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DeepSeek-V4-Flash-0731 vs Grok-4 Heavy

DeepSeek-V4-Flash-0731 and Grok-4 Heavy are closely matched at 44.7 and 40.7 on the LLM Stats Score.

DeepSeek · xAI · Updated for 2026

Which is better?

DeepSeek-V4-Flash-0731 and Grok-4 Heavy are closely matched on the overall LLM Stats Score at 44.7 and 40.7.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose DeepSeek-V4-Flash-0731

  • you need open weights you can self-host or fine-tune

Choose Grok-4 Heavy

  • you are already invested in the xAI ecosystem

At a glance

The differences that matter most.

DeepSeek-V4-Flash-0731
DeepSeek
Grok-4 Heavy
xAI
Core performance indexes
LLM Stats Score
44.7
#35
40.7
#54
Reasoning
42.3
#45
39.0
#57
Coding
33.0
#36
17.7
#114
Cost, coverage & limits
Benchmark wins
—
—
Input price
$0.06 / M
— / M
Output price
$0.18 / M
— / M
Context window
1,048,576
—

Individual benchmarks

9 reported for DeepSeek-V4-Flash-0731 · 6 for Grok-4 Heavy

No common benchmarks found

DeepSeek-V4-Flash-0731 and Grok-4 Heavydon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only DeepSeek-V4-Flash-0731 specifies input context (1,048,576 tokens). Only DeepSeek-V4-Flash-0731 specifies output context (1,048,576 tokens).

DeepSeek
DeepSeek-V4-Flash-0731
Input1,048,576 tokens
Output1,048,576 tokens
xAI
Grok-4 Heavy
Input- tokens
Output- tokens
Thu Sep 10 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Grok-4 Heavy supports multimodal inputs, whereas DeepSeek-V4-Flash-0731 does not.

Grok-4 Heavy can handle both text and other forms of data like images, making it suitable for multimodal applications.

DeepSeek-V4-Flash-0731

Text
Images
Audio
Video

Grok-4 Heavy

Text
Images
Audio
Video

License

Usage and distribution terms

DeepSeek-V4-Flash-0731 is licensed under MIT, while Grok-4 Heavy uses a proprietary license.

License differences may affect how you can use these models in commercial or open-source projects.

DeepSeek-V4-Flash-0731

MIT

Open weights

Grok-4 Heavy

Proprietary

Closed source

Release Timeline

When each model was launched

DeepSeek-V4-Flash-0731 was released on 2026-07-31, while Grok-4 Heavy's release date is not specified.

We can confirm DeepSeek-V4-Flash-0731's release timeline, but cannot make a direct age comparison without Grok-4 Heavy's release date.

DeepSeek-V4-Flash-0731

Jul 31, 2026

1 months ago

Grok-4 Heavy

—

Knowledge Cutoff

When training data ends

Grok-4 Heavy has a documented knowledge cutoff of 2024-12-31, while DeepSeek-V4-Flash-0731's cutoff date is not specified.

We can confirm Grok-4 Heavy's training data extends to 2024-12-31, but cannot make a direct comparison without DeepSeek-V4-Flash-0731's cutoff date.

DeepSeek-V4-Flash-0731

—

Grok-4 Heavy

Dec 2024

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against DeepSeek-V4-Flash-0731 and Grok-4 Heavy side-by-side, then vote on the output you prefer.

DeepSeek-V4-Flash-0731
✓ Preferred
Grok-4 Heavy
Open in Playground

FAQ

Common questions about DeepSeek-V4-Flash-0731 vs Grok-4 Heavy.

Which is better, DeepSeek-V4-Flash-0731 or Grok-4 Heavy?

DeepSeek-V4-Flash-0731 and Grok-4 Heavy are closely matched on the LLM Stats Score at 44.7 and 40.7. DeepSeek-V4-Flash-0731 is made by DeepSeek and Grok-4 Heavy is made by xAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does DeepSeek-V4-Flash-0731 compare to Grok-4 Heavy in benchmarks?

DeepSeek-V4-Flash-0731 scores Terminal-Bench 2.1: 82.7%, CyberGym: 76.7%, Toolathlon: 70.3%, DSBench-FullStack: 68.7%, DSBench-Hard: 59.6%. Grok-4 Heavy scores AIME 2025: 100.0%, HMMT25: 96.7%, GPQA: 88.4%, LiveCodeBench: 79.4%, USAMO25: 61.9%.

What are the context window sizes for DeepSeek-V4-Flash-0731 and Grok-4 Heavy?

DeepSeek-V4-Flash-0731 supports 1.0M tokens and Grok-4 Heavy supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between DeepSeek-V4-Flash-0731 and Grok-4 Heavy?

Key differences include LLM Stats Score (44.7 vs 40.7), multimodal support (no vs yes), licensing (MIT vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes DeepSeek-V4-Flash-0731 and Grok-4 Heavy?

DeepSeek-V4-Flash-0731 is developed by DeepSeek and Grok-4 Heavy is developed by xAI.

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