DeepSeek R1 0528 vs Phi-4 Mini Reasoning
DeepSeek R1 0528 (2025) and Phi-4 Mini Reasoning (2026) are frontier-tier reasoning models from DeepSeek and Microsoft Research. DeepSeek R1 0528 ships a 130K-token context window, while Phi-4 Mini Reasoning ships a 128K-token context window. On AIME 2024, DeepSeek R1 0528 leads by 33.9 pts. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit. It focuses on practical selection signals rather than broad model-family marketing.
Phi-4 Mini Reasoning is safer overall; choose DeepSeek R1 0528 when coding workflow support matters.
Decision scorecard
Local evidence first| Signal | DeepSeek R1 0528 | Phi-4 Mini Reasoning |
|---|---|---|
| Best for | reasoning-heavy apps and provider-routed production | reasoning-heavy apps |
| Decision fit | Coding, RAG, and Agents | Long context |
| Context window | 130K | 128K |
| Cheapest output | $2.15/1M tokens | - |
| Provider routes | 6 tracked | 0 tracked |
| Shared benchmarks | AIME 2024 leader | 2 rows |
Decision tradeoffs
- DeepSeek R1 0528 leads the largest shared benchmark signal on AIME 2024 by 33.9 points.
- DeepSeek R1 0528 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- DeepSeek R1 0528 has broader tracked provider coverage for fallback and procurement flexibility.
- DeepSeek R1 0528 uniquely exposes Structured outputs and Code execution in local model data.
- Local decision data tags DeepSeek R1 0528 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.
DeepSeek R1 0528
$938
Cheapest tracked route/tier: OpenRouter
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 DeepSeek R1 0528 and Phi-4 Mini Reasoning; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Structured outputs and Code execution before moving production traffic.
- No overlapping tracked provider route is sourced for Phi-4 Mini Reasoning and DeepSeek R1 0528; plan for SDK, billing, or endpoint changes.
- DeepSeek R1 0528 adds Structured outputs and Code execution in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-05-28 | 2026-05-16 |
| Context window | 130K | 128K |
| Parameters | 685B total, 37B active (MoE) | 3.8B |
| Architecture | decoder only | - |
| License | Open Source | Proprietary |
| Knowledge cutoff | - | 2025-02 |
Pricing and availability
| Pricing attribute | DeepSeek R1 0528 | Phi-4 Mini Reasoning |
|---|---|---|
| Input price | $0.50/1M tokens | - |
| Output price | $2.15/1M tokens | - |
| Providers | - |
Capabilities
| Capability | DeepSeek R1 0528 | Phi-4 Mini Reasoning |
|---|---|---|
| Vision | No | No |
| Multimodal | No | No |
| Reasoning | Yes | Yes |
| Function calling | No | No |
| Tool use | No | No |
| Structured outputs | Yes | No |
| Code execution | Yes | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | DeepSeek R1 0528 | Phi-4 Mini Reasoning |
|---|---|---|
| AIME 2024 | 91.4 | 57.5 |
| Google-Proof Q&A | 81.0 | 52.0 |
Deep dive
On shared benchmark coverage, AIME 2024 has DeepSeek R1 0528 at 91.4 and Phi-4 Mini Reasoning at 57.5, with DeepSeek R1 0528 ahead by 33.9 points; Google-Proof Q&A has DeepSeek R1 0528 at 81 and Phi-4 Mini Reasoning at 52, with DeepSeek R1 0528 ahead by 29 points. The largest visible gap is 33.9 points on AIME 2024, which matters most when that benchmark mirrors your workload. Treat isolated benchmark wins as directional, because provider routing, prompt style, and tool access can move real application results.
The capability footprint differs most on structured outputs: DeepSeek R1 0528 and code execution: DeepSeek R1 0528. 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: DeepSeek R1 0528 has $0.50/1M input tokens and Phi-4 Mini Reasoning has no token price sourced yet. Provider availability is 6 tracked routes versus 0. Treat unknown pricing as an integration gap, then verify the route you will actually call before estimating production spend.
Choose DeepSeek R1 0528 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.
FAQ
Which has a larger context window, DeepSeek R1 0528 or Phi-4 Mini Reasoning?
DeepSeek R1 0528 supports 130K 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 DeepSeek R1 0528 or Phi-4 Mini Reasoning open source?
DeepSeek R1 0528 is listed under Open Source. 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, DeepSeek R1 0528 or Phi-4 Mini Reasoning?
Both DeepSeek R1 0528 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 structured outputs, DeepSeek R1 0528 or Phi-4 Mini Reasoning?
DeepSeek R1 0528 has the clearer documented structured outputs signal in this comparison. If structured outputs is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for code execution, DeepSeek R1 0528 or Phi-4 Mini Reasoning?
DeepSeek R1 0528 has the clearer documented code execution signal in this comparison. If code execution is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run DeepSeek R1 0528 and Phi-4 Mini Reasoning?
DeepSeek R1 0528 is available on Together AI, Fireworks AI, GCP Vertex AI, Novita AI, 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: 2026-05-22. Data sourced from public model cards and provider documentation.