GPT-5.3 Codex vs Magistral Small
Compare OpenAI and Mistral AI AI models
Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
GPT-5.3 Codex
Magistral Small
Cost Differences
Magistral Small costs less than GPT-5.3 Codex
Feature Comparison
| Feature | GPT-5.3 Codex | Magistral Small |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Input Price | $1.75/1M tokens | $0.50/1M tokens |
| Output Price | $14.00/1M tokens | $1.50/1M tokens |
| Context Window | 256,000 tokens | 128,000 tokens |
| Max Output | 32,768 tokens | 16,384 tokens |
| Category | coding | reasoning |
| Capabilities | textcode | textreasoning |
| Release Date | 3/1/2026 | 12/15/2025 |
GPT-5.3 Codex vs Magistral Small: Which Should You Choose?
Choosing between GPT-5.3 Codex and Magistral Small depends on your priorities: cost efficiency, context length, or raw capability. Magistral Small is the more affordable option at $0.50/1M input tokens — 71% cheaper than GPT-5.3 Codex. Meanwhile, GPT-5.3 Codex offers a significantly larger context window at 256,000 tokens vs 128,000 for Magistral Small.
These models come from different providers — OpenAI and Mistral AI — which means different API ecosystems, SDKs, rate limits, and terms of service. If you're already integrated with OpenAI, switching to Mistral AIinvolves migration effort beyond just pricing. Factor in your existing infrastructure when deciding.
These models target different tiers: GPT-5.3 Codex is a coding model while Magistral Small is reasoning. This means they're optimized for different workloads. Magistral Small targets more demanding workloads, while GPT-5.3 Codex provides a cost-effective option for everyday tasks.
Output costs matter too. GPT-5.3 Codex charges $14.00/1M output tokens vs $1.50 for Magistral Small. 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 GPT-5.3 Codex when:
- • You need a larger context window (256,000 tokens)
- • You need longer outputs (up to 32,768 tokens)
- • You're already using OpenAI's API ecosystem
Choose Magistral Small when:
- • Budget is a primary concern
- • You're already using Mistral AI's API ecosystem
Try Different Scenarios
Use the calculator below to see how costs change with different usage patterns
GPT-5.3 Codex (OpenAI)
Magistral Small (Mistral AI)
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