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

Gemini 3.1 Pro Preview Custom Tools vs GPT-5.6 Terra

GPT-5.6 Terra is 2.0× cheaper per token on a blended 3:1 basis. GPT-5.6 Terra 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 Terra
ProviderGoogleOpenAI
Input $/1M$2.00$1.00
Output $/1M$12.00$6.00
Blended $/1M$4.50$2.25
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 Terra if…
  • Costs less per token — $2.25 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 Terra?
We do not hold independently-run benchmark scores covering both Gemini 3.1 Pro Preview Custom Tools and GPT-5.6 Terra, 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 Terra?
GPT-5.6 Terra is cheaper: $2.25 versus $4.50 per million tokens blended at 3:1 input:output. Input alone: $2.00 vs $1.00. Output alone: $12.00 vs $6.00.
What context windows do Gemini 3.1 Pro Preview Custom Tools and GPT-5.6 Terra have?
Gemini 3.1 Pro Preview Custom Tools: 1,048,576 tokens. GPT-5.6 Terra: 1,050,000 tokens.
Who makes Gemini 3.1 Pro Preview Custom Tools and GPT-5.6 Terra?
Gemini 3.1 Pro Preview Custom Tools is made by Google. GPT-5.6 Terra is made by OpenAI.
Related comparisons
Gemini 3.1 Pro Preview Custom Tools full details GPT-5.6 Terra full details Gemini 3.1 Pro Preview Custom Tools vs Ling 3.0 Tiny (free) Gemini 3.1 Pro Preview Custom Tools vs Muse Spark 1.2 Gemini 3.1 Pro Preview Custom Tools vs Qwen3.8 Max Gemini 3.1 Pro Preview Custom Tools vs DeepSeek V4 Flash Latest Gemini 3.1 Pro Preview Custom Tools vs DeepSeek V4 Flash 0731 Gemini 3.1 Pro Preview Custom Tools vs Inkling Small