Claude Fable 5 vs Nano Banana 2 (Gemini 3.1 Flash Image)
Claude Fable 5 (2026) and Nano Banana 2 (Gemini 3.1 Flash Image) (2026) are frontier-tier reasoning models from Anthropic and Google DeepMind. Claude Fable 5 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.
Nano Banana 2 (Gemini 3.1 Flash Image) is ~1900% cheaper at $0.50/1M; pay for Claude Fable 5 only for long-context analysis.
Decision scorecard
Local evidence first| Signal | Claude Fable 5 | 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 | $50/1M tokens | $60/1M tokens |
| Provider routes | 4 tracked | 1 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- Claude Fable 5 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Claude Fable 5 has the lower cheapest tracked output price at $50/1M tokens.
- Claude Fable 5 has broader tracked provider coverage for fallback and procurement flexibility.
- Claude Fable 5 uniquely exposes Function calling, Tool use, and Structured outputs in local model data.
- Local decision data tags Claude Fable 5 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.
Claude Fable 5
$20,500
Cheapest tracked route/tier: Anthropic
Nano Banana 2 (Gemini 3.1 Flash Image)
$15,400
Cheapest tracked route/tier: Google AI Studio
Estimated monthly gap: $5,100. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- No overlapping tracked provider route is sourced for Claude Fable 5 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 $10/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- 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 Claude Fable 5; plan for SDK, billing, or endpoint changes.
- Claude Fable 5 is $10/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Claude Fable 5 adds Function calling, Tool use, and Structured outputs in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-06-09 | 2026-05-28 |
| Context window | 1m | 131k |
| Parameters | — | — |
| Architecture | Decoder Only | 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 | Claude Fable 5 | Nano Banana 2 (Gemini 3.1 Flash Image) |
|---|---|---|
| Input price | $10/1M tokens | $0.50/1M tokens |
| Output price | $50/1M tokens | $60/1M tokens |
| Providers |
Capabilities
| Capability | Claude Fable 5 | 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: Claude Fable 5, tool use: Claude Fable 5, and structured outputs: Claude Fable 5. 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.
For cost, Claude Fable 5 lists $10/1M input and $50/1M output tokens on the cheapest tracked provider, while Nano Banana 2 (Gemini 3.1 Flash Image) lists $0.50/1M input and $60/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Nano Banana 2 (Gemini 3.1 Flash Image) lower by about $3.65 per million blended tokens. Availability is 4 providers versus 1, so concentration risk also matters.
Choose Claude Fable 5 when long-context analysis, larger context windows, and broader provider choice are central to the workload. Choose Nano Banana 2 (Gemini 3.1 Flash Image) when vision-heavy evaluation 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.
FAQ
Which has a larger context window, Claude Fable 5 or Nano Banana 2 (Gemini 3.1 Flash Image)?
Claude Fable 5 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.
Which is cheaper, Claude Fable 5 or Nano Banana 2 (Gemini 3.1 Flash Image)?
Nano Banana 2 (Gemini 3.1 Flash Image) is cheaper on tracked token pricing. Claude Fable 5 costs $10/1M input and $50/1M output tokens. Nano Banana 2 (Gemini 3.1 Flash Image) costs $0.50/1M input and $60/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Claude Fable 5 or Nano Banana 2 (Gemini 3.1 Flash Image) open source?
Claude Fable 5 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, Claude Fable 5 or Nano Banana 2 (Gemini 3.1 Flash Image)?
Both Claude Fable 5 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, Claude Fable 5 or Nano Banana 2 (Gemini 3.1 Flash Image)?
Both Claude Fable 5 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.
Where can I run Claude Fable 5 and Nano Banana 2 (Gemini 3.1 Flash Image)?
Claude Fable 5 is available on Anthropic, AWS Bedrock, GCP Vertex AI, and Microsoft Foundry. 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: 2026-06-15. Data sourced from public model cards and provider documentation.