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Kimi-k1.5 vs Kimi K3.1 Pro

Kimi K3.1 Pro leads the LLM Stats Score 55.5 to 16.7.

Moonshot AI · Moonshot AI · Updated for 2026

Which is better?

Kimi K3.1 Pro leads the overall LLM Stats Score 55.5 to 16.7, ranking #5 overall.

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

Choose Kimi-k1.5

  • you are already invested in the Moonshot AI ecosystem

Choose Kimi K3.1 Pro

  • overall performance matters — it scores 55.5 and ranks #5 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes
  • you want the most recent training data — it shipped Oct 2026

At a glance

The differences that matter most.

Kimi-k1.5
Moonshot AI
Kimi K3.1 Pro
Moonshot AI
Core performance indexes
LLM Stats Score
16.7
#254
55.5
#5
Reasoning
15.9
#251
54.3
#6
Cost, coverage & limits
Benchmark wins
—
—
Input price
— / M
$2.00 / M
Output price
— / M
$10.00 / M
Context window
—
1,048,576

Capability indexes

Additional strengths measured across groups of related public benchmarks

3 shared
Index
Kimi-k1.5
Kimi K3.1 Pro
Math
20.2#176
38.6#26
Vision
10.9#135
40.5#4
Multimodal
14.5#113
40.8#2
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

9 reported for Kimi-k1.5 · 30 for Kimi K3.1 Pro

No common benchmarks found

Kimi-k1.5 and Kimi K3.1 Prodon'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 Kimi K3.1 Pro specifies input context (1,048,576 tokens). Only Kimi K3.1 Pro specifies output context (1,048,576 tokens).

Moonshot AI
Kimi-k1.5
Input- tokens
Output- tokens
Moonshot AI
Kimi K3.1 Pro
Input1,048,576 tokens
Output1,048,576 tokens
Fri Oct 30 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Kimi-k1.5 and Kimi K3.1 Pro support multimodal inputs.

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

Kimi-k1.5

Text
Images
Audio
Video

Kimi K3.1 Pro

Text
Images
Audio
Video

Release Timeline

When each model was launched

Kimi-k1.5 was released on 2025-01-20, while Kimi K3.1 Pro was released on 2026-10-23.

Kimi K3.1 Pro is 21 months newer than Kimi-k1.5.

Kimi-k1.5

Jan 20, 2025

1.8 years ago

Kimi K3.1 Pro

Oct 23, 2026

1 weeks ago

1.8yr 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 Kimi-k1.5 and Kimi K3.1 Pro side-by-side, then vote on the output you prefer.

Kimi-k1.5
✓ Preferred
Kimi K3.1 Pro
Open in Playground

FAQ

Common questions about Kimi-k1.5 vs Kimi K3.1 Pro.

Which is better, Kimi-k1.5 or Kimi K3.1 Pro?

Kimi K3.1 Pro leads the LLM Stats Score 55.5 to 16.7. Kimi-k1.5 is made by Moonshot AI and Kimi K3.1 Pro is made by Moonshot AI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Kimi-k1.5 compare to Kimi K3.1 Pro in benchmarks?

Kimi-k1.5 scores MATH-500: 96.2%, CLUEWSC: 91.4%, C-Eval: 88.3%, MMLU: 87.4%, IFEval: 87.2%. Kimi K3.1 Pro scores BabyVision: 95.4%, GPQA: 94.2%, BenchCAD (with Python tool): 92.7%, BrowseComp: 92.1%, Chartography: 90.2%.

What are the context window sizes for Kimi-k1.5 and Kimi K3.1 Pro?

Kimi-k1.5 supports an unknown number of tokens and Kimi K3.1 Pro 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-k1.5 and Kimi K3.1 Pro?

Key differences include LLM Stats Score (16.7 vs 55.5), licensing (Proprietary vs Unknown). See the full comparison above for benchmark-by-benchmark results.

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