Gemini 3.1 Pro vs Mistral Small 4 — Mid-Tier vs Budget Showdown
Mistral Small 4 is 95% cheaper on input and 97.5% cheaper on output than Gemini 3.1 Pro. But Gemini 3.1 Pro has 7.8x more context and multimodal capabilities. The ultimate mid-tier vs budget AI comparison.
Pricing data verified: Jun 21, 2026
Head-to-Head Comparison
Google's multimodal mid-tier model versus Mistral's ultra-cheap budget model.
| Feature | Gemini 3.1 Pro | Mistral Small 4 | Winner |
|---|---|---|---|
| Provider | Mistral | — | |
| Tier | Mid-Tier | Budget | — |
| Input Price (per 1M) | $2.00 | $0.10 | Mistral Small 4 |
| Output Price (per 1M) | $12.00 | $0.30 | Mistral Small 4 |
| Context Window | 1M | 128K | Gemini 3.1 Pro |
| Input Savings | — | 95% cheaper | Mistral Small 4 |
| Output Savings | — | 97.5% cheaper | Mistral Small 4 |
| Multimodal | Text, Image, Video, Audio | Text only | Gemini 3.1 Pro |
| Best For | Multimodal, long context | Cost-sensitive workloads | Depends on use case |
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When to Choose Each Model
Multimodal Workloads
Processing images, video, or audio alongside text. Gemini 3.1 Pro has native multimodal capabilities that Mistral Small 4 lacks, making it the only choice for these tasks.
Cost-Sensitive Workloads
When every dollar counts and tasks are text-only. Mistral Small 4's 95-97.5% cheaper pricing means you can process 20-40x more data for the same budget as Gemini 3.1 Pro.
Long Document Processing
Analyzing contracts, research papers, or large codebases. Gemini 3.1 Pro's 1M context window handles massive documents without chunking, though at higher cost.
High-Volume Text Processing
Classification, tagging, and content generation at scale. Mistral Small 4's $0.10/$0.30 pricing makes it perfect for processing millions of text requests affordably.
Video/Audio Analysis
Processing video content, audio transcription, or visual data. Gemini 3.1 Pro's multimodal capabilities are essential for these workloads — Mistral Small 4 can't handle them.
Batch Data Processing
Processing structured data at scale. Mistral Small 4's 97.5% cheaper output pricing ($0.30 vs $12.00) makes it the clear winner for batch workloads with high output volumes.
Frequently Asked Questions
Is Mistral Small 4 cheaper than Gemini 3.1 Pro?
Yes, significantly. Mistral Small 4 costs $0.10/$0.30 per 1M tokens while Gemini 3.1 Pro costs $2.00/$12.00. That's 95% cheaper on input and 97.5% cheaper on output. For high-volume workloads, Mistral Small 4 can be 40x cheaper overall.
Which has a larger context window?
Gemini 3.1 Pro has a 1M token context window, 7.8x larger than Mistral Small 4's 128K context window. This makes Gemini 3.1 Pro better for processing long documents, large codebases, and multimodal tasks that require extensive context.
When should I choose Gemini 3.1 Pro over Mistral Small 4?
Choose Gemini 3.1 Pro when you need multimodal capabilities, long context processing, or Google ecosystem integration. Gemini 3.1 Pro excels at processing images, video, and audio alongside text, with a full 1M context window.
When should I choose Mistral Small 4 over Gemini 3.1 Pro?
Choose Mistral Small 4 when cost is your primary concern and your tasks don't require multimodal capabilities or the full 1M context window. Mistral Small 4 is ideal for text-only high-volume workloads at $0.10/$0.30 per 1M tokens.
How much can I save switching from Gemini 3.1 Pro to Mistral Small 4?
Savings are significant. At 1M tokens/month (50% input, 50% output), Gemini 3.1 Pro costs $70.00 while Mistral Small 4 costs $0.20 — saving $69.80/month (99.7%). At 100M tokens/month, you'd save $6,980/month. The tradeoff is multimodal capability and context window size.
The Verdict
It Depends on Your Needs
Mistral Small 4's 95-97.5% cheaper pricing makes it the clear winner for cost optimization. At $0.10/$0.30 per 1M tokens, it's ideal for high-volume, text-only tasks. Gemini 3.1 Pro is the right choice when you need multimodal capabilities, 1M context, or Google ecosystem integration — but you'll pay 20-40x more for that versatility.
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