Model Comparison

Kimi K2-Instruct-0905 vs Muse Spark 1.1Which is better in 2026?

Muse Spark 1.1 significantly outperforms across most benchmarks.

Verdict: Kimi K2-Instruct-0905 vs Muse Spark 1.1 — which is better?

Kimi K2-Instruct-0905 (by Moonshot AI) and Muse Spark 1.1 (by Meta) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Kimi K2-Instruct-0905 outperforms in 0 benchmarks, while Muse Spark 1.1 is better at 1 benchmark (Humanity's Last Exam). Muse Spark 1.1 significantly outperforms across most benchmarks.

Choose Kimi K2-Instruct-0905 if…

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

Choose Muse Spark 1.1 if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you want the most recent training data — it shipped Jul 2026

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Kimi K2-Instruct-0905 outperforms in 0 benchmarks, while Muse Spark 1.1 is better at 1 benchmark (Humanity's Last Exam).

Muse Spark 1.1 significantly outperforms across most benchmarks.

Tue Jul 21 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Muse Spark 1.1 specifies input context (1,048,576 tokens). Only Muse Spark 1.1 specifies output context (131,072 tokens).

Moonshot AI
Kimi K2-Instruct-0905
Input- tokens
Output- tokens
Meta
Muse Spark 1.1
Input1,048,576 tokens
Output131,072 tokens
Tue Jul 21 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Muse Spark 1.1 supports multimodal inputs, whereas Kimi K2-Instruct-0905 does not.

Muse Spark 1.1 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Kimi K2-Instruct-0905

Text
Images
Audio
Video

Muse Spark 1.1

Text
Images
Audio
Video

License

Usage and distribution terms

Kimi K2-Instruct-0905 is licensed under MIT, while Muse Spark 1.1 uses a proprietary license.

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

Kimi K2-Instruct-0905

MIT

Open weights

Muse Spark 1.1

Proprietary

Closed source

Release Timeline

When each model was launched

Kimi K2-Instruct-0905 was released on 2025-09-05, while Muse Spark 1.1 was released on 2026-07-09.

Muse Spark 1.1 is 10 months newer than Kimi K2-Instruct-0905.

Kimi K2-Instruct-0905

Sep 5, 2025

10 months ago

Muse Spark 1.1

Jul 9, 2026

1 weeks ago

10mo 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?Start an Issue discussion→

Key Takeaways

Moonshot AI
Has open weights
Meta
Larger context window (1,048,576 tokens)
Supports multimodal inputs
Higher Humanity's Last Exam score (62.1% vs 4.7%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Kimi K2-Instruct-0905 and Muse Spark 1.1 side-by-side, then vote on the output you prefer.

Kimi K2-Instruct-0905
✓ Preferred
Muse Spark 1.1
Open in Playground
AI Model Comparison Table
Feature
Moonshot AI
Kimi K2-Instruct-0905
Meta
Muse Spark 1.1

FAQ

Common questions about Kimi K2-Instruct-0905 vs Muse Spark 1.1.

Which is better, Kimi K2-Instruct-0905 or Muse Spark 1.1?

Muse Spark 1.1 significantly outperforms across most benchmarks. Kimi K2-Instruct-0905 is made by Moonshot AI and Muse Spark 1.1 is made by Meta. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Kimi K2-Instruct-0905 compare to Muse Spark 1.1 in benchmarks?

Kimi K2-Instruct-0905 scores MATH-500: 97.4%, MMLU-Redux: 92.7%, IFEval: 89.8%, AutoLogi: 89.5%, MMLU: 89.5%. Muse Spark 1.1 scores CharXiv-R: 88.4%, MCP Atlas: 88.1%, OSWorld-Verified: 80.8%, Terminal-Bench 2.1: 80.0%, BabyVision: 76.3%.

What are the context window sizes for Kimi K2-Instruct-0905 and Muse Spark 1.1?

Kimi K2-Instruct-0905 supports an unknown number of tokens and Muse Spark 1.1 supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Kimi K2-Instruct-0905 and Muse Spark 1.1?

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

Who makes Kimi K2-Instruct-0905 and Muse Spark 1.1?

Kimi K2-Instruct-0905 is developed by Moonshot AI and Muse Spark 1.1 is developed by Meta.

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