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GPT-4 Turbo vs Kimi K2 Base

GPT-4 Turbo and Kimi K2 Base are closely matched at 9.1 and 13.6 on the LLM Stats Score.

OpenAI · Moonshot AI · Updated for 2026

Which is better?

GPT-4 Turbo and Kimi K2 Base are closely matched on the overall LLM Stats Score at 9.1 and 13.6.

In the 3 individual benchmarks reported for both models, Kimi K2 Base wins 2; this is a narrower head-to-head signal than the composite indexes.

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

Choose GPT-4 Turbo

  • you want predictable pricing at $10.00/M input and $30.00/M output

Choose Kimi K2 Base

  • you value its reported benchmark strengths — it wins 2 of 3 exact shared results
  • you want the most recent training data — it shipped Jul 2025
  • you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

GPT-4 Turbo
OpenAI
Kimi K2 Base
Moonshot AI
Core performance indexes
LLM Stats Score
9.1
#269
13.6
#242
Reasoning
9.2
#264
12.7
#240
Coding
7.2
#184
10.6
#161
Cost, coverage & limits
Benchmark wins
1 of 3
2 of 3
Input price
$10.00 / M
— / M
Output price
$30.00 / M
— / M
Context window
128,000
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
GPT-4 Turbo
Kimi K2 Base
Math
17.2#196
14.3#218
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

6 reported for GPT-4 Turbo · 13 for Kimi K2 Base

3 shared

GPT-4 Turbo outperforms in 1 benchmarks (MATH), while Kimi K2 Base is better at 2 benchmarks (GPQA, MMLU).

Kimi K2 Base shows notably better performance in the majority of benchmarks.

Wed Sep 09 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only GPT-4 Turbo specifies input context (128,000 tokens). Only GPT-4 Turbo specifies output context (4,096 tokens).

OpenAI
GPT-4 Turbo
Input128,000 tokens
Output4,096 tokens
Moonshot AI
Kimi K2 Base
Input- tokens
Output- tokens
Wed Sep 09 2026 • llm-stats.com

License

Usage and distribution terms

GPT-4 Turbo 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-4 Turbo

Proprietary

Closed source

Kimi K2 Base

MIT

Open weights

Release Timeline

When each model was launched

GPT-4 Turbo was released on 2024-04-09, while Kimi K2 Base was released on 2025-07-11.

Kimi K2 Base is 15 months newer than GPT-4 Turbo.

GPT-4 Turbo

Apr 9, 2024

2.4 years ago

Kimi K2 Base

Jul 11, 2025

1.2 years ago

1.3yr newer

Knowledge Cutoff

When training data ends

GPT-4 Turbo has a documented knowledge cutoff of 2023-12-31, while Kimi K2 Base's cutoff date is not specified.

We can confirm GPT-4 Turbo's training data extends to 2023-12-31, but cannot make a direct comparison without Kimi K2 Base's cutoff date.

GPT-4 Turbo

Dec 2023

Kimi K2 Base

—

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against GPT-4 Turbo and Kimi K2 Base side-by-side, then vote on the output you prefer.

GPT-4 Turbo
✓ Preferred
Kimi K2 Base
Open in Playground

FAQ

Common questions about GPT-4 Turbo vs Kimi K2 Base.

Which is better, GPT-4 Turbo or Kimi K2 Base?

GPT-4 Turbo and Kimi K2 Base are closely matched on the LLM Stats Score at 9.1 and 13.6. GPT-4 Turbo 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-4 Turbo compare to Kimi K2 Base in benchmarks?

GPT-4 Turbo scores MGSM: 88.5%, HumanEval: 87.1%, MMLU: 86.5%, DROP: 86.0%, MATH: 72.6%. 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-4 Turbo and Kimi K2 Base?

GPT-4 Turbo supports 128K 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-4 Turbo and Kimi K2 Base?

Key differences include LLM Stats Score (9.1 vs 13.6), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-4 Turbo and Kimi K2 Base?

GPT-4 Turbo is developed by OpenAI and Kimi K2 Base is developed by Moonshot AI.

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