How much does the Grok 4 API cost?

Grok 4 costs $3 per million input tokens and $15 per million output tokens, with cached input at $0.75 per million. A workload of 10M input and 1.5M output tokens per month costs about $52.50.

What is the context window of Grok 4?

Grok 4 supports a context window of 256,000 tokens (256K).

Is Grok 4 open source?

No — Grok 4 is a proprietary model available through xAI's API and partner platforms.

What are the best alternatives to Grok 4?

The closest alternatives by overall capability are Qwen3-Max, GPT-5.5, Gemini 3 Pro, Gemini 2.5 Pro. See the comparison pages for detailed head-to-head breakdowns.

Grok 4

xAI·Jul 2025reasoningproprietary

Grok 4 marked xAI's arrival as a genuine frontier lab: top-tier GPQA and AIME scores, native tool use during reasoning, and live X data integration. Trained on the Colossus supercluster, it briefly led several reasoning leaderboards in mid-2025. The 4.x line has since iterated quickly; Grok 4 remains the most thoroughly benchmarked xAI model and a common comparison anchor.

Benchmark results

Where it shines

Excellent competition math and hard-science reasoning
Native tool use inside its chain of thought
Real-time knowledge through X integration

Alternatives to Grok 4

Qwen3-Max

Alibaba's trillion-parameter API flagship — frontier-adjacent quality with strong agentic tool use at mid-tier prices.

GPT-5.5

OpenAI's flagship reasoning model with a 1M-token context window, built for hard coding, science and long-horizon agentic work.

Gemini 3 Pro

Google's November 2025 frontier breakout — 91.9% GPQA Diamond and 37.5% HLE made it the reasoning leader of its generation.

Gemini 2.5 Pro

Google's 2025 workhorse flagship — first mainstream thinking model with a 1M context, still widely deployed.

Frequently asked questions

How much does the Grok 4 API cost?: Grok 4 costs $3 per million input tokens and $15 per million output tokens, with cached input at $0.75 per million. A workload of 10M input and 1.5M output tokens per month costs about $52.50.
What is the context window of Grok 4?: Grok 4 supports a context window of 256,000 tokens (256K).
Is Grok 4 open source?: No — Grok 4 is a proprietary model available through xAI's API and partner platforms.
What are the best alternatives to Grok 4?: The closest alternatives by overall capability are Qwen3-Max, GPT-5.5, Gemini 3 Pro, Gemini 2.5 Pro. See the comparison pages for detailed head-to-head breakdowns.