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DeepSeek-V4.1-Flash vs Grok-4 Heavy

DeepSeek-V4.1-Flash leads the LLM Stats Score 51.8 to 40.7.

DeepSeek · xAI · Updated for 2026

Which is better?

DeepSeek-V4.1-Flash leads the overall LLM Stats Score 51.8 to 40.7, ranking #12 overall.

The models split the 2 individual benchmarks reported for both models evenly.

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

Choose DeepSeek-V4.1-Flash

  • overall performance matters — it scores 51.8 and ranks #12 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • 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-V4.1-Flash
DeepSeek
Grok-4 Heavy
xAI
Core performance indexes
LLM Stats Score
51.8
#12
40.7
#54
Reasoning
48.9
#17
39.0
#57
Coding
44.4
#5
17.7
#114
Cost, coverage & limits
Benchmark wins
1 of 2
1 of 2
Input price
$0.22 / M
— / M
Output price
$0.66 / M
— / M
Context window
1,040,000
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
DeepSeek-V4.1-Flash
Grok-4 Heavy
Math
35.2#43
41.5#6
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

20 reported for DeepSeek-V4.1-Flash · 6 for Grok-4 Heavy

2 shared

DeepSeek-V4.1-Flash outperforms in 1 benchmarks (GPQA), while Grok-4 Heavy is better at 1 benchmark (Humanity's Last Exam).

Both models are evenly matched across the benchmarks.

Sun Sep 13 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only DeepSeek-V4.1-Flash specifies input context (1,040,000 tokens). Only DeepSeek-V4.1-Flash specifies output context (393,216 tokens).

DeepSeek
DeepSeek-V4.1-Flash
Input1,040,000 tokens
Output393,216 tokens
xAI
Grok-4 Heavy
Input- tokens
Output- tokens
Sun Sep 13 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both DeepSeek-V4.1-Flash and Grok-4 Heavy support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

DeepSeek-V4.1-Flash

Text
Images
Audio
Video

Grok-4 Heavy

Text
Images
Audio
Video

License

Usage and distribution terms

DeepSeek-V4.1-Flash 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-V4.1-Flash

MIT

Open weights

Grok-4 Heavy

Proprietary

Closed source

Release Timeline

When each model was launched

DeepSeek-V4.1-Flash was released on 2026-09-10, while Grok-4 Heavy's release date is not specified.

We can confirm DeepSeek-V4.1-Flash's release timeline, but cannot make a direct age comparison without Grok-4 Heavy's release date.

DeepSeek-V4.1-Flash

Sep 10, 2026

3 days ago

Grok-4 Heavy

—

Knowledge Cutoff

When training data ends

Grok-4 Heavy has a documented knowledge cutoff of 2024-12-31, while DeepSeek-V4.1-Flash'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-V4.1-Flash's cutoff date.

DeepSeek-V4.1-Flash

—

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-V4.1-Flash and Grok-4 Heavy side-by-side, then vote on the output you prefer.

DeepSeek-V4.1-Flash
✓ Preferred
Grok-4 Heavy
Open in Playground

FAQ

Common questions about DeepSeek-V4.1-Flash vs Grok-4 Heavy.

Which is better, DeepSeek-V4.1-Flash or Grok-4 Heavy?

DeepSeek-V4.1-Flash leads the LLM Stats Score 51.8 to 40.7. DeepSeek-V4.1-Flash 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-V4.1-Flash compare to Grok-4 Heavy in benchmarks?

DeepSeek-V4.1-Flash scores CodeForces: 100.0%, GPQA: 90.9%, Terminal-Bench 2.1: 90.6%, BabyVision: 89.6%, CyberGym: 88.1%. 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-V4.1-Flash and Grok-4 Heavy?

DeepSeek-V4.1-Flash 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-V4.1-Flash and Grok-4 Heavy?

Key differences include LLM Stats Score (51.8 vs 40.7), licensing (MIT vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes DeepSeek-V4.1-Flash and Grok-4 Heavy?

DeepSeek-V4.1-Flash is developed by DeepSeek and Grok-4 Heavy is developed by xAI.

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