Grok 4 is an inference model released by xAI on July 10, 2025. It accepts text and image inputs and generates text outputs. It features a 256K token context window, with core capabilities in reasoning and multilingual support.
Parameters
Undisclosed
Context Window
License
Proprietary
Release Date
2025-07-10
API Pricing
Input Price (per 1M tokens)
$3
Output Price (per 1M tokens)
$
Billing Mode: standard
Strengths
- •Multilingual support
- •Large 256K context window
- •Advanced reasoning capabilities
Weaknesses
- •Closed-source license limits flexibility
- •Output limited to text only
- •New model with an unestablished track record
Use Cases
- •Reasoning and analysis on multilingual text
- •Analyzing image data
- •Developing API-integrated applications
Deep Analysis
Intelligence Index
73
Artificial Analysis index; frontier-tier reasoning and coding
GPQA Diamond
87.5%
Graduate-level science Q&A; among the strongest launch results
SWE-bench Verified
72.5%
Resolving real GitHub issues with human verification
AIME 2025
91.7%
Competition-level mathematics
Input Price
$3/1M
Output $15/1M; prompt-cache $0.75/1M (75% off); 2x above 128K tokens
Context Window
256K tokens
Text + image input; knowledge cutoff Dec 31, 2024
Strengths
- ・Frontier reasoning: 87.5% GPQA Diamond and 91.7% AIME 2025 place it among the strongest models released in mid-2025.
- ・Cost-efficient for a frontier model: $3 input / $15 output per million tokens is far below Claude Opus 4 ($15/$75), and prompt caching cuts repeated prefixes to $0.75/1M (75% off).
- ・Accepts image input with real-time X (Grok) integration and strong multilingual support, useful for research and live-data tasks.
Weaknesses
- ・256K context is smaller than Gemini 2.5 Pro's 1M window, limiting very-long-document, video-transcript, or large-codebase work.
- ・Throughput (~44-75 tokens/s) and latency trail OpenAI o3 and Claude, making it less suited to interactive, latency-critical chat.
- ・No open weights; the $300/month SuperGrok Heavy tier is the most expensive mainstream consumer subscription, and the knowledge cutoff is Dec 2024.
Competitor Comparison
| Model | Arena | SWE | GPQA | Price |
|---|---|---|---|---|
| Claude Opus 4 (Anthropic) | N/A | SWE-bench Verified 72.5% | 79.6% | $15/$75 |
| Gemini 2.5 Pro (Google) | N/A | SWE-bench Verified ~72% | 86.5% | $1.25/$10 |
| GPT-5 (OpenAI) | N/A | SWE-bench Verified ~72% | ~85% | $1.25/$10 |
Grok 4 is xAI's flagship reasoning model, released July 9-10, 2025. It pairs a 256K-token context window (text plus image input) with frontier-tier benchmark scores - 87.5% GPQA Diamond, 91.7% AIME 2025, and 72.5% SWE-bench Verified - at a comparatively low $3/$15 per million tokens. xAI markets it as a generalist reasoning engine with real-time access to the X platform, strong multilingual coverage, and a multi-agent 'Heavy' mode for the hardest queries. It undercuts Claude Opus 4 on both price and most reasoning benchmarks, though its context length and throughput lag Google's and OpenAI's top tiers.
Analysis generated: 2026-08-24