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GPT-6.1 Sol vs Kimi K2 Base

GPT-6.1 Sol leads the LLM Stats Score 53.6 to 13.0.

OpenAI · Moonshot AI · Updated for 2026

Which is better?

GPT-6.1 Sol leads the overall LLM Stats Score 53.6 to 13.0, ranking #7 overall.

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

Choose GPT-6.1 Sol

  • overall performance matters — it scores 53.6 and ranks #7 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes
  • you want the most recent training data — it shipped Sep 2026

Choose Kimi K2 Base

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

At a glance

The differences that matter most.

GPT-6.1 Sol
OpenAI
Kimi K2 Base
Moonshot AI
Core performance indexes
LLM Stats Score
53.6
#7
13.0
#270
Reasoning
51.6
#8
12.1
#268
Coding
38.6
#19
10.5
#185
Cost, coverage & limits
Benchmark wins
—
—
Input price
$2.00 / M
— / M
Output price
$10.00 / M
— / M
Context window
1,050,000
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
GPT-6.1 Sol
Kimi K2 Base
Math
34.9#48
14.2#231
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

17 reported for GPT-6.1 Sol · 13 for Kimi K2 Base

No common benchmarks found

GPT-6.1 Sol and Kimi K2 Basedon'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 GPT-6.1 Sol specifies input context (1,050,000 tokens). Only GPT-6.1 Sol specifies output context (128,000 tokens).

OpenAI
GPT-6.1 Sol
Input1,050,000 tokens
Output128,000 tokens
Moonshot AI
Kimi K2 Base
Input- tokens
Output- tokens
Thu Oct 22 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

GPT-6.1 Sol supports multimodal inputs, whereas Kimi K2 Base does not.

GPT-6.1 Sol can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT-6.1 Sol

Text
Images
Audio
Video

Kimi K2 Base

Text
Images
Audio
Video

License

Usage and distribution terms

GPT-6.1 Sol is licensed under a proprietary license, while Kimi K2 Base uses MIT.

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

GPT-6.1 Sol

Proprietary

Closed source

Kimi K2 Base

MIT

Open weights

Release Timeline

When each model was launched

GPT-6.1 Sol was released on 2026-09-29, while Kimi K2 Base was released on 2025-07-11.

GPT-6.1 Sol is 15 months newer than Kimi K2 Base.

GPT-6.1 Sol

Sep 29, 2026

3 weeks ago

1.2yr newer
Kimi K2 Base

Jul 11, 2025

1.3 years ago

Knowledge Cutoff

When training data ends

GPT-6.1 Sol has a documented knowledge cutoff of 2026-04-30, while Kimi K2 Base's cutoff date is not specified.

We can confirm GPT-6.1 Sol's training data extends to 2026-04-30, but cannot make a direct comparison without Kimi K2 Base's cutoff date.

GPT-6.1 Sol

Apr 2026

Kimi K2 Base

—

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against GPT-6.1 Sol and Kimi K2 Base side-by-side, then vote on the output you prefer.

GPT-6.1 Sol
✓ Preferred
Kimi K2 Base
Open in Playground

FAQ

Common questions about GPT-6.1 Sol vs Kimi K2 Base.

Which is better, GPT-6.1 Sol or Kimi K2 Base?

GPT-6.1 Sol leads the LLM Stats Score 53.6 to 13.0. GPT-6.1 Sol is made by OpenAI and Kimi K2 Base 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 GPT-6.1 Sol compare to Kimi K2 Base in benchmarks?

GPT-6.1 Sol scores FrontierMath Tier 4 (v2): 100.0%, HealthBench Consensus: 96.0%, MMMU-Pro: 86.0%, DeepSWE 1.1: 75.2%, SimpleQA Verified: 73.9%. Kimi K2 Base scores C-Eval: 92.5%, GSM8k: 92.1%, MMLU-redux-2.0: 90.2%, MMLU: 87.8%, TriviaQA: 85.1%.

What are the context window sizes for GPT-6.1 Sol and Kimi K2 Base?

GPT-6.1 Sol supports 1.1M tokens and Kimi K2 Base 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 GPT-6.1 Sol and Kimi K2 Base?

Key differences include LLM Stats Score (53.6 vs 13.0), multimodal support (yes vs no), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-6.1 Sol and Kimi K2 Base?

GPT-6.1 Sol is developed by OpenAI and Kimi K2 Base is developed by Moonshot AI.

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