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Grok 4 Fast vs LFM3-1.7B

Grok 4 Fast leads the LLM Stats Score 31.0 to 25.0.

xAI · Liquid AI · Updated for 2026

Which is better?

Grok 4 Fast leads the overall LLM Stats Score 31.0 to 25.0, ranking #142 overall.

In the 2 individual benchmarks reported for both models, Grok 4 Fast wins 2; this is a narrower head-to-head signal than the composite indexes.

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

Choose Grok 4 Fast

  • overall performance matters — it scores 31.0 and ranks #142 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 2 of 2 exact shared results

Choose LFM3-1.7B

  • you want the most recent training data — it shipped Oct 2026
  • you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

Grok 4 Fast
xAI
LFM3-1.7B
Liquid AI
Core performance indexes
LLM Stats Score
31.0
#142
25.0
#191
Reasoning
30.0
#149
20.8
#216
Coding
18.1
#142
7.4
#218
Agents
1.9
#203
18.1
#97
Cost, coverage & limits
Benchmark wins
2 of 2
0 of 2
Input price
$0.20 / M
— / M
Output price
$0.50 / M
— / M
Context window
2,000,000
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Grok 4 Fast
LFM3-1.7B
Math
27.1#110
7.6#285
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

7 reported for Grok 4 Fast · 20 for LFM3-1.7B

2 shared

Grok 4 Fast outperforms in 2 benchmarks (GPQA, Humanity's Last Exam), while LFM3-1.7B is better at 0 benchmarks.

Grok 4 Fast significantly outperforms across most benchmarks.

Wed Nov 04 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Grok 4 Fast specifies input context (2,000,000 tokens). Only Grok 4 Fast specifies output context (30,000 tokens).

xAI
Grok 4 Fast
Input2,000,000 tokens
Output30,000 tokens
Liquid AI
LFM3-1.7B
Input- tokens
Output- tokens
Wed Nov 04 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Grok 4 Fast supports multimodal inputs, whereas LFM3-1.7B does not.

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

Grok 4 Fast

Text
Images
Audio
Video

LFM3-1.7B

Text
Images
Audio
Video

License

Usage and distribution terms

Grok 4 Fast is licensed under a proprietary license, while LFM3-1.7B uses LFM Open License v1.0.

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

Grok 4 Fast

Proprietary

Closed source

LFM3-1.7B

LFM Open License v1.0

Open weights

Release Timeline

When each model was launched

Grok 4 Fast was released on 2025-08-28, while LFM3-1.7B was released on 2026-10-27.

LFM3-1.7B is 14 months newer than Grok 4 Fast.

Grok 4 Fast

Aug 28, 2025

1.2 years ago

LFM3-1.7B

Oct 27, 2026

1 weeks ago

1.2yr newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Grok 4 Fast and LFM3-1.7B side-by-side, then vote on the output you prefer.

Grok 4 Fast
✓ Preferred
LFM3-1.7B
Open in Playground

FAQ

Common questions about Grok 4 Fast vs LFM3-1.7B.

Which is better, Grok 4 Fast or LFM3-1.7B?

Grok 4 Fast leads the LLM Stats Score 31.0 to 25.0. Grok 4 Fast is made by xAI and LFM3-1.7B is made by Liquid AI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Grok 4 Fast compare to LFM3-1.7B in benchmarks?

Grok 4 Fast scores SimpleQA: 95.0%, HMMT 2025: 93.3%, AIME 2025: 92.0%, GPQA: 85.7%, LiveCodeBench: 80.0%. LFM3-1.7B scores IFEval: 96.7%, Multi-IF: 89.1%, LiveCodeBench v6: 73.5%, IFBench: 73.0%, BFCL-V4: 71.4%.

What are the context window sizes for Grok 4 Fast and LFM3-1.7B?

Grok 4 Fast supports 2.0M tokens and LFM3-1.7B 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 Grok 4 Fast and LFM3-1.7B?

Key differences include LLM Stats Score (31.0 vs 25.0), multimodal support (yes vs no), licensing (Proprietary vs LFM Open License v1.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok 4 Fast and LFM3-1.7B?

Grok 4 Fast is developed by xAI and LFM3-1.7B is developed by Liquid AI.

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