# Grok 4 Heavy Review & Benchmarks (2026): Price, Context, Specs | Alher Tech

> Grok 4 Heavy by xAI: benchmarks, pricing, context window, strengths and use cases. Data from official benchmark sources.

- Canonical page: https://alhertech.com/en/ai-comparison/grok-4-heavy/
- Site: Alher Tech (custom software, AI agents and SEO engineering, https://alhertech.com/)
- Contact: https://alhertech.com/en/contact/

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Last updated: April 22, 2026

## Specs

- **Vendor**: xAI
- **Released**: July 9, 2025
- **Context window**: 256K tokens
- **Input**: $15 / M tokens
- **Output**: $60 / M tokens

## Benchmarks

- **mmlu**: 89.3
- **gpqa**: 74.5
- **humanEval**: 88.4
- **arenaElo**: 1391
- **sweBench**: 55
- **sweBenchPro**: 50
- **liveCodeBench**: 70
- **aiderPolyglot**: 66
- **terminalBench**: 40
- **mmluPro**: 85
- **hle**: 24
- **aime**: 92
- **math500**: 96
- **mmmu**: 74

## Strengths

- Multi-agent reasoning mode: several Grok instances debate
- Strong on Humanity's Last Exam and competition math
- Realtime X (Twitter) grounding

## Weaknesses

- Expensive per reply because of multi-agent debate
- Smaller developer ecosystem than OpenAI/Anthropic
- Not suited for realtime UX

## Best for

- Hard one-shot reasoning with parallel debate
- Research workloads leaning on X data
- Edgy use cases where other models refuse

[Compare with other AI models](https://alhertech.com/en/ai-comparison/)