Model Comparison

Kimi-k1.5 vs Muse Spark 1.1Which is better in 2026?

Comparing Kimi-k1.5 and Muse Spark 1.1 across benchmarks, pricing, and capabilities.

Verdict: Kimi-k1.5 vs Muse Spark 1.1 — which is better?

Kimi-k1.5 (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.

Choose Kimi-k1.5 if…

  • you are already invested in the Moonshot AI ecosystem

Choose Muse Spark 1.1 if…

  • you want the most recent training data — it shipped Jul 2026

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Kimi-k1.5 and Muse Spark 1.1don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

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-k1.5
Input- tokens
Output- tokens
Meta
Muse Spark 1.1
Input1,048,576 tokens
Output131,072 tokens
Sat Jul 18 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Kimi-k1.5 and Muse Spark 1.1 support multimodal inputs.

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

Kimi-k1.5

Text
Images
Audio
Video

Muse Spark 1.1

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Kimi-k1.5

Proprietary

Closed source

Muse Spark 1.1

Proprietary

Closed source

Release Timeline

When each model was launched

Kimi-k1.5 was released on 2025-01-20, while Muse Spark 1.1 was released on 2026-07-09.

Muse Spark 1.1 is 18 months newer than Kimi-k1.5.

Kimi-k1.5

Jan 20, 2025

1.5 years ago

Muse Spark 1.1

Jul 9, 2026

1 weeks ago

1.5yr 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

No standout differentiators in the data we have for this pair.

Meta
Larger context window (1,048,576 tokens)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Kimi-k1.5 and Muse Spark 1.1 side-by-side, then vote on the output you prefer.

Kimi-k1.5
✓ Preferred
Muse Spark 1.1
Open in Playground
AI Model Comparison Table
Feature
Moonshot AI
Kimi-k1.5
Meta
Muse Spark 1.1

FAQ

Common questions about Kimi-k1.5 vs Muse Spark 1.1.

Which is better, Kimi-k1.5 or Muse Spark 1.1?

Kimi-k1.5 (Moonshot AI) and Muse Spark 1.1 (Meta) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does Kimi-k1.5 compare to Muse Spark 1.1 in benchmarks?

Kimi-k1.5 scores MATH-500: 96.2%, CLUEWSC: 91.4%, C-Eval: 88.3%, MMLU: 87.4%, IFEval: 87.2%. 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-k1.5 and Muse Spark 1.1?

Kimi-k1.5 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.

Who makes Kimi-k1.5 and Muse Spark 1.1?

Kimi-k1.5 is developed by Moonshot AI and Muse Spark 1.1 is developed by Meta.

Related comparisons