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Claude Mythos 5.1 vs LFM3-1.7B

Claude Mythos 5.1 leads the LLM Stats Score 44.1 to 25.0.

Anthropic · Liquid AI · Updated for 2026

Which is better?

Claude Mythos 5.1 leads the overall LLM Stats Score 44.1 to 25.0, ranking #53 overall.

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

Choose Claude Mythos 5.1

  • overall performance matters — it scores 44.1 and ranks #53 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes

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.

Claude Mythos 5.1
Anthropic
LFM3-1.7B
Liquid AI
Core performance indexes
LLM Stats Score
44.1
#53
25.0
#191
Reasoning
42.8
#57
20.8
#216
Coding
36.5
#34
7.4
#218
Agents
34.6
#34
18.1
#97
Cost, coverage & limits
Benchmark wins
—
—
Input price
$10.00 / M
— / M
Output price
$50.00 / M
— / M
Context window
1,000,000
—

Individual benchmarks

1 reported for Claude Mythos 5.1 · 20 for LFM3-1.7B

No common benchmarks found

Claude Mythos 5.1 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 Claude Mythos 5.1 specifies input context (1,000,000 tokens). Only Claude Mythos 5.1 specifies output context (128,000 tokens).

Anthropic
Claude Mythos 5.1
Input1,000,000 tokens
Output128,000 tokens
Liquid AI
LFM3-1.7B
Input- tokens
Output- tokens
Sun Nov 08 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Claude Mythos 5.1 supports multimodal inputs, whereas LFM3-1.7B does not.

Claude Mythos 5.1 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Mythos 5.1

Text
Images
Audio
Video

LFM3-1.7B

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Mythos 5.1 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.

Claude Mythos 5.1

Proprietary

Closed source

LFM3-1.7B

LFM Open License v1.0

Open weights

Release Timeline

When each model was launched

Claude Mythos 5.1 was released on 2026-09-01, while LFM3-1.7B was released on 2026-10-27.

LFM3-1.7B is 2 months newer than Claude Mythos 5.1.

Claude Mythos 5.1

Sep 1, 2026

2 months ago

LFM3-1.7B

Oct 27, 2026

1 weeks ago

1mo 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 Claude Mythos 5.1 and LFM3-1.7B side-by-side, then vote on the output you prefer.

Claude Mythos 5.1
✓ Preferred
LFM3-1.7B
Open in Playground

FAQ

Common questions about Claude Mythos 5.1 vs LFM3-1.7B.

Which is better, Claude Mythos 5.1 or LFM3-1.7B?

Claude Mythos 5.1 leads the LLM Stats Score 44.1 to 25.0. Claude Mythos 5.1 is made by Anthropic 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 Claude Mythos 5.1 compare to LFM3-1.7B in benchmarks?

Claude Mythos 5.1 scores Terminal-Bench 4.0: 60.9%. 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 Claude Mythos 5.1 and LFM3-1.7B?

Claude Mythos 5.1 supports 1.0M 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 Claude Mythos 5.1 and LFM3-1.7B?

Key differences include LLM Stats Score (44.1 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 Claude Mythos 5.1 and LFM3-1.7B?

Claude Mythos 5.1 is developed by Anthropic and LFM3-1.7B is developed by Liquid AI.

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