Grok Build 0.1 vs Phi-4 Mini Reasoning
Grok Build 0.1 (2026) and Phi-4 Mini Reasoning (2026) compare a coding-specialized model against a standalone API model. Grok Build 0.1 ships a 256K-token context window, while Phi-4 Mini Reasoning ships a 128K-token context window. This page treats the result as workflow and deployment fit, not a universal model winner.
Treat this as a product-type comparison: Grok Build 0.1 is coding-specialized model, while Phi-4 Mini Reasoning is standalone API model. Choose based on workflow fit before reading any benchmark or price row as decisive.
Decision scorecard
Local evidence first| Signal | Grok Build 0.1 | Phi-4 Mini Reasoning |
|---|---|---|
| Product type | Coding-specialized model | Standalone API model |
| Best for | custom coding agents, code generation, and tool loops | reasoning-heavy apps |
| Decision fit | Coding, RAG, and Agents | Long context |
| Context window | 256K | 128K |
| Cheapest output | $2/1M tokens | - |
| Provider routes | 3 tracked | 0 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Grok Build 0.1 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Grok Build 0.1 has broader tracked provider coverage for fallback and procurement flexibility.
- Grok Build 0.1 uniquely exposes Function calling, Tool use, and Structured outputs in local model data.
- Local decision data tags Grok Build 0.1 for Coding, RAG, and Agents.
- 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 Build 0.1
$1,300
Cheapest tracked route/tier: xAI Console
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 Build 0.1 and Phi-4 Mini Reasoning; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Function calling, Tool use, and Structured outputs before moving production traffic.
- No overlapping tracked provider route is sourced for Phi-4 Mini Reasoning and Grok Build 0.1; plan for SDK, billing, or endpoint changes.
- Grok Build 0.1 adds Function calling, Tool use, and Structured outputs in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-05-14 | 2026-05-16 |
| Context window | 256K | 128K |
| Parameters | — | 3.8B |
| Architecture | - | - |
| License | Proprietary | Proprietary |
| Knowledge cutoff | - | 2025-02 |
Pricing and availability
| Pricing attribute | Grok Build 0.1 | Phi-4 Mini Reasoning |
|---|---|---|
| Input price |
| - |
| Output price |
| - |
| Providers | - |
Capabilities
| Capability | Grok Build 0.1 | Phi-4 Mini Reasoning |
|---|---|---|
| Vision | No | No |
| Multimodal | No | 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 function calling: Grok Build 0.1, tool use: Grok Build 0.1, and structured outputs: Grok Build 0.1. 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 Build 0.1 has $1/1M input tokens and Phi-4 Mini Reasoning has no token price sourced yet. Provider availability is 3 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 Build 0.1 when coding workflow support, larger context windows, and broader provider choice 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, Grok Build 0.1 or Phi-4 Mini Reasoning?
Grok Build 0.1 supports 256K 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 Build 0.1 or Phi-4 Mini Reasoning open source?
Grok Build 0.1 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 reasoning mode, Grok Build 0.1 or Phi-4 Mini Reasoning?
Both Grok Build 0.1 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 Build 0.1 or Phi-4 Mini Reasoning?
Grok Build 0.1 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.
Which is better for tool use, Grok Build 0.1 or Phi-4 Mini Reasoning?
Grok Build 0.1 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 Grok Build 0.1 and Phi-4 Mini Reasoning?
Grok Build 0.1 is available on xAI Console, Vercel AI Gateway, and OpenRouter. Phi-4 Mini Reasoning 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: 2026-05-25. Data sourced from public model cards and provider documentation.