Gemini 3.5 Flash vs Mistral Small 4 — Budget AI API Pricing 2026

Requests per Day

Days per Month

Google

Gemini 3.5 Flash

$0.00

per month

Input cost

Output cost

Cost per request

Requests/month

Mistral

Mistral Small 4

Cheaper Choice

$0.00

per month

Input cost

Output cost

Cost per request

Requests/month

Other Models to Consider

DeepSeek V4 Pro

DeepSeek

$0.435 / $0.87 per 1M

1M context

GPT-5 mini

OpenAI

$0.25 / $2.00 per 1M

272K context

Gemini 2.5 Flash-Lite

Google

$0.10 / $0.40 per 1M

1M context

Which Model for Which Use Case?

Cost-Sensitive High Volume

At $0.15/$0.60, Mistral Small 4 is 93-97% cheaper than Gemini 3.5 Flash. At 100K requests/day, you'd save $135/mo vs Gemini.

Cheapest: Mistral Small 4

Long Context Tasks

Gemini 3.5 Flash's 1M context window is 8× larger than Mistral's 128K. For long documents, extensive codebases, or multi-turn conversations, Gemini handles far more context.

Better context: Gemini 3.5 Flash

Classification & Simple Tasks

For classification, sentiment analysis, and simple extraction tasks, Mistral Small 4 delivers solid quality at a fraction of the cost. Save 90%+ on high-volume classification.

Best value: Mistral Small 4

Google Cloud Integration

If you're already on Google Cloud Platform, Gemini 3.5 Flash integrates natively with Vertex AI, BigQuery ML, and other GCP services. Switching to Mistral means separate infrastructure.

Better GCP integration: Gemini 3.5 Flash

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Frequently Asked Questions

Is Mistral Small 4 cheaper than Gemini 3.5 Flash?

Yes, significantly. Mistral Small 4 costs $0.10/M input and $0.30/M output — 93% cheaper on input and 97% cheaper on output than Gemini 3.5 Flash's $1.50/M input and $9.00/M output.

Which has a larger context window?

Gemini 3.5 Flash has a 1M token context window — nearly 8× larger than Mistral Small 4's 128K. For long documents or extensive codebases, Gemini handles far more context.

When would I choose Gemini 3.5 Flash over Mistral Small 4?

Choose Gemini 3.5 Flash if you need a larger context window (1M vs 128K), Google Cloud integration, or prefer Google's ecosystem. For many tasks, the extra context justifies the higher cost.

Is Mistral Small 4 really the cheapest option?

At $0.15/$0.60 per 1M tokens, Mistral Small 4 is one of the cheapest models available. Only Gemini 2.5 Flash-Lite ($0.10/$0.40) and GPT-oss 20B ($0.08/$0.35) are in the same ballpark.