Grok 4.1 vs Phi-4 Mini Reasoning
Grok 4.1 (2025) and Phi-4 Mini Reasoning (2026) are frontier-tier reasoning models from xAI and Microsoft Research. Grok 4.1 ships a 131K-token context window, while Phi-4 Mini Reasoning ships a 128K-token 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 Mini Reasoning is safer overall; choose Grok 4.1 when long-context analysis matters.
Decision scorecard
Local evidence first| Signal | Grok 4.1 | 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 | 131K | 128K |
| Cheapest output | - | - |
| Provider routes | 0 tracked | 0 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Grok 4.1 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Grok 4.1 uniquely exposes Multimodal, Function calling, and Tool use in local model data.
- Local decision data tags Grok 4.1 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.
Grok 4.1
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 Grok 4.1 and Phi-4 Mini Reasoning; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Multimodal, Function calling, and Tool use before moving production traffic.
- No overlapping tracked provider route is sourced for Phi-4 Mini Reasoning and Grok 4.1; plan for SDK, billing, or endpoint changes.
- Grok 4.1 adds Multimodal, Function calling, and Tool use in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-11-17 | 2026-05-16 |
| Context window | 131K | 128K |
| Parameters | — | 3.8B |
| Architecture | - | - |
| License | Proprietary | Proprietary |
| Knowledge cutoff | 2024-11 | 2025-02 |
Pricing and availability
| Pricing attribute | Grok 4.1 | Phi-4 Mini Reasoning |
|---|---|---|
| Input price | - | - |
| Output price | - | - |
| Providers | - | - |
Pricing not yet sourced for either model.
Capabilities
| Capability | Grok 4.1 | Phi-4 Mini Reasoning |
|---|---|---|
| Vision | No | No |
| Multimodal | Yes | No |
| Reasoning | Yes | Yes |
| 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 multimodal input: Grok 4.1, function calling: Grok 4.1, and tool use: Grok 4.1. 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: Grok 4.1 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 Grok 4.1 when long-context analysis and larger context windows 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. For teams standardizing a stack, that distinction is often the difference between a benchmark win and a reliable deployment.
FAQ
Which has a larger context window, Grok 4.1 or Phi-4 Mini Reasoning?
Grok 4.1 supports 131K 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 Grok 4.1 or Phi-4 Mini Reasoning open source?
Grok 4.1 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 multimodal input, Grok 4.1 or Phi-4 Mini Reasoning?
Grok 4.1 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, Grok 4.1 or Phi-4 Mini Reasoning?
Both Grok 4.1 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.
Which is better for function calling, Grok 4.1 or Phi-4 Mini Reasoning?
Grok 4.1 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.
When should I pick Grok 4.1 over Phi-4 Mini Reasoning?
Phi-4 Mini Reasoning is safer overall; choose Grok 4.1 when long-context analysis matters. If your workload also depends on long-context analysis, start with Grok 4.1; 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.