GPT-4o Mini (07-18) vs Mistral Magistral Small 2509
GPT-4o Mini (07-18) (2024) and Mistral Magistral Small 2509 (2025) are compact production models from OpenAI and MistralAI. GPT-4o Mini (07-18) ships a 128K-token context window, while Mistral Magistral Small 2509 ships a not-yet-sourced context window. On pricing, GPT-4o Mini (07-18) costs $0.15/1M input tokens versus $0.5/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
GPT-4o Mini (07-18) is ~233% cheaper at $0.15/1M; pay for Mistral Magistral Small 2509 only for provider fit.
Specs
| Specification | ||
|---|---|---|
| Released | 2024-07-18 | 2025-09-01 |
| Context window | 128K | — |
| Parameters | — | — |
| Architecture | decoder only | - |
| License | Proprietary | Proprietary |
| Knowledge cutoff | 2023-10 | - |
Pricing and availability
| Pricing attribute | GPT-4o Mini (07-18) | Mistral Magistral Small 2509 |
|---|---|---|
| Input price | $0.15/1M tokens | $0.5/1M tokens |
| Output price | $0.6/1M tokens | $1.5/1M tokens |
| Providers |
Capabilities
| Capability | GPT-4o Mini (07-18) | Mistral Magistral Small 2509 |
|---|---|---|
| Vision | Yes | No |
| Multimodal | No | No |
| Reasoning | No | No |
| Function calling | No | No |
| Tool use | No | No |
| Structured outputs | Yes | No |
| Code execution | Yes | No |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on vision: GPT-4o Mini (07-18), structured outputs: GPT-4o Mini (07-18), and code execution: GPT-4o Mini (07-18). Both models share the core language-model surface, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, GPT-4o Mini (07-18) lists $0.15/1M input and $0.6/1M output tokens, while Mistral Magistral Small 2509 lists $0.5/1M input and $1.5/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts GPT-4o Mini (07-18) lower by about $0.51 per million blended tokens. Availability is 3 providers versus 1, so concentration risk also matters.
Choose GPT-4o Mini (07-18) when coding workflow support, lower input-token cost, and broader provider choice are central to the workload. Choose Mistral Magistral Small 2509 when provider fit are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship. This keeps the decision grounded in measurable tradeoffs instead of brand-level assumptions. It also helps separate model capability from provider packaging, which can change cost and latency.
FAQ
Which is cheaper, GPT-4o Mini (07-18) or Mistral Magistral Small 2509?
GPT-4o Mini (07-18) is cheaper on tracked token pricing. GPT-4o Mini (07-18) costs $0.15/1M input and $0.6/1M output tokens. Mistral Magistral Small 2509 costs $0.5/1M input and $1.5/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is GPT-4o Mini (07-18) or Mistral Magistral Small 2509 open source?
GPT-4o Mini (07-18) is listed under Proprietary. Mistral Magistral Small 2509 is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, GPT-4o Mini (07-18) or Mistral Magistral Small 2509?
GPT-4o Mini (07-18) has the clearer documented vision signal in this comparison. If vision is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for structured outputs, GPT-4o Mini (07-18) or Mistral Magistral Small 2509?
GPT-4o Mini (07-18) has the clearer documented structured outputs signal in this comparison. If structured outputs is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for code execution, GPT-4o Mini (07-18) or Mistral Magistral Small 2509?
GPT-4o Mini (07-18) has the clearer documented code execution signal in this comparison. If code execution is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run GPT-4o Mini (07-18) and Mistral Magistral Small 2509?
GPT-4o Mini (07-18) is available on OpenAI API, OpenRouter, and Replicate API. Mistral Magistral Small 2509 is available on AWS Bedrock. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
Continue comparing
Last reviewed: 2026-05-11. Data sourced from public model cards and provider documentation.