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GPT 6 Luna Pro vs Kimi K2 (0905)

At a glance

OpenAI's GPT-6 Luna served in pro reasoning mode for the hardest problems.

1.1M ctx$0.10/$0.50 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
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Cheaper81%
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Specs
1.1M
Context
128K
Max output
Sep 2026
Released
262K
Context
98K
Max output
Sep 2025
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input83%$0.10/M tokens
Output80%$0.50/M tokens
Cache read$0.01/M tokens
Cache write$0.13/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input$0.60/M tokens
Output$2.50/M tokens
Chat with GPT 6 Luna ProGo to model
Chat with Kimi K2 (0905)Go to model
Frequently Asked Questions: GPT 6 Luna Pro vs Kimi K2 (0905)▼

Which is better, GPT 6 Luna Pro or Kimi K2 (0905)?

▼

Both GPT 6 Luna Pro 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 6 Luna Pro or Kimi K2 (0905)?

▼

GPT 6 Luna Pro has a lower blended cost. GPT 6 Luna Pro: $0.10 input / $0.50 output. Kimi K2 (0905): $0.60 input / $2.50 output.

Which has a larger context window, GPT 6 Luna Pro or Kimi K2 (0905)?

▼

GPT 6 Luna Pro has a larger context window: GPT 6 Luna Pro supports 1.1M tokens vs Kimi K2 (0905) at 262K tokens.

Do both GPT 6 Luna Pro and Kimi K2 (0905) support vision?

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GPT 6 Luna Pro supports vision/image input, but Kimi K2 (0905) does not.

What are the key differences between GPT 6 Luna Pro and Kimi K2 (0905)?

▼

Key differences: GPT 6 Luna Pro is significantly cheaper; only GPT 6 Luna Pro supports vision input; only GPT 6 Luna Pro 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 6 Luna Pro and Kimi K2 (0905) for free on idapt.app to see which performs better for your specific needs.

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