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 $0.50/1M for the alternative. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
GPT-4o Mini (07-18) is ~233% cheaper at $0.15/1M; pay for Mistral Magistral Small 2509 only for provider fit.
Decision scorecard
Local evidence first| Signal | GPT-4o Mini (07-18) | Mistral Magistral Small 2509 |
|---|---|---|
| Best for | multimodal apps and provider-routed production | provider-routed production |
| Decision fit | Coding, RAG, and Agents | General |
| Context window | 128k | — |
| Cheapest output | $0.60/1M tokens | $1.50/1M tokens |
| Provider routes | 3 tracked | 2 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- GPT-4o Mini (07-18) has the larger context window for long prompts, retrieval packs, or transcript analysis.
- GPT-4o Mini (07-18) has the lower cheapest tracked output price at $0.60/1M tokens.
- GPT-4o Mini (07-18) has broader tracked provider coverage for fallback and procurement flexibility.
- GPT-4o Mini (07-18) uniquely exposes Vision, Structured outputs, and Code execution in local model data.
- Local decision data tags GPT-4o Mini (07-18) for Coding, RAG, and Agents.
- Use Mistral Magistral Small 2509 when your own prompt tests beat the comparison signals; the local data does not show a decisive standalone advantage yet.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
GPT-4o Mini (07-18)
$270
Cheapest tracked route/tier: OpenAI API
Mistral Magistral Small 2509
$775
Cheapest tracked route/tier: AWS Bedrock
Estimated monthly gap: $505. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- No overlapping tracked provider route is sourced for GPT-4o Mini (07-18) and Mistral Magistral Small 2509; plan for SDK, billing, or endpoint changes.
- Mistral Magistral Small 2509 is $0.90/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Check replacement coverage for Vision, Structured outputs, and Code execution before moving production traffic.
- No overlapping tracked provider route is sourced for Mistral Magistral Small 2509 and GPT-4o Mini (07-18); plan for SDK, billing, or endpoint changes.
- GPT-4o Mini (07-18) is $0.90/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- GPT-4o Mini (07-18) adds Vision, Structured outputs, and Code execution in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2024-07-18 | 2025-09-01 |
| Context window | 128k | — |
| Parameters | — | 24B |
| Architecture | Decoder Only | - |
| License | Proprietary | Apache 2.0OSI-approved |
| Openness | Proprietary | Open source |
| Commercial use | Commercial use: conditional | Commercial use: permitted |
| Knowledge cutoff | 2023-10 | - |
Pricing and availability
| Pricing attribute | GPT-4o Mini (07-18) | Mistral Magistral Small 2509 |
|---|---|---|
| Input price | $0.15/1M tokens | $0.50/1M tokens |
| Output price | $0.60/1M tokens | $1.50/1M 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 |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark scores are currently available 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 $0.60/1M output tokens on the cheapest tracked provider, while Mistral Magistral Small 2509 lists $0.50/1M input and $1.50/1M 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 2, 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.
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 $0.60/1M output tokens. Mistral Magistral Small 2509 costs $0.50/1M input and $1.50/1M 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 Apache 2.0. 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 and Vercel AI Gateway. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-06-15. Data sourced from public model cards and provider documentation.