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GPT 6.1 Sol Pro vs Kimi K2 (0905)

At a glance

OpenAI's GPT-6.1 Sol served in pro reasoning mode for the hardest problems.

1.1M ctx$2.00/$10.00 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
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Cheaper73%
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
Input$2.00/M tokens
Output$10.00/M tokens
Cache read$0.10/M tokens
Cache write$2.50/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input70%$0.60/M tokens
Output75%$2.50/M tokens
Chat with GPT 6.1 Sol ProGo to model
Chat with Kimi K2 (0905)Go to model
Frequently Asked Questions: GPT 6.1 Sol Pro vs Kimi K2 (0905)▼

Which is better, GPT 6.1 Sol Pro or Kimi K2 (0905)?

▼

Both GPT 6.1 Sol 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 6.1 Sol Pro or Kimi K2 (0905)?

▼

Kimi K2 (0905) has a lower blended cost. GPT 6.1 Sol Pro: $2.00 input / $10.00 output. Kimi K2 (0905): $0.60 input / $2.50 output.

Which has a larger context window, GPT 6.1 Sol Pro or Kimi K2 (0905)?

▼

GPT 6.1 Sol Pro has a larger context window: GPT 6.1 Sol Pro supports 1.1M tokens vs Kimi K2 (0905) at 262K tokens.

Do both GPT 6.1 Sol Pro and Kimi K2 (0905) support vision?

▼

GPT 6.1 Sol Pro supports vision/image input, but Kimi K2 (0905) does not.

What are the key differences between GPT 6.1 Sol Pro and Kimi K2 (0905)?

▼

Key differences: Kimi K2 (0905) is significantly cheaper; only GPT 6.1 Sol Pro supports vision input; only GPT 6.1 Sol 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 6.1 Sol Pro and Kimi K2 (0905) for free on idapt.app to see which performs better for your specific needs.

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