction-following tasks, and applications requiring high…
xAI · Mar 31, 2026
Grok 4.20 is a reasoning model from SpaceXAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance,…
The most recently released xAI model in the catalog is Grok 4.7, released on Sep 21, 2026.
Grok 4.7 currently has the strongest popularity signal among xAI models in the catalog, based on position #57 in OpenRouter's weekly usage ranking.
Grok 4.20 has the largest listed context window at 2,000,000 tokens.
Prices are set per million tokens. Listed input prices range from $1.25 to $2 per million tokens. Output tokens usually cost more than input tokens; see each model page for exact numbers.