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GPT-6.1 Sol vs Kimi K3.1 Pro

GPT-6.1 Sol and Kimi K3.1 Pro are closely matched at 53.3 and 55.5 on the LLM Stats Score. GPT-6.1 Sol and Kimi K3.1 Pro cost the same.

OpenAI · Moonshot AI · Updated for 2026

Which is better?

GPT-6.1 Sol and Kimi K3.1 Pro are closely matched on the overall LLM Stats Score at 53.3 and 55.5.

The models split the 4 individual benchmarks reported for both models evenly.

GPT-6.1 Sol also accepts a larger context window (1,050,000 input tokens), making it the stronger choice for long documents and large codebases.

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

Choose GPT-6.1 Sol

  • you process long inputs — it offers a 1,050,000 token context window

Choose Kimi K3.1 Pro

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

At a glance

The differences that matter most.

GPT-6.1 Sol
OpenAI
Kimi K3.1 Pro
Moonshot AI
Core performance indexes
LLM Stats Score
53.3
#9
55.5
#5
Reasoning
50.8
#10
54.3
#6
Coding
39.5
#18
42.7
#9
Agents
38.4
#15
41.6
#5
Cost, coverage & limits
Benchmark wins
2 of 4
2 of 4
Input price
$2.00 / M
$2.00 / M
Output price
$10.00 / M
$10.00 / M
Context window
1,050,000
1,048,576

Capability indexes

Additional strengths measured across groups of related public benchmarks

4 shared
Index
GPT-6.1 Sol
Kimi K3.1 Pro
Math
35.0#49
38.6#26
Vision
36.0#11
40.5#4
Tool use
23.7#49
30.4#14
Multimodal
35.5#13
40.8#2
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

17 reported for GPT-6.1 Sol · 30 for Kimi K3.1 Pro

4 shared

GPT-6.1 Sol outperforms in 2 benchmarks (MMMU-Pro, Terminal-Bench-Science 0.1), while Kimi K3.1 Pro is better at 2 benchmarks (APEX-Agents, GDP.pdf).

Both models are evenly matched across the benchmarks.

Thu Oct 29 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

For input processing, GPT-6.1 Sol ($2.00/1M tokens) costs the same as Kimi K3.1 Pro ($2.00/1M tokens).

For output processing, GPT-6.1 Sol ($10.00/1M tokens) costs the same as Kimi K3.1 Pro ($10.00/1M tokens).

In conclusion, GPT-6.1 Sol and Kimi K3.1 Pro cost the same.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Thu Oct 29 2026 • llm-stats.com
OpenAI
GPT-6.1 Sol
Input tokens$2.00
Output tokens$10.00
Best providerOpenAI
Moonshot AI
Kimi K3.1 Pro
Input tokens$2.00
Output tokens$10.00
Best providerUnknown Organization
Notice missing or incorrect data?

Context Window

Maximum input and output token capacity

GPT-6.1 Sol accepts 1,050,000 input tokens compared to Kimi K3.1 Pro's 1,048,576 tokens. Kimi K3.1 Pro can generate longer responses up to 1,048,576 tokens, while GPT-6.1 Sol is limited to 128,000 tokens.

OpenAI
GPT-6.1 Sol
Input1,050,000 tokens
Output128,000 tokens
Moonshot AI
Kimi K3.1 Pro
Input1,048,576 tokens
Output1,048,576 tokens
Thu Oct 29 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both GPT-6.1 Sol and Kimi K3.1 Pro support multimodal inputs.

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

GPT-6.1 Sol

Text
Images
Audio
Video

Kimi K3.1 Pro

Text
Images
Audio
Video

Release Timeline

When each model was launched

GPT-6.1 Sol was released on 2026-09-29, while Kimi K3.1 Pro was released on 2026-10-23.

Kimi K3.1 Pro is 1 month newer than GPT-6.1 Sol.

GPT-6.1 Sol

Sep 29, 2026

3 weeks ago

Kimi K3.1 Pro

Oct 23, 2026

2 days ago

3w newer

Knowledge Cutoff

When training data ends

GPT-6.1 Sol has a documented knowledge cutoff of 2026-04-30, while Kimi K3.1 Pro'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 K3.1 Pro's cutoff date.

GPT-6.1 Sol

Apr 2026

Kimi K3.1 Pro

—

Provider Availability

GPT-6.1 Sol is available from OpenAI. Kimi K3.1 Pro is available from Moonshot AI.

GPT-6.1 Sol

openai logo
OpenAI
Input Price:Input: $2.00/1MOutput Price:Output: $10.00/1M

Kimi K3.1 Pro

moonshot logo
Unknown Organization
Input Price:Input: $2.00/1MOutput Price:Output: $10.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against GPT-6.1 Sol and Kimi K3.1 Pro side-by-side, then vote on the output you prefer.

GPT-6.1 Sol
✓ Preferred
Kimi K3.1 Pro
Open in Playground

FAQ

Common questions about GPT-6.1 Sol vs Kimi K3.1 Pro.

Which is better, GPT-6.1 Sol or Kimi K3.1 Pro?

GPT-6.1 Sol and Kimi K3.1 Pro are closely matched on the LLM Stats Score at 53.3 and 55.5. GPT-6.1 Sol is made by OpenAI 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 GPT-6.1 Sol compare to Kimi K3.1 Pro 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 K3.1 Pro scores BabyVision: 95.4%, GPQA: 94.2%, BenchCAD (with Python tool): 92.7%, BrowseComp: 92.1%, Chartography: 90.2%.

Is GPT-6.1 Sol cheaper than Kimi K3.1 Pro?

Both models cost $2.00 per million input tokens.

What are the context window sizes for GPT-6.1 Sol and Kimi K3.1 Pro?

GPT-6.1 Sol supports 1.1M 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 GPT-6.1 Sol and Kimi K3.1 Pro?

Key differences include LLM Stats Score (53.3 vs 55.5), context window (1.1M vs 1.0M), licensing (Proprietary vs Unknown). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-6.1 Sol and Kimi K3.1 Pro?

GPT-6.1 Sol is developed by OpenAI and Kimi K3.1 Pro is developed by Moonshot AI.

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