Gemini Robotics-ER 1.5 Preview vs Phi-4 Reasoning Vision 15B
Gemini Robotics-ER 1.5 Preview (2025) and Phi-4 Reasoning Vision 15B (2026) are compact production models from Google DeepMind and Microsoft Research. Gemini Robotics-ER 1.5 Preview ships a 32k-token context window, while Phi-4 Reasoning Vision 15B ships a not-yet-sourced 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 Reasoning Vision 15B is safer overall; choose Gemini Robotics-ER 1.5 Preview when vision-heavy evaluation matters.
Decision scorecard
Local evidence first| Signal | Gemini Robotics-ER 1.5 Preview | Phi-4 Reasoning Vision 15B |
|---|---|---|
| Best for | multimodal apps and tool-calling agents | multimodal apps |
| Decision fit | Agents, Vision, and JSON / Tool use | Vision |
| Context window | 32k | — |
| Cheapest output | - | - |
| Provider routes | 1 tracked | 0 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Gemini Robotics-ER 1.5 Preview has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Gemini Robotics-ER 1.5 Preview has broader tracked provider coverage for fallback and procurement flexibility.
- Gemini Robotics-ER 1.5 Preview uniquely exposes Vision, Function calling, and Tool use in local model data.
- Local decision data tags Gemini Robotics-ER 1.5 Preview for Agents, Vision, and JSON / Tool use.
- Local decision data tags Phi-4 Reasoning Vision 15B for Vision.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Gemini Robotics-ER 1.5 Preview
Unavailable
No complete token price in local provider data
Phi-4 Reasoning Vision 15B
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 1.5 Preview and Phi-4 Reasoning Vision 15B; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Vision, Function calling, and Tool use before moving production traffic.
- No overlapping tracked provider route is sourced for Phi-4 Reasoning Vision 15B and Gemini Robotics-ER 1.5 Preview; plan for SDK, billing, or endpoint changes.
- Gemini Robotics-ER 1.5 Preview adds Vision, Function calling, and Tool use in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-03-12 | 2026-03-12 |
| Context window | 32k | — |
| Parameters | — | 15B |
| Architecture | decoder only | - |
| License | Proprietary | Microsoft Research |
| Knowledge cutoff | - | 2025-03 |
Pricing and availability
| Pricing attribute | Gemini Robotics-ER 1.5 Preview | Phi-4 Reasoning Vision 15B |
|---|---|---|
| Input price | - | - |
| Output price | - | - |
| Providers | - |
Pricing not yet sourced for either model.
Capabilities
| Capability | Gemini Robotics-ER 1.5 Preview | Phi-4 Reasoning Vision 15B |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | Yes |
| Reasoning | No | No |
| Function calling | Yes | No |
| Tool use | Yes | No |
| Structured outputs | No | 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 1.5 Preview, function calling: Gemini Robotics-ER 1.5 Preview, and tool use: Gemini Robotics-ER 1.5 Preview. Both models share multimodal input, 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 1.5 Preview has no token price sourced yet and Phi-4 Reasoning Vision 15B has no token price sourced yet. Provider availability is 1 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 1.5 Preview when vision-heavy evaluation and broader provider choice are central to the workload. Choose Phi-4 Reasoning Vision 15B 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
Is Gemini Robotics-ER 1.5 Preview or Phi-4 Reasoning Vision 15B open source?
Gemini Robotics-ER 1.5 Preview is listed under Proprietary. Phi-4 Reasoning Vision 15B is listed under Microsoft Research. 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 1.5 Preview or Phi-4 Reasoning Vision 15B?
Gemini Robotics-ER 1.5 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 1.5 Preview or Phi-4 Reasoning Vision 15B?
Both Gemini Robotics-ER 1.5 Preview and Phi-4 Reasoning Vision 15B expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for function calling, Gemini Robotics-ER 1.5 Preview or Phi-4 Reasoning Vision 15B?
Gemini Robotics-ER 1.5 Preview has the clearer documented function calling signal in this comparison. If function calling is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for tool use, Gemini Robotics-ER 1.5 Preview or Phi-4 Reasoning Vision 15B?
Gemini Robotics-ER 1.5 Preview has the clearer documented tool use signal in this comparison. If tool use 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 1.5 Preview and Phi-4 Reasoning Vision 15B?
Gemini Robotics-ER 1.5 Preview is available on Google AI Studio. Phi-4 Reasoning Vision 15B is available on the tracked providers still being sourced. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
Continue comparing
Last reviewed: 2026-05-19. Data sourced from public model cards and provider documentation.