Curiosity · AI Model
Grok 4
Grok 4 is xAI's flagship large language model, designed as a direct competitor to GPT-5 and Claude Opus 4.7. It offers a 256k context window, native tool use, image understanding, and tight integration with the X platform's real-time data firehose — letting agents ground answers in live posts, trends, and news without an external search layer.
Model specs
- Vendor
- xAI
- Family
- Grok
- Released
- 2025-07
- Context window
- 256,000 tokens
- Modalities
- text, vision, code
- Input price
- $3/M tok
- Output price
- $15/M tok
- Pricing as of
- 2026-04-20
Strengths
- Native live-web grounding through the X firehose
- Strong reasoning performance with 'Think' mode enabled
- Competitive pricing vs. GPT-5 and Claude Opus 4.7
- Less restrictive content filtering for edgy or satirical use cases
Limitations
- Less ecosystem maturity than OpenAI / Anthropic (fewer SDKs, integrations)
- Brand association with Elon Musk can be a governance concern for some enterprises
- Vision capability trails Gemini 2.5 Pro for dense document OCR
Use cases
- Real-time trend analysis grounded in live X posts
- Developer copilots via the xAI API
- Research agents needing fresh web data without a separate search tool
- Content moderation and social-listening pipelines
Benchmarks
| Benchmark | Score | As of |
|---|---|---|
| MMLU-Pro | ~85% | 2026-04 |
| GPQA Diamond | ~68% | 2026-04 |
| HumanEval | ~92% | 2026-04 |
Frequently asked questions
What is Grok 4?
Grok 4 is xAI's flagship 2026 large language model, offering a 256k context window, native tool use, vision input, and real-time grounding via the X platform. It is positioned as a direct competitor to GPT-5 and Claude Opus 4.7.
How is Grok 4 different from other LLMs?
Its defining feature is tight integration with X (formerly Twitter). Grok can pull live posts, trending topics, and public conversations into its context, making it especially useful for real-time social analytics and news-aware agents.
What does Grok 4 cost?
As of April 2026, Grok 4 is priced around USD 3 per million input tokens and USD 15 per million output tokens on the xAI API, roughly a fifth the cost of Claude Opus 4.7 for output.
Is Grok 4 open-source?
No. Grok 4 is a proprietary model served through xAI's API and the X Premium+ subscription. Earlier versions (Grok-1) were open-weighted, but Grok 4 is closed.
Sources
- xAI — Grok product page — accessed 2026-04-20
- xAI API docs — accessed 2026-04-20