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GPT 5.6 Luna vs Kimi K2 (0905)

At a glance

OpenAI's fastest, most affordable GPT-5.6 tier for high-volume, latency-sensitive work.

1.1M ctx$1.00/$6.00 per M

September 2025 checkpoint of Kimi K2 with improved capabilities.

262K ctx$0.60/$2.50 per M
Demos
All demos

No shared demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
Reasoning
CodingInsufficient data
MathInsufficient data
Sources:Provider·OpenRouter· as of 2026-07-11
Reasoning & Knowledge
Graduate Science92.3%
Agentic
Terminal Tasks84.7%
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Cheaper52%
Reasoning & Knowledge
Graduate Science—
Agentic
Terminal Tasks—
Specs
1.1M
Context
128K
Max output
Jul 2026
Released
262K
Context
100K
Max output
Sep 2025
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input$1.00/M tokens
Output$6.00/M tokens
Cache read$0.10/M tokens
Cache write$1.25/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input40%$0.60/M tokens
Output58%$2.50/M tokens
Chat with GPT 5.6 LunaGo to model
Chat with Kimi K2 (0905)Go to model
Frequently Asked Questions: GPT 5.6 Luna vs Kimi K2 (0905)▼

Which is better, GPT 5.6 Luna or Kimi K2 (0905)?

▼

Both GPT 5.6 Luna and Kimi K2 (0905) are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, GPT 5.6 Luna or Kimi K2 (0905)?

▼

Kimi K2 (0905) has a lower blended cost. GPT 5.6 Luna: $1.00 input / $6.00 output. Kimi K2 (0905): $0.60 input / $2.50 output.

Which has a larger context window, GPT 5.6 Luna or Kimi K2 (0905)?

▼

GPT 5.6 Luna has a larger context window: GPT 5.6 Luna supports 1.1M tokens vs Kimi K2 (0905) at 262K tokens.

Do both GPT 5.6 Luna and Kimi K2 (0905) support vision?

▼

GPT 5.6 Luna supports vision/image input, but Kimi K2 (0905) does not.

What are the key differences between GPT 5.6 Luna and Kimi K2 (0905)?

▼

Key differences: only GPT 5.6 Luna supports vision input; only GPT 5.6 Luna offers extended reasoning mode. Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both GPT 5.6 Luna and Kimi K2 (0905) for free on idapt.app to see which performs better for your specific needs.

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