Nano Banana 2 (Gemini 3.1 Flash Image) vs GPT-4o-mini Search Preview
Nano Banana 2 (Gemini 3.1 Flash Image) (2026) and GPT-4o-mini Search Preview (2025) are frontier reasoning models from Google DeepMind and OpenAI. Nano Banana 2 (Gemini 3.1 Flash Image) ships a 131k-token context window, while GPT-4o-mini Search Preview ships a 128k-token context window. On pricing, GPT-4o-mini Search Preview costs $0.15/1M input tokens versus $0.50/1M for the alternative. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
GPT-4o-mini Search Preview is ~233% cheaper at $0.15/1M; pay for Nano Banana 2 (Gemini 3.1 Flash Image) only for reasoning depth.
Decision scorecard
Local evidence first| Signal | Nano Banana 2 (Gemini 3.1 Flash Image) | GPT-4o-mini Search Preview |
|---|---|---|
| Best for | reasoning-heavy apps and multimodal apps | provider-routed production |
| Decision fit | Long context and Vision | RAG, Long context, and Classification |
| Context window | 131k | 128k |
| Cheapest output | $60/1M tokens | $0.60/1M tokens |
| Provider routes | 1 tracked | 2 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) uniquely exposes Vision, Multimodal, and Reasoning in local model data.
- Local decision data tags Nano Banana 2 (Gemini 3.1 Flash Image) for Long context and Vision.
- GPT-4o-mini Search Preview has the lower cheapest tracked output price at $0.60/1M tokens.
- GPT-4o-mini Search Preview has broader tracked provider coverage for fallback and procurement flexibility.
- GPT-4o-mini Search Preview uniquely exposes Structured outputs in local model data.
- Local decision data tags GPT-4o-mini Search Preview for RAG, Long context, and Classification.
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
GPT-4o-mini Search Preview
$270
Cheapest tracked route/tier: OpenRouter
Estimated monthly gap: $15,130. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- No overlapping tracked provider route is sourced for Nano Banana 2 (Gemini 3.1 Flash Image) and GPT-4o-mini Search Preview; plan for SDK, billing, or endpoint changes.
- GPT-4o-mini Search Preview is $59.40/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Vision, Multimodal, and Reasoning before moving production traffic.
- GPT-4o-mini Search Preview adds Structured outputs in local capability data.
- No overlapping tracked provider route is sourced for GPT-4o-mini Search Preview and Nano Banana 2 (Gemini 3.1 Flash Image); plan for SDK, billing, or endpoint changes.
- Nano Banana 2 (Gemini 3.1 Flash Image) is $59.40/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Check replacement coverage for Structured outputs before moving production traffic.
- Nano Banana 2 (Gemini 3.1 Flash Image) adds Vision, Multimodal, and Reasoning in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-05-28 | 2025-02-26 |
| Context window | 131k | 128k |
| Parameters | — | — |
| Architecture | decoder only | decoder only |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Commercial use | Commercial use with conditions | Commercial use with conditions |
| Knowledge cutoff | 2025-01 | 2023-10 |
Pricing and availability
| Pricing attribute | Nano Banana 2 (Gemini 3.1 Flash Image) | GPT-4o-mini Search Preview |
|---|---|---|
| Input price | $0.50/1M tokens | $0.15/1M tokens |
| Output price | $60/1M tokens | $0.60/1M tokens |
| Providers |
Capabilities
| Capability | Nano Banana 2 (Gemini 3.1 Flash Image) | GPT-4o-mini Search Preview |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | No |
| Reasoning | Yes | No |
| Function calling | No | No |
| Tool use | No | No |
| Structured outputs | No | Yes |
| 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), multimodal input: Nano Banana 2 (Gemini 3.1 Flash Image), reasoning mode: Nano Banana 2 (Gemini 3.1 Flash Image), and structured outputs: GPT-4o-mini Search Preview. Both models share the core language-model surface, 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.
For cost, Nano Banana 2 (Gemini 3.1 Flash Image) lists $0.50/1M input and $60/1M output tokens on the cheapest tracked provider, while GPT-4o-mini Search Preview lists $0.15/1M input and $0.60/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts GPT-4o-mini Search Preview lower by about $18.07 per million blended tokens. Availability is 1 providers versus 2, so concentration risk also matters.
Choose Nano Banana 2 (Gemini 3.1 Flash Image) when reasoning depth and larger context windows are central to the workload. Choose GPT-4o-mini Search Preview when provider fit, lower input-token cost, and broader provider choice 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, Nano Banana 2 (Gemini 3.1 Flash Image) or GPT-4o-mini Search Preview?
Nano Banana 2 (Gemini 3.1 Flash Image) supports 131k tokens, while GPT-4o-mini Search Preview supports 128k tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, Nano Banana 2 (Gemini 3.1 Flash Image) or GPT-4o-mini Search Preview?
GPT-4o-mini Search Preview is cheaper on tracked token pricing. Nano Banana 2 (Gemini 3.1 Flash Image) costs $0.50/1M input and $60/1M output tokens. GPT-4o-mini Search Preview costs $0.15/1M input and $0.60/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Nano Banana 2 (Gemini 3.1 Flash Image) or GPT-4o-mini Search Preview open source?
Nano Banana 2 (Gemini 3.1 Flash Image) is listed under Proprietary. GPT-4o-mini Search Preview 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 vision, Nano Banana 2 (Gemini 3.1 Flash Image) or GPT-4o-mini Search Preview?
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 GPT-4o-mini Search Preview?
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.
Where can I run Nano Banana 2 (Gemini 3.1 Flash Image) and GPT-4o-mini Search Preview?
Nano Banana 2 (Gemini 3.1 Flash Image) is available on Google AI Studio. GPT-4o-mini Search Preview is available on OpenRouter and Vercel AI Gateway. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
Continue comparing
Last reviewed: 2026-06-05. Data sourced from public model cards and provider documentation.