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Grok-4 Fast Non-Reasoning vs LFM3-1.7B

Comparing Grok-4 Fast Non-Reasoning and LFM3-1.7B across benchmarks, pricing, and capabilities.

xAI · Liquid AI · Updated for 2026

Which is better?

Grok-4 Fast Non-Reasoning and LFM3-1.7B trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.

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

Choose Grok-4 Fast Non-Reasoning

  • you want predictable pricing at $0.20/M input and $0.50/M output

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 Non-Reasoning
xAI
LFM3-1.7B
Liquid AI
Benchmark wins
—
—
Input price
$0.20 / M
— / M
Output price
$0.50 / M
— / M
Context window
2,000,000
—

Individual benchmarks

0 reported for Grok-4 Fast Non-Reasoning · 20 for LFM3-1.7B

No common benchmarks found

Grok-4 Fast Non-Reasoning and LFM3-1.7Bdon'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 Grok-4 Fast Non-Reasoning specifies input context (2,000,000 tokens). Only Grok-4 Fast Non-Reasoning specifies output context (30,000 tokens).

xAI
Grok-4 Fast Non-Reasoning
Input2,000,000 tokens
Output30,000 tokens
Liquid AI
LFM3-1.7B
Input- tokens
Output- tokens
Mon Nov 09 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

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

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

Grok-4 Fast Non-Reasoning

Text
Images
Audio
Video

LFM3-1.7B

Text
Images
Audio
Video

License

Usage and distribution terms

Grok-4 Fast Non-Reasoning 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 Non-Reasoning

Proprietary

Closed source

LFM3-1.7B

LFM Open License v1.0

Open weights

Release Timeline

When each model was launched

Grok-4 Fast Non-Reasoning 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 Non-Reasoning.

Grok-4 Fast Non-Reasoning

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 Non-Reasoning and LFM3-1.7B side-by-side, then vote on the output you prefer.

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

FAQ

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

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

Grok-4 Fast Non-Reasoning (xAI) and LFM3-1.7B (Liquid AI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

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

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 Non-Reasoning and LFM3-1.7B?

Grok-4 Fast Non-Reasoning 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 Non-Reasoning and LFM3-1.7B?

Key differences include 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 Non-Reasoning and LFM3-1.7B?

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

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