The AI arena is free today

Open Superagent

GPT-6 Luna vs Kimi-k1.5

GPT-6 Luna leads the LLM Stats Score 44.5 to 17.2.

OpenAI · Moonshot AI · Updated for 2026

Which is better?

GPT-6 Luna leads the overall LLM Stats Score 44.5 to 17.2, ranking #40 overall.

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

Choose GPT-6 Luna

  • overall performance matters — it scores 44.5 and ranks #40 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-k1.5

  • you are already invested in the Moonshot AI ecosystem

At a glance

The differences that matter most.

GPT-6 Luna
OpenAI
Kimi-k1.5
Moonshot AI
Core performance indexes
LLM Stats Score
44.5
#40
17.2
#224
Reasoning
40.0
#58
16.4
#221
Cost, coverage & limits
Benchmark wins
—
—
Input price
$0.10 / M
— / M
Output price
$0.50 / M
— / M
Context window
1,050,000
—

Individual benchmarks

5 reported for GPT-6 Luna · 9 for Kimi-k1.5

No common benchmarks found

GPT-6 Luna and Kimi-k1.5don'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 Luna specifies input context (1,050,000 tokens). Only GPT-6 Luna specifies output context (128,000 tokens).

OpenAI
GPT-6 Luna
Input1,050,000 tokens
Output128,000 tokens
Moonshot AI
Kimi-k1.5
Input- tokens
Output- tokens
Wed Sep 23 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both GPT-6 Luna and Kimi-k1.5 support multimodal inputs.

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

GPT-6 Luna

Text
Images
Audio
Video

Kimi-k1.5

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.

GPT-6 Luna

Proprietary

Closed source

Kimi-k1.5

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-6 Luna was released on 2026-09-22, while Kimi-k1.5 was released on 2025-01-20.

GPT-6 Luna is 20 months newer than Kimi-k1.5.

GPT-6 Luna

Sep 22, 2026

0 days ago

1.7yr newer
Kimi-k1.5

Jan 20, 2025

1.7 years ago

Knowledge Cutoff

When training data ends

GPT-6 Luna has a documented knowledge cutoff of 2026-05-18, while Kimi-k1.5's cutoff date is not specified.

We can confirm GPT-6 Luna's training data extends to 2026-05-18, but cannot make a direct comparison without Kimi-k1.5's cutoff date.

GPT-6 Luna

May 2026

Kimi-k1.5

—

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against GPT-6 Luna and Kimi-k1.5 side-by-side, then vote on the output you prefer.

GPT-6 Luna
✓ Preferred
Kimi-k1.5
Open in Playground

FAQ

Common questions about GPT-6 Luna vs Kimi-k1.5.

Which is better, GPT-6 Luna or Kimi-k1.5?

GPT-6 Luna leads the LLM Stats Score 44.5 to 17.2. GPT-6 Luna is made by OpenAI and Kimi-k1.5 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 Luna compare to Kimi-k1.5 in benchmarks?

GPT-6 Luna scores DeepSWE 1.1: 66.6%, OSWorld 2.0: 52.7%, Agents' Last Exam: 50.9%, FrontierCode 1.1: 42.4%, AutomationBench v1.0.6: 20.7%. Kimi-k1.5 scores MATH-500: 96.2%, CLUEWSC: 91.4%, C-Eval: 88.3%, MMLU: 87.4%, IFEval: 87.2%.

What are the context window sizes for GPT-6 Luna and Kimi-k1.5?

GPT-6 Luna supports 1.1M tokens and Kimi-k1.5 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 Luna and Kimi-k1.5?

Key differences include LLM Stats Score (44.5 vs 17.2). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-6 Luna and Kimi-k1.5?

GPT-6 Luna is developed by OpenAI and Kimi-k1.5 is developed by Moonshot AI.

Related comparisons