Mistral Magistral Small 2509 vs Prompt Guard 86M
Mistral Magistral Small 2509 (2025) and Prompt Guard 86M (2024) are compact production models from MistralAI and AI at Meta. Mistral Magistral Small 2509 ships a not-yet-sourced context window, while Prompt Guard 86M ships a 512-token context window. On pricing, Prompt Guard 86M costs $0.05/1M input tokens versus $0.5/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
Prompt Guard 86M is ~900% cheaper at $0.05/1M; pay for Mistral Magistral Small 2509 only for provider fit.
Decision scorecard
Local evidence first| Signal | Mistral Magistral Small 2509 | Prompt Guard 86M |
|---|---|---|
| Decision fit | General | General |
| Context window | — | 512 |
| Cheapest output | $1.5/1M tokens | $0.05/1M tokens |
| Provider routes | 1 tracked | 1 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- 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.
- Prompt Guard 86M has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Prompt Guard 86M has the lower cheapest tracked output price at $0.05/1M tokens.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output prices on this page.
Mistral Magistral Small 2509
$775
Cheapest tracked route: AWS Bedrock
Prompt Guard 86M
$52.50
Cheapest tracked route: Microsoft Foundry
Estimated monthly gap: $723. Batch, cache, and negotiated pricing are excluded from this local estimate.
Switch friction
- No overlapping tracked provider route is sourced for Mistral Magistral Small 2509 and Prompt Guard 86M; plan for SDK, billing, or endpoint changes.
- Prompt Guard 86M is $1.45/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- No overlapping tracked provider route is sourced for Prompt Guard 86M and Mistral Magistral Small 2509; plan for SDK, billing, or endpoint changes.
- Mistral Magistral Small 2509 is $1.45/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-09-01 | 2024-07-23 |
| Context window | — | 512 |
| Parameters | — | 279M |
| Architecture | - | decoder only |
| License | Proprietary | Unknown |
| Knowledge cutoff | - | - |
Pricing and availability
| Pricing attribute | Mistral Magistral Small 2509 | Prompt Guard 86M |
|---|---|---|
| Input price | $0.5/1M tokens | $0.05/1M tokens |
| Output price | $1.5/1M tokens | $0.05/1M tokens |
| Providers |
Capabilities
| Capability | Mistral Magistral Small 2509 | Prompt Guard 86M |
|---|---|---|
| Vision | No | No |
| Multimodal | No | No |
| Reasoning | No | No |
| Function calling | No | No |
| Tool use | No | No |
| Structured outputs | No | No |
| Code execution | No | No |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint is close: both models cover the core production surface. That makes context budget, benchmark fit, and provider maturity more important than a simple checklist. If your application depends on one integration detail, verify it against the provider route you plan to use, not just the base model listing.
For cost, Mistral Magistral Small 2509 lists $0.5/1M input and $1.5/1M output tokens, while Prompt Guard 86M lists $0.05/1M input and $0.05/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Prompt Guard 86M lower by about $0.75 per million blended tokens. Availability is 1 providers versus 1, so concentration risk also matters.
Choose Mistral Magistral Small 2509 when provider fit are central to the workload. Choose Prompt Guard 86M when provider fit and lower input-token cost 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. For teams standardizing a stack, that distinction is often the difference between a benchmark win and a reliable deployment.
FAQ
Which is cheaper, Mistral Magistral Small 2509 or Prompt Guard 86M?
Prompt Guard 86M is cheaper on tracked token pricing. Mistral Magistral Small 2509 costs $0.5/1M input and $1.5/1M output tokens. Prompt Guard 86M costs $0.05/1M input and $0.05/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Mistral Magistral Small 2509 or Prompt Guard 86M open source?
Mistral Magistral Small 2509 is listed under Proprietary. Prompt Guard 86M is listed under Unknown. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Where can I run Mistral Magistral Small 2509 and Prompt Guard 86M?
Mistral Magistral Small 2509 is available on AWS Bedrock. Prompt Guard 86M is available on Microsoft Foundry. Provider coverage can affect latency, region availability, compliance posture, and fallback options. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
When should I pick Mistral Magistral Small 2509 over Prompt Guard 86M?
Prompt Guard 86M is ~900% cheaper at $0.05/1M; pay for Mistral Magistral Small 2509 only for provider fit. If your workload also depends on provider fit, start with Mistral Magistral Small 2509; if it depends on provider fit, run the same evaluation with Prompt Guard 86M.
Continue comparing
Last reviewed: 2026-05-16. Data sourced from public model cards and provider documentation.