Gemini Robotics-ER 1.6 Preview vs Mistral Magistral Small 2509
Gemini Robotics-ER 1.6 Preview (2026) and Mistral Magistral Small 2509 (2025) are frontier reasoning models from Google DeepMind and MistralAI. Gemini Robotics-ER 1.6 Preview ships a 128k-token context window, while Mistral Magistral Small 2509 ships a not-yet-sourced context window. On pricing, Mistral Magistral Small 2509 costs $0.50/1M input tokens versus $1/1M 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.
Mistral Magistral Small 2509 is ~100% cheaper at $0.50/1M; pay for Gemini Robotics-ER 1.6 Preview only for reasoning depth.
Decision scorecard
Local evidence first| Signal | Gemini Robotics-ER 1.6 Preview | Mistral Magistral Small 2509 |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | provider-routed production |
| Decision fit | RAG, Agents, and Long context | General |
| Context window | 128k | — |
| Cheapest output | $5/1M tokens | $1.50/1M tokens |
| Provider routes | 1 tracked | 2 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- Gemini Robotics-ER 1.6 Preview has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Gemini Robotics-ER 1.6 Preview uniquely exposes Vision, Multimodal, and Reasoning in local model data.
- Local decision data tags Gemini Robotics-ER 1.6 Preview for RAG, Agents, and Long context.
- Mistral Magistral Small 2509 has the lower cheapest tracked output price at $1.50/1M tokens.
- 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.
Gemini Robotics-ER 1.6 Preview
$2,050
Cheapest tracked route/tier: Google AI Studio
Mistral Magistral Small 2509
$775
Cheapest tracked route/tier: AWS Bedrock
Estimated monthly gap: $1,275. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- No overlapping tracked provider route is sourced for Gemini Robotics-ER 1.6 Preview and Mistral Magistral Small 2509; plan for SDK, billing, or endpoint changes.
- Mistral Magistral Small 2509 is $3.50/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Vision, Multimodal, and Reasoning before moving production traffic.
- No overlapping tracked provider route is sourced for Mistral Magistral Small 2509 and Gemini Robotics-ER 1.6 Preview; plan for SDK, billing, or endpoint changes.
- Gemini Robotics-ER 1.6 Preview is $3.50/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Gemini Robotics-ER 1.6 Preview adds Vision, Multimodal, and Reasoning in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-04-14 | 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 | - | - |
Pricing and availability
| Pricing attribute | Gemini Robotics-ER 1.6 Preview | Mistral Magistral Small 2509 |
|---|---|---|
| Input price | $1/1M tokens | $0.50/1M tokens |
| Output price | $5/1M tokens | $1.50/1M tokens |
| Providers |
Capabilities
| Capability | Gemini Robotics-ER 1.6 Preview | Mistral Magistral Small 2509 |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | No |
| Reasoning | Yes | No |
| Function calling | Yes | No |
| Tool use | Yes | 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 scores are currently available for this pair.
Deep dive
The capability footprint differs most on vision: Gemini Robotics-ER 1.6 Preview, multimodal input: Gemini Robotics-ER 1.6 Preview, reasoning mode: Gemini Robotics-ER 1.6 Preview, function calling: Gemini Robotics-ER 1.6 Preview, tool use: Gemini Robotics-ER 1.6 Preview, and structured outputs: Gemini Robotics-ER 1.6 Preview. 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, Gemini Robotics-ER 1.6 Preview lists $1/1M input and $5/1M 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 Mistral Magistral Small 2509 lower by about $1.40 per million blended tokens. Availability is 1 providers versus 2, so concentration risk also matters.
Choose Gemini Robotics-ER 1.6 Preview when reasoning depth are central to the workload. Choose Mistral Magistral Small 2509 when provider fit, lower input-token cost, 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.
FAQ
Which is cheaper, Gemini Robotics-ER 1.6 Preview or Mistral Magistral Small 2509?
Mistral Magistral Small 2509 is cheaper on tracked token pricing. Gemini Robotics-ER 1.6 Preview costs $1/1M input and $5/1M 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 Gemini Robotics-ER 1.6 Preview or Mistral Magistral Small 2509 open source?
Gemini Robotics-ER 1.6 Preview 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, Gemini Robotics-ER 1.6 Preview or Mistral Magistral Small 2509?
Gemini Robotics-ER 1.6 Preview 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 multimodal input, Gemini Robotics-ER 1.6 Preview or Mistral Magistral Small 2509?
Gemini Robotics-ER 1.6 Preview has the clearer documented multimodal input signal in this comparison. If multimodal input is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for reasoning mode, Gemini Robotics-ER 1.6 Preview or Mistral Magistral Small 2509?
Gemini Robotics-ER 1.6 Preview has the clearer documented reasoning mode signal in this comparison. If reasoning mode is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run Gemini Robotics-ER 1.6 Preview and Mistral Magistral Small 2509?
Gemini Robotics-ER 1.6 Preview is available on Google AI Studio. 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.