Back to Value Frontier

OpenAI: GPT-5 Nano vs Google: Gemini 3.1 Pro Preview Custom Tools

Head-to-head API cost, context, and performance comparison. Synced at 11:16:58 AM.

Executive Summary

When evaluating OpenAI: GPT-5 Nano against Google: Gemini 3.1 Pro Preview Custom Tools, the pricing structure is a key differentiator. OpenAI: GPT-5 Nano is approximately 97% more cost-effective per 1 million tokens overall.

However, when looking at raw reasoning capabilities, Google: Gemini 3.1 Pro Preview Custom Tools leads with a statistical ELO score of 1300. For tasks involving complex logic, coding, or instruction-following, developers might prefer Google: Gemini 3.1 Pro Preview Custom Tools, provided their budget allows for the API burn rate.

Arbitrage Alert

You are losing 97%
per million tokens by hardcoding Google: Gemini 3.1 Pro Preview Custom Tools.

Stop guessing exactly which model to route to. Deploy the 0ms Intelligence Engine to automatically arbitrage this 97% gap in your production environment instantly.

97% Instant Profit Margin Recovery
Node.js Enterprise SDK included

Raw Technical comparison

Metric
OpenAI: GPT-5 Nano
Google: Gemini 3.1 Pro Preview Custom Tools
Performance (ELO)
1300
1300
Input Cost / 1M
$0.05
$2.00
Output Cost / 1M
$0.40
$12.00
Context Window
400,000 tokens
1,048,576 tokens

Verdict

If you are looking for pure performance and capability, Tie is statistically superior. However, if API burn rate is the primary concern, OpenAI: GPT-5 Nano wins out aggressively in pricing.

People Also Ask

Is OpenAI: GPT-5 Nano cheaper than Google: Gemini 3.1 Pro Preview Custom Tools?

Yes. OpenAI: GPT-5 Nano is cheaper for both input and output generation compared to Google: Gemini 3.1 Pro Preview Custom Tools. Exploring alternatives often yields cost reductions.

Which model has the larger context window?

The Google: Gemini 3.1 Pro Preview Custom Tools model has the advantage in memory, offering a massive 1,048,576 token limit for document ingestion.

Related Comparisons

Compare OpenAI: GPT-5 Nano vs Google: Gemma 3n 2B (free)Compare OpenAI: GPT-5 Nano vs Google: Gemma 3n 4B (free)Compare OpenAI: GPT-5 Nano vs Meta: Llama 3.3 70B Instruct (free)Compare OpenAI: GPT-5 Nano vs Nous: Hermes 3 405B Instruct (free)