OpenAI GPT OSS Safeguard 120B vs Mistral Magistral Small 2509
OpenAI GPT OSS Safeguard 120B (2025) and Mistral Magistral Small 2509 (2025) are general-purpose language models from OpenAI and MistralAI. OpenAI GPT OSS Safeguard 120B ships a not-yet-sourced context window, while Mistral Magistral Small 2509 ships a not-yet-sourced context window. On pricing, OpenAI GPT OSS Safeguard 120B 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.
OpenAI GPT OSS Safeguard 120B is ~233% cheaper at $0.15/1M; pay for Mistral Magistral Small 2509 only for provider fit.
Decision scorecard
Local evidence first| Signal | OpenAI GPT OSS Safeguard 120B | Mistral Magistral Small 2509 |
|---|---|---|
| Best for | general production evaluation | provider-routed production |
| Decision fit | Classification and JSON / Tool use | General |
| Context window | — | — |
| Cheapest output | $0.60/1M tokens | $1.50/1M tokens |
| Provider routes | 1 tracked | 2 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- OpenAI GPT OSS Safeguard 120B has the lower cheapest tracked output price at $0.60/1M tokens.
- OpenAI GPT OSS Safeguard 120B uniquely exposes Structured outputs in local model data.
- Local decision data tags OpenAI GPT OSS Safeguard 120B for Classification and JSON / Tool use.
- Mistral Magistral Small 2509 has broader tracked provider coverage for fallback and procurement flexibility.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
OpenAI GPT OSS Safeguard 120B
$270
Cheapest tracked route/tier: AWS Bedrock
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
- Provider overlap exists on AWS Bedrock; start route-level A/B tests there.
- 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 Structured outputs before moving production traffic.
- Provider overlap exists on AWS Bedrock; start route-level A/B tests there.
- OpenAI GPT OSS Safeguard 120B is $0.90/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- OpenAI GPT OSS Safeguard 120B adds Structured outputs in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-09-01 | 2025-09-01 |
| Context window | — | — |
| Parameters | 120B | 24B |
| Architecture | - | - |
| License | Proprietary | Proprietary |
| Knowledge cutoff | 2024-06 | - |
Pricing and availability
| Pricing attribute | OpenAI GPT OSS Safeguard 120B | 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 | OpenAI GPT OSS Safeguard 120B | Mistral Magistral Small 2509 |
|---|---|---|
| Vision | No | No |
| Multimodal | No | No |
| Reasoning | No | No |
| Function calling | No | No |
| Tool use | No | No |
| Structured outputs | Yes | No |
| Code execution | No | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on structured outputs: OpenAI GPT OSS Safeguard 120B. 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, OpenAI GPT OSS Safeguard 120B 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 OpenAI GPT OSS Safeguard 120B lower by about $0.51 per million blended tokens. Availability is 1 providers versus 2, so concentration risk also matters.
Choose OpenAI GPT OSS Safeguard 120B when provider fit and lower input-token cost are central to the workload. Choose Mistral Magistral Small 2509 when provider fit and broader provider choice 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, OpenAI GPT OSS Safeguard 120B or Mistral Magistral Small 2509?
OpenAI GPT OSS Safeguard 120B is cheaper on tracked token pricing. OpenAI GPT OSS Safeguard 120B 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 OpenAI GPT OSS Safeguard 120B or Mistral Magistral Small 2509 open source?
OpenAI GPT OSS Safeguard 120B 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 structured outputs, OpenAI GPT OSS Safeguard 120B or Mistral Magistral Small 2509?
OpenAI GPT OSS Safeguard 120B 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.
Where can I run OpenAI GPT OSS Safeguard 120B and Mistral Magistral Small 2509?
OpenAI GPT OSS Safeguard 120B is available on AWS Bedrock. 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.
When should I pick OpenAI GPT OSS Safeguard 120B over Mistral Magistral Small 2509?
OpenAI GPT OSS Safeguard 120B is ~233% cheaper at $0.15/1M; pay for Mistral Magistral Small 2509 only for provider fit. If your workload also depends on provider fit, start with OpenAI GPT OSS Safeguard 120B; if it depends on provider fit, run the same evaluation with Mistral Magistral Small 2509.
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Last reviewed: 2026-05-22. Data sourced from public model cards and provider documentation.