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xAI: Grok 4

x-ai/grok-4

Released Jul 9, 2025Knowledge cutoff Jul 31, 2025256,000 context$3/M input tokens$15/M output tokens

Grok 4 is xAI's latest reasoning model with a 256k context window. It supports parallel tool calling, structured outputs, and both image and text inputs. Note that reasoning is not exposed, reasoning cannot be disabled, and the reasoning effort cannot be specified. Pricing increases once the total tokens in a given request is greater than 128k tokens. See more details on the xAI docs

Recent activity on Grok 4

Total usage per day on OpenRouter

Prompt
434M
Reasoning
55.4M
Completion
31.1M

Prompt tokens measure input size. Reasoning tokens show internal thinking before a response. Completion tokens reflect total output length.