Phi-4 Mini Flash Reasoning vs Qwen3.5-9B
Phi-4 Mini Flash Reasoning (2025) and Qwen3.5-9B (2026) are frontier reasoning models from Microsoft Research and Alibaba. Phi-4 Mini Flash Reasoning ships a 128k-token context window, while Qwen3.5-9B ships a 262k-token context window. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads. It focuses on practical selection signals rather than broad model-family marketing.
Qwen3.5-9B is safer overall; choose Phi-4 Mini Flash Reasoning when reasoning depth matters.
Decision scorecard
Local evidence first| Signal | Phi-4 Mini Flash Reasoning | Qwen3.5-9B |
|---|---|---|
| Best for | reasoning-heavy apps | multimodal apps, tool-calling agents, and provider-routed production |
| Decision fit | Long context | Coding, RAG, and Agents |
| Context window | 128k | 262k |
| Cheapest output | - | $0.15/1M tokens |
| Provider routes | 1 tracked | 3 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- Phi-4 Mini Flash Reasoning uniquely exposes Reasoning in local model data.
- Local decision data tags Phi-4 Mini Flash Reasoning for Long context.
- Qwen3.5-9B has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Qwen3.5-9B has broader tracked provider coverage for fallback and route flexibility.
- Qwen3.5-9B uniquely exposes Vision, Multimodal, and JSON / Tool use in local model data.
- Local decision data tags Qwen3.5-9B for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Phi-4 Mini Flash Reasoning
Unavailable
No complete token price in local provider data
Qwen3.5-9B
$118
Cheapest tracked route/tier: Together AI
Cost delta unavailable until both models have sourced input and output token prices.
Switch friction
- No overlapping tracked provider route is sourced for Phi-4 Mini Flash Reasoning and Qwen3.5-9B; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Reasoning before moving production traffic.
- Qwen3.5-9B adds Vision, Multimodal, and JSON / JSON / Tool use in local capability data.
- No overlapping tracked provider route is sourced for Qwen3.5-9B and Phi-4 Mini Flash Reasoning; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Vision, Multimodal, and JSON / JSON / Tool use before moving production traffic.
- Phi-4 Mini Flash Reasoning adds Reasoning in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-12-01 | 2026-03-02 |
| Context window | 128k | 262k |
| Parameters | 3.8B | 9B |
| Architecture | Decoder Only | Decoder Only |
| License | MITOSI-approved | Apache 2.0OSI-approved |
| Openness | Open source | Open source |
| Weights | Unknown | Unknown |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: permitted | Commercial use: permitted |
| Knowledge cutoff | 2025-02 | - |
Pricing and availability
| Pricing attribute | Phi-4 Mini Flash Reasoning | Qwen3.5-9B |
|---|---|---|
| Input price | - | $0.10/1M tokens |
| Output price | - | $0.15/1M tokens |
| Providers |
Capabilities
| Capability | Phi-4 Mini Flash Reasoning | Qwen3.5-9B |
|---|---|---|
| Vision | No | Yes |
| Multimodal | No | Yes |
| Reasoning | Yes | No |
| JSON / Tool use | No | Yes |
| Structured outputs | No | Yes |
| Code execution | No | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark scores are currently available for this pair.
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Last reviewed: 2026-06-15. Data sourced from public model cards and provider documentation.