token.app › Compare › Gemini 3.1 Pro Preview Custom Tools vs GPT-5.6 Luna

Gemini 3.1 Pro Preview Custom Tools vs GPT-5.6 Luna

GPT-5.6 Luna is 20× cheaper per token on a blended 3:1 basis. GPT-5.6 Luna accepts the larger context window (1.1M).

Head to head
Blended price uses a 3:1 input:output mix
Gemini 3.1 Pro Preview Custom ToolsGPT-5.6 Luna
ProviderGoogleOpenAI
Input $/1M$2.00$0.100
Output $/1M$12.00$0.600
Blended $/1M$4.50$0.225
Context window1.0M1.1M
Max output66K128K
ReleasedFeb 2026Jul 2026
LicenceProprietaryProprietary
Choose Gemini 3.1 Pro Preview Custom Tools if…
  • No clear advantage on the data we hold.
Choose GPT-5.6 Luna if…
  • Costs less per token — $0.225 vs $4.50 blended
  • Larger context window (1.1M)
  • Newer model (released Jul 2026)
FAQ
Which is better, Gemini 3.1 Pro Preview Custom Tools or GPT-5.6 Luna?
We do not hold independently-run benchmark scores covering both Gemini 3.1 Pro Preview Custom Tools and GPT-5.6 Luna, so we make no quality claim. Their pricing and specifications are compared on this page.
Is Gemini 3.1 Pro Preview Custom Tools cheaper than GPT-5.6 Luna?
GPT-5.6 Luna is cheaper: $0.225 versus $4.50 per million tokens blended at 3:1 input:output. Input alone: $2.00 vs $0.100. Output alone: $12.00 vs $0.600.
What context windows do Gemini 3.1 Pro Preview Custom Tools and GPT-5.6 Luna have?
Gemini 3.1 Pro Preview Custom Tools: 1,048,576 tokens. GPT-5.6 Luna: 1,050,000 tokens.
Who makes Gemini 3.1 Pro Preview Custom Tools and GPT-5.6 Luna?
Gemini 3.1 Pro Preview Custom Tools is made by Google. GPT-5.6 Luna is made by OpenAI.
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