Fugu vs Nano Banana 2 (Gemini 3.1 Flash Image)
Fugu (2026) and Nano Banana 2 (Gemini 3.1 Flash Image) (2026) are frontier-tier reasoning models from Sakana AI and Google DeepMind. Fugu ships a 1m-token context window, while Nano Banana 2 (Gemini 3.1 Flash Image) ships a 131k-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.
Fugu fits 8x more tokens; pick it for long-context work and Nano Banana 2 (Gemini 3.1 Flash Image) for tighter calls.
Decision scorecard
Local evidence first| Signal | Fugu | Nano Banana 2 (Gemini 3.1 Flash Image) |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | reasoning-heavy apps and multimodal apps |
| Decision fit | Coding, RAG, and Agents | Long context and Vision |
| Context window | 1m | 131k |
| Cheapest output | - | $60/1M tokens |
| Provider routes | 1 tracked | 1 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- Fugu has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Fugu uniquely exposes Function calling, Tool use, and Structured outputs in local model data.
- Local decision data tags Fugu for Coding, RAG, and Agents.
- Local decision data tags Nano Banana 2 (Gemini 3.1 Flash Image) for Long context and Vision.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Fugu
Unavailable
No complete token price in local provider data
Nano Banana 2 (Gemini 3.1 Flash Image)
$15,400
Cheapest tracked route/tier: Google AI Studio
Cost delta unavailable until both models have sourced input and output token prices.
Switch friction
- No overlapping tracked provider route is sourced for Fugu and Nano Banana 2 (Gemini 3.1 Flash Image); plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Function calling, Tool use, and Structured outputs before moving production traffic.
- No overlapping tracked provider route is sourced for Nano Banana 2 (Gemini 3.1 Flash Image) and Fugu; plan for SDK, billing, or endpoint changes.
- Fugu adds Function calling, Tool use, and Structured outputs in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-06-22 | 2026-05-28 |
| Context window | 1m | 131k |
| Parameters | — | — |
| Architecture | Composition of Experts | Decoder Only |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Commercial use | Commercial use: conditional | Commercial use: conditional |
| Knowledge cutoff | - | 2025-01 |
Pricing and availability
| Pricing attribute | Fugu | Nano Banana 2 (Gemini 3.1 Flash Image) |
|---|---|---|
| Input price | - | $0.50/1M tokens |
| Output price | - | $60/1M tokens |
| Providers |
Capabilities
| Capability | Fugu | Nano Banana 2 (Gemini 3.1 Flash Image) |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | Yes |
| Function calling | Yes | No |
| Tool use | Yes | No |
| Structured outputs | Yes | No |
| 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 function calling: Fugu, tool use: Fugu, and structured outputs: Fugu. Both models share vision, multimodal input, and 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: Fugu has no token price sourced yet and Nano Banana 2 (Gemini 3.1 Flash Image) has $0.50/1M input tokens. Provider availability is 1 tracked routes versus 1. Treat unknown pricing as an integration gap, then verify the route you will actually call before estimating production spend.
Choose Fugu when long-context analysis and larger context windows are central to the workload. Choose Nano Banana 2 (Gemini 3.1 Flash Image) 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
Which has a larger context window, Fugu or Nano Banana 2 (Gemini 3.1 Flash Image)?
Fugu supports 1m tokens, while Nano Banana 2 (Gemini 3.1 Flash Image) supports 131k tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Is Fugu or Nano Banana 2 (Gemini 3.1 Flash Image) open source?
Fugu is listed under Proprietary. Nano Banana 2 (Gemini 3.1 Flash Image) 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, Fugu or Nano Banana 2 (Gemini 3.1 Flash Image)?
Both Fugu and Nano Banana 2 (Gemini 3.1 Flash Image) 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, Fugu or Nano Banana 2 (Gemini 3.1 Flash Image)?
Both Fugu and Nano Banana 2 (Gemini 3.1 Flash Image) 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, Fugu or Nano Banana 2 (Gemini 3.1 Flash Image)?
Both Fugu and Nano Banana 2 (Gemini 3.1 Flash Image) 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 Fugu and Nano Banana 2 (Gemini 3.1 Flash Image)?
Fugu is available on Sakana AI. Nano Banana 2 (Gemini 3.1 Flash Image) is available on Google AI Studio. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-06-22. Data sourced from public model cards and provider documentation.