Nano Banana 2 (Gemini 3.1 Flash Image) vs Phi-4 Mini Reasoning
Nano Banana 2 (Gemini 3.1 Flash Image) (2026) and Phi-4 Mini Reasoning (2026) are frontier-tier reasoning models from Google DeepMind and Microsoft Research. Nano Banana 2 (Gemini 3.1 Flash Image) ships a 131k-token context window, while Phi-4 Mini Reasoning ships a 128k-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.
Nano Banana 2 (Gemini 3.1 Flash Image) is safer overall; choose Phi-4 Mini Reasoning when provider fit matters.
Decision scorecard
Local evidence first| Signal | Nano Banana 2 (Gemini 3.1 Flash Image) | Phi-4 Mini Reasoning |
|---|---|---|
| Best for | reasoning-heavy apps and multimodal apps | reasoning-heavy apps |
| Decision fit | Long context and Vision | Long context |
| Context window | 131k | 128k |
| Cheapest output | $60/1M tokens | - |
| Provider routes | 1 tracked | 0 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Nano Banana 2 (Gemini 3.1 Flash Image) has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Nano Banana 2 (Gemini 3.1 Flash Image) has broader tracked provider coverage for fallback and procurement flexibility.
- Nano Banana 2 (Gemini 3.1 Flash Image) uniquely exposes Vision and Multimodal in local model data.
- Local decision data tags Nano Banana 2 (Gemini 3.1 Flash Image) for Long context and Vision.
- 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.
Nano Banana 2 (Gemini 3.1 Flash Image)
$15,400
Cheapest tracked route/tier: Google AI Studio
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 Nano Banana 2 (Gemini 3.1 Flash Image) and Phi-4 Mini Reasoning; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Vision and Multimodal before moving production traffic.
- No overlapping tracked provider route is sourced for Phi-4 Mini Reasoning and Nano Banana 2 (Gemini 3.1 Flash Image); plan for SDK, billing, or endpoint changes.
- Nano Banana 2 (Gemini 3.1 Flash Image) adds Vision and Multimodal in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-05-28 | 2026-05-16 |
| Context window | 131k | 128k |
| Parameters | — | 3.8B |
| Architecture | decoder only | - |
| License | Proprietary | MIT |
| Knowledge cutoff | 2025-01 | 2025-02 |
Pricing and availability
| Pricing attribute | Nano Banana 2 (Gemini 3.1 Flash Image) | Phi-4 Mini Reasoning |
|---|---|---|
| Input price | $0.50/1M tokens | - |
| Output price | $60/1M tokens | - |
| Providers | - |
Capabilities
| Capability | Nano Banana 2 (Gemini 3.1 Flash Image) | Phi-4 Mini Reasoning |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | No |
| Reasoning | Yes | Yes |
| Function calling | No | No |
| Tool use | No | 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 vision: Nano Banana 2 (Gemini 3.1 Flash Image) and multimodal input: Nano Banana 2 (Gemini 3.1 Flash Image). 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: Nano Banana 2 (Gemini 3.1 Flash Image) has $0.50/1M input tokens and Phi-4 Mini Reasoning has no token price sourced yet. Provider availability is 1 tracked routes versus 0. Treat unknown pricing as an integration gap, then verify the route you will actually call before estimating production spend.
Choose Nano Banana 2 (Gemini 3.1 Flash Image) when long-context analysis, 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, Nano Banana 2 (Gemini 3.1 Flash Image) or Phi-4 Mini Reasoning?
Nano Banana 2 (Gemini 3.1 Flash Image) 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 Nano Banana 2 (Gemini 3.1 Flash Image) or Phi-4 Mini Reasoning open source?
Nano Banana 2 (Gemini 3.1 Flash Image) is listed under Proprietary. Phi-4 Mini Reasoning is listed under MIT. 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 vision, Nano Banana 2 (Gemini 3.1 Flash Image) or Phi-4 Mini Reasoning?
Nano Banana 2 (Gemini 3.1 Flash Image) has the clearer documented vision signal in this comparison. If vision is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for multimodal input, Nano Banana 2 (Gemini 3.1 Flash Image) or Phi-4 Mini Reasoning?
Nano Banana 2 (Gemini 3.1 Flash Image) 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, Nano Banana 2 (Gemini 3.1 Flash Image) or Phi-4 Mini Reasoning?
Both Nano Banana 2 (Gemini 3.1 Flash Image) 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.
Where can I run Nano Banana 2 (Gemini 3.1 Flash Image) and Phi-4 Mini Reasoning?
Nano Banana 2 (Gemini 3.1 Flash Image) is available on Google AI Studio. 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: 2026-05-31. Data sourced from public model cards and provider documentation.