Grok 4.1 vs Phi-4 Reasoning Vision 15B
Grok 4.1 (2025) and Phi-4 Reasoning Vision 15B (2026) are general-purpose language models from xAI and Microsoft Research. Grok 4.1 ships a 2M-token context window, while Phi-4 Reasoning Vision 15B ships a not-yet-sourced context window. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit. It focuses on practical selection signals rather than broad model-family marketing. The goal is to make the tradeoff clear before deeper testing.
Phi-4 Reasoning Vision 15B is safer overall; choose Grok 4.1 when provider fit matters.
Specs
| Released | 2025-11-17 | 2026-03-12 |
| Context window | 2M | — |
| Parameters | — | 15B |
| Architecture | - | - |
| License | Proprietary | Microsoft Research |
| Knowledge cutoff | - | - |
Pricing and availability
| Grok 4.1 | Phi-4 Reasoning Vision 15B | |
|---|---|---|
| Input price | - | - |
| Output price | - | - |
| Providers | - | - |
Pricing not yet sourced for either model.
Capabilities
| Grok 4.1 | Phi-4 Reasoning Vision 15B | |
|---|---|---|
| Vision | ||
| Multimodal | ||
| Reasoning | ||
| Function calling | ||
| Tool use | ||
| Structured outputs | ||
| Code execution |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint is close: both models cover multimodal input. 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.
Pricing coverage is uneven: Grok 4.1 has no token price sourced yet and Phi-4 Reasoning Vision 15B 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 Grok 4.1 when provider fit 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. For teams standardizing a stack, that distinction is often the difference between a benchmark win and a reliable deployment.
FAQ
Is Grok 4.1 or Phi-4 Reasoning Vision 15B open source?
Grok 4.1 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 multimodal input, Grok 4.1 or Phi-4 Reasoning Vision 15B?
Both Grok 4.1 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.
When should I pick Grok 4.1 over Phi-4 Reasoning Vision 15B?
Phi-4 Reasoning Vision 15B is safer overall; choose Grok 4.1 when provider fit matters. If your workload also depends on provider fit, start with Grok 4.1; if it depends on provider fit, run the same evaluation with Phi-4 Reasoning Vision 15B.
What is the main difference between Grok 4.1 and Phi-4 Reasoning Vision 15B?
Grok 4.1 and Phi-4 Reasoning Vision 15B differ most on context, provider coverage, capabilities, or pricing depending on the data currently sourced. Use the specs table first, then validate the model behavior with your own prompts.
Continue comparing
Last reviewed: 2026-04-19. Data sourced from public model cards and provider documentation.