Gemini 3.1 Pro vs GPT-5 — Pricing Comparison 2026

Requests per Day

Days per Month

Google

Gemini 3.1 Pro

$0.00

per month

Input cost

Output cost

Cost per request

Requests/month

OpenAI

GPT-5

$0.00

per month

Input cost

Output cost

Cost per request

Requests/month

Which Model for Which Use Case?

Cost Optimization

GPT-5 at $1.25/M input is 37% cheaper than Gemini 3.1 Pro. For high-volume workloads within 272K context, GPT-5 delivers meaningful savings.

Best value: GPT-5 (17-37% cheaper)

Long Context

Gemini 3.1 Pro's 1M context window is 3.7x larger than GPT-5's 272K. For processing long documents, legal files, or codebases, Gemini 3.1 Pro is the clear winner.

Long docs: Gemini 3.1 Pro | Short context: GPT-5

Code Generation

Both models are strong at code generation. Gemini 3.1 Pro excels at complex refactoring with its larger context. GPT-5 offers better value for straightforward coding tasks.

Complex code: Gemini 3.1 Pro | Budget coding: GPT-5

Enterprise Workloads

Gemini 3.1 Pro offers Google Cloud integration with 1M context for enterprise document processing. GPT-5 provides OpenAI's ecosystem with lower costs for standard workloads.

GCP ecosystem: Gemini 3.1 Pro | OpenAI ecosystem: GPT-5

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Frequently Asked Questions

Is GPT-5 cheaper than Gemini 3.1 Pro?

Yes. GPT-5 costs $1.25/M input and $10.00/M output. Gemini 3.1 Pro costs $2.00/M input and $12.00/M output. GPT-5 is 37% cheaper on input and 17% cheaper on output. For 1M input + 500K output/month, GPT-5 costs $6.25 vs Gemini's $8.00 — saving $1.75/month (22%).

Which has a larger context window?

Gemini 3.1 Pro has a 1M token context window — 3.7x larger than GPT-5's 272K context. If you need to process long documents or maintain extensive conversation history, Gemini 3.1 Pro has a significant advantage.

When should I choose Gemini 3.1 Pro over GPT-5?

Choose Gemini 3.1 Pro when: (1) you need long context (1M vs 272K), (2) you want Google's ecosystem and GCP integration, (3) your workload involves large document processing. Choose GPT-5 when: (1) cost matters (17-37% cheaper), (2) your context fits within 272K, (3) you want OpenAI's ecosystem and tooling.

Are both models production-ready?

Both are production-ready. Gemini 3.1 Pro is Google's mid-tier model with 1M context and strong multimodal capabilities. GPT-5 is OpenAI's premium model offering excellent value at lower price points. Both handle enterprise workloads well.