GPT-4o vs Mistral Medium 3.5
OpenAI vs Mistral — Mistral Medium 3.5 is 40% cheaper on input and 25% cheaper on output, with the same 128K context.
Pricing data verified: Jun 10, 2026
| Specification | GPT-4o | Mistral Medium 3.5 |
|---|---|---|
| Input Price (per 1M tokens) | $2.50 | $1.50 |
| Output Price (per 1M tokens) | $10.00 | $7.50 |
| Context Window | 128K tokens | 128K tokens |
| Tier | Mid | Mid |
| Provider | OpenAI | Mistral |
| Cost at 1M input + 500K output | $7.50 | $5.25 |
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Which Model for Which Use Case?
EU Data Sovereignty
Mistral is a French company with EU-based infrastructure. If data sovereignty matters, Mistral Medium 3.5 provides GDPR compliance out of the box.
Cost-Conscious Mid-Tier
Mistral Medium 3.5 at $1.50/M input is 40% cheaper than GPT-4o. For teams wanting mid-tier quality at budget pricing, Mistral delivers.
OpenAI Ecosystem
GPT-4o integrates with OpenAI's full ecosystem — plugins, function calling, and widespread third-party support. If your stack is OpenAI-based, GPT-4o is the natural choice.
Performance per Dollar
Both are mid-tier models with 128K context. Mistral delivers similar capabilities at 25-40% lower cost. For startups maximizing value, Mistral wins.
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Frequently Asked Questions
Is Mistral Medium 3.5 cheaper than GPT-4o?
Yes. Mistral Medium 3.5 costs $1.50/M input and $7.50/M output. GPT-4o costs $2.50/M input and $10.00/M output. Mistral is 40% cheaper on input and 25% cheaper on output. For 1M input + 500K output/month, Mistral costs $5.25 vs GPT-4o's $7.50 — saving $2.25/month (30%).
Which has a larger context window?
Both models offer a 128K token context window. Neither has an advantage in context size.
When should I choose GPT-4o over Mistral Medium 3.5?
Choose GPT-4o when: (1) you need OpenAI's ecosystem, (2) your workload benefits from GPT-4o's training, (3) you want broader availability. Choose Mistral Medium 3.5 when: (1) cost matters (25-40% cheaper), (2) you want an EU-based provider, (3) Mistral's capabilities meet your needs.
Are both models production-ready?
Both support production workloads. GPT-4o is OpenAI's proven mid-tier model. Mistral Medium 3.5 offers competitive performance at 25-40% lower cost with EU data sovereignty.