GPT-5 mini vs Mistral Small 4
OpenAI vs Mistral — Mistral Small 4 is 60% cheaper on input and 85% cheaper on output. Two of the cheapest capable models in 2026.
Pricing data verified: Jun 21, 2026
| Specification | GPT-5 mini | Mistral Small 4 |
|---|---|---|
| Input Price (per 1M tokens) | $0.25 | $0.10 |
| Output Price (per 1M tokens) | $2.00 | $0.30 |
| Context Window | 272K tokens | 128K tokens |
| Tier | Budget | Budget |
| Provider | OpenAI | Mistral |
| Input Savings | Baseline | 60% cheaper |
| Output Savings | Baseline | 85% cheaper |
| Cost at 1M input + 500K output | $1.25 | $0.25 |
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Which Model for Which Use Case?
Ultra-Budget High Volume
Mistral Small 4 at $0.10/M input and $0.30/M output is one of the cheapest capable models available. For high-volume chatbots, content filtering, and data processing, Mistral delivers 60-85% savings over GPT-5 mini.
Long Context Needs
GPT-5 mini offers a 272K context window — more than double Mistral Small 4's 128K. For document analysis, long conversations, or processing large codebases, the extra context may justify the higher cost.
OpenAI Ecosystem
If you're already using OpenAI's API, GPT-5 mini integrates seamlessly with existing tooling, function calling, and structured outputs. The ecosystem familiarity can reduce development time.
Startup MVPs & Cost Optimization
At $0.25 for 1M input + 500K output, Mistral Small 4 lets you run 5x more experiments than GPT-5 mini ($1.25) for the same budget. Perfect for iterating quickly on a tight budget.
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Frequently Asked Questions
Is Mistral Small 4 cheaper than GPT-5 mini?
Yes. Mistral Small 4 costs $0.10/M input (60% cheaper than GPT-5 mini's $0.25) and $0.30/M output (85% cheaper than GPT-5 mini's $2.00). For output-heavy workloads, Mistral Small 4 is roughly 7x cheaper.
How much would I save switching from GPT-5 mini to Mistral Small 4?
For a workload of 1M input + 500K output tokens/month, GPT-5 mini costs $1.25 vs Mistral Small 4's $0.25 — saving $1.00/month (80%). At scale (10M input + 5M output), you save $10/month — $120/year.
What's the quality difference between GPT-5 mini and Mistral Small 4?
GPT-5 mini offers OpenAI's quality at a budget price with a larger 272K context window. Mistral Small 4 is optimized for speed and cost with a 128K context window. Both handle chat, summarization, and basic coding well. GPT-5 mini has the edge on complex reasoning; Mistral Small 4 wins on raw cost efficiency.
When should I choose GPT-5 mini over Mistral Small 4?
Choose GPT-5 mini when: (1) you need a larger context window (272K vs 128K), (2) you prefer OpenAI's ecosystem and tooling, (3) you need slightly better reasoning quality. Choose Mistral Small 4 when: (1) cost is the top priority, (2) 128K context is sufficient, (3) you want 60-85% savings on every request.