Model Comparison

Kimi K2.6 vs GPT-5.6 LunaWhich is better in 2026?

GPT-5.6 Luna shows notably better performance in the majority of benchmarks. Kimi K2.6 is 1.6x cheaper per token.

Verdict: Kimi K2.6 vs GPT-5.6 Luna — which is better?

Kimi K2.6 (by Moonshot AI) and GPT-5.6 Luna (by OpenAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Kimi K2.6 outperforms in 2 benchmarks (BrowseComp, MMMU-Pro), while GPT-5.6 Luna is better at 4 benchmarks (GDPval-AA, GPQA, SWE-Bench Pro, Toolathlon). GPT-5.6 Luna shows notably better performance in the majority of benchmarks.

On price, Kimi K2.6 is roughly 1.6x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

GPT-5.6 Luna also accepts a larger context window (1,050,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose Kimi K2.6 if…

  • cost matters — it's about 1.6x cheaper per token
  • you need open weights you can self-host or fine-tune

Choose GPT-5.6 Luna if…

  • you want the strongest raw capability — it leads on 4 of 6 shared benchmarks
  • you process long inputs — it offers a 1,050,000 token context window
  • you want the most recent training data — it shipped Jul 2026

Performance Benchmarks

Comparative analysis across standard metrics

6 benchmarks

Kimi K2.6 outperforms in 2 benchmarks (BrowseComp, MMMU-Pro), while GPT-5.6 Luna is better at 4 benchmarks (GDPval-AA, GPQA, SWE-Bench Pro, Toolathlon).

GPT-5.6 Luna shows notably better performance in the majority of benchmarks.

Fri Jul 17 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Kimi K2.6 costs less

For input processing, Kimi K2.6 ($0.75/1M tokens) is 1.3x cheaper than GPT-5.6 Luna ($1.00/1M tokens).

For output processing, Kimi K2.6 ($3.50/1M tokens) is 1.7x cheaper than GPT-5.6 Luna ($6.00/1M tokens).

In conclusion, GPT-5.6 Luna is more expensive than Kimi K2.6.*

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

Lowest available price from all providers
Fri Jul 17 2026 • llm-stats.com
Moonshot AI
Kimi K2.6
Input tokens$0.75
Output tokens$3.50
Best providerDeepinfra
OpenAI
GPT-5.6 Luna
Input tokens$1.00
Output tokens$6.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GPT-5.6 Luna accepts 1,050,000 input tokens compared to Kimi K2.6's 262,144 tokens. Kimi K2.6 can generate longer responses up to 131,072 tokens, while GPT-5.6 Luna is limited to 128,000 tokens.

Moonshot AI
Kimi K2.6
Input262,144 tokens
Output131,072 tokens
OpenAI
GPT-5.6 Luna
Input1,050,000 tokens
Output128,000 tokens
Fri Jul 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Kimi K2.6 and GPT-5.6 Luna support multimodal inputs.

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

Kimi K2.6

Text
Images
Audio
Video

GPT-5.6 Luna

Text
Images
Audio
Video

License

Usage and distribution terms

Kimi K2.6 is licensed under Modified MIT License, while GPT-5.6 Luna uses a proprietary license.

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

Kimi K2.6

Modified MIT License

Open weights

GPT-5.6 Luna

Proprietary

Closed source

Release Timeline

When each model was launched

Kimi K2.6 was released on 2026-04-20, while GPT-5.6 Luna was released on 2026-07-09.

GPT-5.6 Luna is 3 months newer than Kimi K2.6.

Kimi K2.6

Apr 20, 2026

2 months ago

GPT-5.6 Luna

Jul 9, 2026

1 weeks ago

2mo newer

Knowledge Cutoff

When training data ends

GPT-5.6 Luna has a documented knowledge cutoff of 2026-02-16, while Kimi K2.6's cutoff date is not specified.

We can confirm GPT-5.6 Luna's training data extends to 2026-02-16, but cannot make a direct comparison without Kimi K2.6's cutoff date.

Kimi K2.6

—

GPT-5.6 Luna

Feb 2026

Provider Availability

Kimi K2.6 is available from DeepInfra, Fireworks, Moonshot AI, Novita, Together. GPT-5.6 Luna is available from OpenAI.

Kimi K2.6

deepinfra logo
Deepinfra
Input Price:Input: $0.75/1MOutput Price:Output: $3.50/1M
fireworks logo
Fireworks
Input Price:Input: $0.95/1MOutput Price:Output: $4.00/1M
moonshot logo
Unknown Organization
Input Price:Input: $0.95/1MOutput Price:Output: $4.00/1M
novita logo
Novita
Input Price:Input: $0.95/1MOutput Price:Output: $4.00/1M
together logo
Together
Input Price:Input: $1.20/1MOutput Price:Output: $4.50/1M

GPT-5.6 Luna

openai logo
OpenAI
Input Price:Input: $1.00/1MOutput Price:Output: $6.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Moonshot AI
Less expensive input tokens
Less expensive output tokens
Has open weights
Higher BrowseComp score (86.3% vs 83.3%)
Higher MMMU-Pro score (80.1% vs 78.4%)
OpenAI
Larger context window (1,050,000 tokens)
Higher GDPval-AA score (53.1% vs 40.1%)
Higher GPQA score (92.3% vs 90.5%)
Higher SWE-Bench Pro score (62.7% vs 58.6%)
Higher Toolathlon score (53.4% vs 50.0%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Kimi K2.6 and GPT-5.6 Luna side-by-side, then vote on the output you prefer.

Kimi K2.6
✓ Preferred
GPT-5.6 Luna
Open in Playground
AI Model Comparison Table
Feature
Moonshot AI
Kimi K2.6
OpenAI
GPT-5.6 Luna

FAQ

Common questions about Kimi K2.6 vs GPT-5.6 Luna.

Which is better, Kimi K2.6 or GPT-5.6 Luna?

GPT-5.6 Luna shows notably better performance in the majority of benchmarks. Kimi K2.6 is made by Moonshot AI and GPT-5.6 Luna is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Kimi K2.6 compare to GPT-5.6 Luna in benchmarks?

Kimi K2.6 scores V*: 96.9%, AIME 2026: 96.4%, MathVision: 93.2%, HMMT Feb 26: 92.7%, GPQA: 90.5%. GPT-5.6 Luna scores Connectors: 99.9%, HealthBench Consensus: 95.1%, GPQA: 92.3%, Search and Function-Calling: 89.7%, Capture-the-Flag Challenges (Internal): 85.2%.

Is Kimi K2.6 cheaper than GPT-5.6 Luna?

Kimi K2.6 is 1.3x cheaper for input tokens. Kimi K2.6 costs $0.75/M input and $3.50/M output via deepinfra. GPT-5.6 Luna costs $1.00/M input and $6.00/M output via openai.

What are the context window sizes for Kimi K2.6 and GPT-5.6 Luna?

Kimi K2.6 supports 262K tokens and GPT-5.6 Luna supports 1.1M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Kimi K2.6 and GPT-5.6 Luna?

Key differences include context window (262K vs 1.1M), input pricing ($0.75 vs $1.00/M), licensing (Modified MIT License vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Kimi K2.6 and GPT-5.6 Luna?

Kimi K2.6 is developed by Moonshot AI and GPT-5.6 Luna is developed by OpenAI.

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