GPT-5 mini vs Gemini 3.1 Pro — Budget vs Mid-Tier AI Pricing
GPT-5 mini is 88% cheaper on input and 83% cheaper on output than Gemini 3.1 Pro. Gemini 3.1 Pro has 3.7x more context.
Pricing data verified: Jun 11, 2026
All Budget Models Compared
The cheapest AI models from major providers, ranked by input price.
| Model | Provider | Tier | Input (per 1M) | Output (per 1M) | Context |
|---|---|---|---|---|---|
| Gemini 2.0 Flash Lite | Budget | $0.075 | $0.30 | 1M | |
| GPT-5 mini | OpenAI | Budget | $0.25 | $2.00 | 272K |
| Gemini 3.5 Flash | Mid | $1.50 | $9.00 | 1M | |
| Gemini 3.1 Pro | Mid | $2.00 | $12.00 | 1M | |
| Claude Sonnet 4.6 | Anthropic | Mid | $3.00 | $15.00 | 1M |
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Which Should You Choose?
Chatbot / Customer Support
High volume, short responses. Cost per message matters most. Budget models handle most customer queries well.
Code Generation
Complex reasoning, longer outputs. Quality and accuracy matter. Both handle most coding tasks well.
Long Document Analysis
Processing large documents, legal contracts, or codebases. Context window is critical.
Multimodal Tasks
Processing images, audio, video alongside text. Native multimodal support matters.
High-Volume Data Processing
Classification, extraction, summarization at scale. Budget is tight, volume is high.
Research & Analysis
Deep research tasks requiring large context and integration with cloud infrastructure.
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Frequently Asked Questions
Is GPT-5 mini cheaper than Gemini 3.1 Pro?
Yes, GPT-5 mini is significantly cheaper than Gemini 3.1 Pro. GPT-5 mini costs $0.25/$2.00 per 1M tokens while Gemini 3.1 Pro costs $2.00/$12.00. That's 88% cheaper on input and 83% cheaper on output. At 10M tokens/month, GPT-5 mini costs $22.50 vs Gemini 3.1 Pro's $140 — saving $117.50/month.
Which is better for coding: GPT-5 mini or Gemini 3.1 Pro?
GPT-5 mini is better for most coding tasks due to its 88% lower input cost. It handles code generation, completion, and refactoring well at $0.25/$2.00 per 1M tokens. Gemini 3.1 Pro may have advantages for multimodal coding tasks (e.g., processing images of UI mockups) thanks to its native vision capabilities, but at $2.00/$12.00 it costs 8x more on input. For cost-conscious developers, GPT-5 mini is the practical choice.
What is the context window difference between GPT-5 mini and Gemini 3.1 Pro?
Gemini 3.1 Pro has a 1M token context window, while GPT-5 mini has a 272K token context window. Gemini 3.1 Pro supports 3.7x more context, which is critical for long document analysis, large codebases, and research tasks. If your workflow requires processing very large inputs, Gemini 3.1 Pro's larger context may justify the higher price.
GPT-5 mini vs Gemini 3.1 Pro for chatbots?
GPT-5 mini is the clear winner for chatbots and customer support. At $0.25/$2.00 per 1M tokens, it's 88% cheaper on input than Gemini 3.1 Pro at $2.00/$12.00. For high-volume chatbot deployments where cost per message matters most, GPT-5 mini delivers excellent value. At 1M messages/month, GPT-5 mini costs roughly $22.50 vs Gemini 3.1 Pro's $140.
When should you choose Gemini 3.1 Pro over GPT-5 mini?
Choose Gemini 3.1 Pro when you need: (1) very large context windows (1M tokens vs 272K), (2) native multimodal capabilities for vision and audio tasks, (3) deep integration with Google Cloud services and BigQuery, or (4) long document analysis that exceeds GPT-5 mini's 272K context. The 88% price premium is justified when these capabilities are essential to your workflow.