Gemini Robotics-ER 1.6 Preview vs Phi-4 Mini Reasoning
Gemini Robotics-ER 1.6 Preview (2026) and Phi-4 Mini Reasoning (2026) are frontier-tier reasoning models from Google DeepMind and Microsoft Research. Gemini Robotics-ER 1.6 Preview ships a 128k-token context window, while Phi-4 Mini Reasoning ships a 128k-token context window. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
Phi-4 Mini Reasoning is safer overall; choose Gemini Robotics-ER 1.6 Preview when vision-heavy evaluation matters.
Decision scorecard
Local evidence first| Signal | Gemini Robotics-ER 1.6 Preview | Phi-4 Mini Reasoning |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | reasoning-heavy apps |
| Decision fit | RAG, Agents, and Long context | Long context |
| Context window | 128k | 128k |
| Cheapest output | - | - |
| Provider routes | 0 tracked | 0 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Gemini Robotics-ER 1.6 Preview uniquely exposes Vision, Multimodal, and Function calling in local model data.
- Local decision data tags Gemini Robotics-ER 1.6 Preview for RAG, Agents, and Long context.
- Local decision data tags Phi-4 Mini Reasoning for Long context.
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
Unavailable
No complete token price in local provider data
Phi-4 Mini Reasoning
Unavailable
No complete token price in local provider data
Cost delta unavailable until both models have sourced input and output token prices.
Switch friction
- No overlapping tracked provider route is sourced for Gemini Robotics-ER 1.6 Preview and Phi-4 Mini Reasoning; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Vision, Multimodal, and Function calling before moving production traffic.
- No overlapping tracked provider route is sourced for Phi-4 Mini Reasoning and Gemini Robotics-ER 1.6 Preview; plan for SDK, billing, or endpoint changes.
- Gemini Robotics-ER 1.6 Preview adds Vision, Multimodal, and Function calling in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-04-14 | 2026-05-16 |
| Context window | 128k | 128k |
| Parameters | — | 3.8B |
| Architecture | decoder only | - |
| License | Proprietary | Proprietary |
| Knowledge cutoff | - | 2025-02 |
Pricing and availability
| Pricing attribute | Gemini Robotics-ER 1.6 Preview | Phi-4 Mini Reasoning |
|---|---|---|
| Input price | - | - |
| Output price | - | - |
| Providers | - | - |
Pricing not yet sourced for either model.
Capabilities
| Capability | Gemini Robotics-ER 1.6 Preview | Phi-4 Mini Reasoning |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | No |
| Reasoning | Yes | Yes |
| 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 rows are currently sourced 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, 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 reasoning mode, 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.
Pricing coverage is uneven: Gemini Robotics-ER 1.6 Preview has no token price sourced yet and Phi-4 Mini Reasoning has no token price sourced yet. Provider availability is 0 tracked routes versus 0. Treat unknown pricing as an integration gap, then verify the route you will actually call before estimating production spend.
Choose Gemini Robotics-ER 1.6 Preview when vision-heavy evaluation are central to the workload. Choose Phi-4 Mini Reasoning 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 has a larger context window, Gemini Robotics-ER 1.6 Preview or Phi-4 Mini Reasoning?
Gemini Robotics-ER 1.6 Preview supports 128k tokens, while Phi-4 Mini Reasoning supports 128k tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Is Gemini Robotics-ER 1.6 Preview or Phi-4 Mini Reasoning open source?
Gemini Robotics-ER 1.6 Preview is listed under Proprietary. Phi-4 Mini Reasoning 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, Gemini Robotics-ER 1.6 Preview or Phi-4 Mini Reasoning?
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 Phi-4 Mini Reasoning?
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 Phi-4 Mini Reasoning?
Both Gemini Robotics-ER 1.6 Preview and Phi-4 Mini Reasoning expose reasoning mode. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
When should I pick Gemini Robotics-ER 1.6 Preview over Phi-4 Mini Reasoning?
Phi-4 Mini Reasoning is safer overall; choose Gemini Robotics-ER 1.6 Preview when vision-heavy evaluation matters. If your workload also depends on vision-heavy evaluation, start with Gemini Robotics-ER 1.6 Preview; if it depends on provider fit, run the same evaluation with Phi-4 Mini Reasoning.
Continue comparing
Last reviewed: 2026-05-22. Data sourced from public model cards and provider documentation.