Nano Banana 2 (Gemini 3.1 Flash Image) vs Phi-4 Reasoning Vision 15B
Nano Banana 2 (Gemini 3.1 Flash Image) (2026) and Phi-4 Reasoning Vision 15B (2026) are frontier 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 Reasoning Vision 15B ships a not-yet-sourced 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 Reasoning Vision 15B when vision-heavy evaluation matters.
Decision scorecard
Local evidence first| Signal | Nano Banana 2 (Gemini 3.1 Flash Image) | Phi-4 Reasoning Vision 15B |
|---|---|---|
| Best for | reasoning-heavy apps and multimodal apps | multimodal apps |
| Decision fit | Long context and Vision | Vision |
| Context window | 131k | — |
| 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 Reasoning 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 Reasoning Vision 15B for Vision.
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 Reasoning Vision 15B
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 Reasoning Vision 15B; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Reasoning before moving production traffic.
- No overlapping tracked provider route is sourced for Phi-4 Reasoning Vision 15B 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 Reasoning in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-05-28 | 2026-03-12 |
| Context window | 131k | — |
| Parameters | — | 15B |
| Architecture | decoder only | - |
| License | Proprietary | MIT |
| Knowledge cutoff | 2025-01 | 2025-03 |
Pricing and availability
| Pricing attribute | Nano Banana 2 (Gemini 3.1 Flash Image) | Phi-4 Reasoning Vision 15B |
|---|---|---|
| Input price | $0.50/1M tokens | - |
| Output price | $60/1M tokens | - |
| Providers | - |
Capabilities
| Capability | Nano Banana 2 (Gemini 3.1 Flash Image) | Phi-4 Reasoning Vision 15B |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | No |
| 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 reasoning mode: Nano Banana 2 (Gemini 3.1 Flash Image). Both models share vision and multimodal input, 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 Reasoning Vision 15B 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 reasoning depth and broader provider choice are central to the workload. Choose Phi-4 Reasoning Vision 15B when vision-heavy evaluation 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
Is Nano Banana 2 (Gemini 3.1 Flash Image) or Phi-4 Reasoning Vision 15B open source?
Nano Banana 2 (Gemini 3.1 Flash Image) is listed under Proprietary. Phi-4 Reasoning Vision 15B 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 Reasoning Vision 15B?
Both Nano Banana 2 (Gemini 3.1 Flash Image) and Phi-4 Reasoning Vision 15B expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for multimodal input, Nano Banana 2 (Gemini 3.1 Flash Image) or Phi-4 Reasoning Vision 15B?
Both Nano Banana 2 (Gemini 3.1 Flash Image) and Phi-4 Reasoning Vision 15B expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for reasoning mode, Nano Banana 2 (Gemini 3.1 Flash Image) or Phi-4 Reasoning Vision 15B?
Nano Banana 2 (Gemini 3.1 Flash Image) has the clearer documented reasoning mode signal in this comparison. If reasoning mode is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run Nano Banana 2 (Gemini 3.1 Flash Image) and Phi-4 Reasoning Vision 15B?
Nano Banana 2 (Gemini 3.1 Flash Image) is available on Google AI Studio. Phi-4 Reasoning Vision 15B is available on the tracked providers still being sourced. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
When should I pick Nano Banana 2 (Gemini 3.1 Flash Image) over Phi-4 Reasoning Vision 15B?
Nano Banana 2 (Gemini 3.1 Flash Image) is safer overall; choose Phi-4 Reasoning Vision 15B when vision-heavy evaluation matters. If your workload also depends on reasoning depth, start with Nano Banana 2 (Gemini 3.1 Flash Image); if it depends on vision-heavy evaluation, run the same evaluation with Phi-4 Reasoning Vision 15B.
Continue comparing
Last reviewed: 2026-06-04. Data sourced from public model cards and provider documentation.