Magistral Small vs o3-pro
Compare Mistral AI and OpenAI AI models
Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
Magistral Small
o3-pro
Cost Differences
o3-pro costs more than Magistral Small
Feature Comparison
| Feature | Magistral Small | o3-pro |
|---|---|---|
| Provider | Mistral AI | OpenAI |
| Input Price | $0.50/1M tokens | $20.00/1M tokens |
| Output Price | $1.50/1M tokens | $80.00/1M tokens |
| Context Window | 128,000 tokens | 1,000,000 tokens |
| Max Output | 16,384 tokens | 131,072 tokens |
| Category | reasoning | reasoning |
| Capabilities | textreasoning | textreasoningcode |
| Release Date | 12/15/2025 | 6/10/2025 |
Magistral Small vs o3-pro: Which Should You Choose?
Choosing between Magistral Small and o3-pro depends on your priorities: cost efficiency, context length, or raw capability. Magistral Small is the more affordable option at $0.50/1M input tokens — 98% cheaper than o3-pro. Meanwhile, o3-pro offers a significantly larger context window at 1,000,000 tokens vs 128,000 for Magistral Small.
These models come from different providers — Mistral AI and OpenAI — which means different API ecosystems, SDKs, rate limits, and terms of service. If you're already integrated with Mistral AI, switching to OpenAIinvolves migration effort beyond just pricing. Factor in your existing infrastructure when deciding.
Both models are in the reasoning category, making this a direct head-to-head comparison. At scale — say 10,000 requests per day — the cost difference adds up: Magistral Small would save you roughly $17,625.00/month compared to o3-pro. For startups and indie developers, that difference can be significant.
Output costs matter too. Magistral Small charges $1.50/1M output tokens vs $80.00 for o3-pro. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. Magistral Small has the edge here at $1.50/1M output tokens.
Best Use Cases
Choose Magistral Small when:
- • Budget is a primary concern
- • You're already using Mistral AI's API ecosystem
Choose o3-pro when:
- • You need a larger context window (1,000,000 tokens)
- • You need more capabilities (code)
- • You need longer outputs (up to 131,072 tokens)
- • You're already using OpenAI's API ecosystem
Try Different Scenarios
Use the calculator below to see how costs change with different usage patterns
Magistral Small (Mistral AI)
o3-pro (OpenAI)
Start using Magistral Small today
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