Nano Banana Pro (Gemini 3 Pro Image Preview) vs Llama Guard 4 12B
Nano Banana Pro (Gemini 3 Pro Image Preview) (2025) and Llama Guard 4 12B (2025) are compact production models from Google DeepMind and AI at Meta. Nano Banana Pro (Gemini 3 Pro Image Preview) ships a 66k-token context window, while Llama Guard 4 12B ships a 164k-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.
Llama Guard 4 12B is ~1011% cheaper at $0.18/1M; pay for Nano Banana Pro (Gemini 3 Pro Image Preview) only for provider fit.
Decision scorecard
Local evidence first| Signal | Nano Banana Pro (Gemini 3 Pro Image Preview) | Llama Guard 4 12B |
|---|---|---|
| Best for | provider-routed production | provider-routed production |
| Decision fit | General | RAG, Long context, and Classification |
| Context window | 66k | 164k |
| Cheapest output | $120/1M tokens | $0.18/1M tokens |
| Provider routes | 3 tracked | 3 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- Use Nano Banana Pro (Gemini 3 Pro Image Preview) when your own prompt tests beat the comparison signals; the local data does not show a decisive standalone advantage yet.
- Llama Guard 4 12B has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Llama Guard 4 12B has the lower cheapest tracked output price at $0.18/1M tokens.
- Llama Guard 4 12B uniquely exposes Structured outputs in local model data.
- Local decision data tags Llama Guard 4 12B 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 Pro (Gemini 3 Pro Image Preview)
$31,600
Cheapest tracked route/tier: Google AI Studio
Llama Guard 4 12B
$189
Cheapest tracked route/tier: OpenRouter
Estimated monthly gap: $31,411. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Llama Guard 4 12B is $120/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Llama Guard 4 12B adds Structured outputs in local capability data.
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Nano Banana Pro (Gemini 3 Pro Image Preview) is $120/1M 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.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-09-01 | 2025-04-05 |
| Context window | 66k | 164k |
| Parameters | — | 12B |
| Architecture | Decoder Only | Decoder Only |
| License | Proprietary | Llama 2 Community |
| Openness | Proprietary | Open weights |
| Commercial use | Commercial use: conditional | Commercial use: conditional |
| Knowledge cutoff | - | 2024-08 |
Pricing and availability
| Pricing attribute | Nano Banana Pro (Gemini 3 Pro Image Preview) | Llama Guard 4 12B |
|---|---|---|
| Input price | $2/1M tokens | $0.18/1M tokens |
| Output price | $120/1M tokens | $0.18/1M tokens |
| Providers |
Capabilities
| Capability | Nano Banana Pro (Gemini 3 Pro Image Preview) | Llama Guard 4 12B |
|---|---|---|
| Vision | No | No |
| Multimodal | No | No |
| Reasoning | No | 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 scores are currently available for this pair.
Deep dive
The capability footprint differs most on structured outputs: Llama Guard 4 12B. 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 Pro (Gemini 3 Pro Image Preview) lists $2/1M input and $120/1M output tokens on the cheapest tracked provider, while Llama Guard 4 12B lists $0.18/1M input and $0.18/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Llama Guard 4 12B lower by about $37.22 per million blended tokens. Availability is 3 providers versus 3, so concentration risk also matters.
Choose Nano Banana Pro (Gemini 3 Pro Image Preview) when provider fit are central to the workload. Choose Llama Guard 4 12B when long-context analysis, larger context windows, and lower input-token cost 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.
FAQ
Which has a larger context window, Nano Banana Pro (Gemini 3 Pro Image Preview) or Llama Guard 4 12B?
Llama Guard 4 12B supports 164k tokens, while Nano Banana Pro (Gemini 3 Pro Image Preview) supports 66k 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 Pro (Gemini 3 Pro Image Preview) or Llama Guard 4 12B?
Llama Guard 4 12B is cheaper on tracked token pricing. Nano Banana Pro (Gemini 3 Pro Image Preview) costs $2/1M input and $120/1M output tokens. Llama Guard 4 12B costs $0.18/1M input and $0.18/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Nano Banana Pro (Gemini 3 Pro Image Preview) or Llama Guard 4 12B open source?
Nano Banana Pro (Gemini 3 Pro Image Preview) is listed under Proprietary. Llama Guard 4 12B is listed under Llama 2 Community. 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 structured outputs, Nano Banana Pro (Gemini 3 Pro Image Preview) or Llama Guard 4 12B?
Llama Guard 4 12B 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.
Where can I run Nano Banana Pro (Gemini 3 Pro Image Preview) and Llama Guard 4 12B?
Nano Banana Pro (Gemini 3 Pro Image Preview) is available on Google AI Studio, GCP Vertex AI, and OpenRouter. Llama Guard 4 12B is available on NVIDIA NIM, Replicate API, and OpenRouter. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
When should I pick Nano Banana Pro (Gemini 3 Pro Image Preview) over Llama Guard 4 12B?
Llama Guard 4 12B is ~1011% cheaper at $0.18/1M; pay for Nano Banana Pro (Gemini 3 Pro Image Preview) only for provider fit. If your workload also depends on provider fit, start with Nano Banana Pro (Gemini 3 Pro Image Preview); if it depends on long-context analysis, run the same evaluation with Llama Guard 4 12B.
Continue comparing
Last reviewed: 2026-06-15. Data sourced from public model cards and provider documentation.