DeepSeek V4 Pro vs Mistral Small 4 — Budget AI API Comparison 2026

Requests per Day

Days per Month

DeepSeek

DeepSeek V4 Pro

$0.00

per month

Input cost

Output cost

Cost per request

Requests/month

Mistral

Mistral Small 4

$0.00

per month

Input cost

Output cost

Cost per request

Requests/month

Other Models to Consider

GPT-5 mini

OpenAI

$0.25 / $2.00 per 1M

272K context

Gemini 3 Flash

Google

$0.50 / $3.00 per 1M

1M 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

Mistral Small 4's $0.10/M input and $0.30/M output make it the cheapest option for high-volume tasks. If you're processing millions of tokens daily, the savings are massive.

Cheapest: Mistral Small 4

Long Context Tasks

DeepSeek V4 Pro's 1M context window is 7.8× larger than Mistral's 128K. For long documents, codebases, or extended conversations, DeepSeek handles far more.

Better context: DeepSeek V4 Pro

Code Generation

DeepSeek V4 Pro excels at code generation and mathematical reasoning. If your primary use case is code-related, DeepSeek's specialized training gives it an edge.

Better for code: DeepSeek V4 Pro

European Data Compliance

Mistral is a European company (France) with EU data residency options. If GDPR compliance or European data sovereignty matters, Mistral Small 4 is the natural choice.

EU compliance: Mistral Small 4

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Frequently Asked Questions

Is Mistral Small 4 cheaper than DeepSeek V4 Pro?

Yes. Mistral Small 4 costs $0.10/M input and $0.30/M output — 77% cheaper on input and 66% cheaper on output than DeepSeek V4 Pro's $0.435/M input and $0.87/M output.

When would I choose DeepSeek V4 Pro over Mistral Small 4?

Choose DeepSeek V4 Pro if you need a larger context window (1M vs 128K), want DeepSeek's reasoning capabilities, or prefer US-hosted infrastructure via DeepSeek's API. DeepSeek also excels at code generation and mathematical reasoning.

Which model has a better context window?

DeepSeek V4 Pro has a 1M token context window — 7.8× larger than Mistral Small 4's 128K. For long documents, codebases, or extended conversations, DeepSeek V4 Pro handles far more context.

Is Mistral Small 4 good enough for production?

For many tasks like classification, extraction, and simple generation, Mistral Small 4 delivers solid quality at 66-77% lower cost. For tasks requiring larger context or DeepSeek's specific reasoning capabilities, DeepSeek V4 Pro may be worth the premium.