Claude Fable 5 vs Nemotron 3 Super-120B-A12B
Claude Fable 5 (2026) and Nemotron 3 Super-120B-A12B (2026) are frontier reasoning models from Anthropic and NVIDIA AI. Claude Fable 5 ships a 1m-token context window, while Nemotron 3 Super-120B-A12B ships a 1.05m-token context window. On SWE-bench Verified, Claude Fable 5 leads by 35.5 pts. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
Nemotron 3 Super-120B-A12B is ~11011% cheaper at $0.09/1M; pay for Claude Fable 5 only for reasoning depth.
Decision scorecard
Local evidence first| Signal | Claude Fable 5 | Nemotron 3 Super-120B-A12B |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | long-context analysis and provider-routed production |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 1m | 1.05m |
| Cheapest output | $50/1M tokens | $0.45/1M tokens |
| Provider routes | 5 tracked | 6 tracked |
| Shared benchmarks | SWE-bench Verified leader | 1 shared |
Decision tradeoffs
- Claude Fable 5 holds a shared-benchmark lead on SWE-bench Verified, ahead by 35.5 points.
- Claude Fable 5 uniquely exposes Vision, Multimodal, and Reasoning in local model data.
- Local decision data tags Claude Fable 5 for Coding, RAG, and Agents.
- Nemotron 3 Super-120B-A12B has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Nemotron 3 Super-120B-A12B has the lower cheapest tracked output price at $0.45/1M tokens.
- Nemotron 3 Super-120B-A12B has broader tracked provider coverage for fallback and procurement flexibility.
- Local decision data tags Nemotron 3 Super-120B-A12B for Coding, RAG, and Agents.
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
Nemotron 3 Super-120B-A12B
$185
Cheapest tracked route/tier: OpenRouter
Estimated monthly gap: $20,316. 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.
- Nemotron 3 Super-120B-A12B is $49.55/1M 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.
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Claude Fable 5 is $49.55/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Claude Fable 5 adds Vision, Multimodal, and Reasoning in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-06-09 | 2026-03-11 |
| Context window | 1m | 1.05m |
| Parameters | — | 120B |
| Architecture | Decoder Only | Decoder Only |
| License | Proprietary | NVIDIA Open Model |
| Openness | Proprietary | Open weights |
| Commercial use | Commercial use: conditional | Commercial use: permitted |
| Knowledge cutoff | - | - |
Pricing and availability
| Pricing attribute | Claude Fable 5 | Nemotron 3 Super-120B-A12B |
|---|---|---|
| Input price | $10/1M tokens | $0.09/1M tokens |
| Output price | $50/1M tokens | $0.45/1M tokens |
| Providers |
Capabilities
| Capability | Claude Fable 5 | Nemotron 3 Super-120B-A12B |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | No |
| Reasoning | Yes | No |
| Function calling | Yes | No |
| Tool use | Yes | No |
| Structured outputs | Yes | Yes |
| Code execution | No | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | Claude Fable 5 | Nemotron 3 Super-120B-A12B |
|---|---|---|
| SWE-bench Verified | 96.0 | 60.5 |
Deep dive
On shared benchmark coverage, SWE-bench Verified has Claude Fable 5 at 96 and Nemotron 3 Super-120B-A12B at 60.5, with Claude Fable 5 ahead by 35.5 points. The largest visible gap is 35.5 points on SWE-bench Verified, which matters most when that benchmark mirrors your workload. Treat isolated benchmark wins as directional, because provider routing, prompt style, and tool access can move real application results.
The capability footprint differs most on vision: Claude Fable 5, multimodal input: Claude Fable 5, reasoning mode: Claude Fable 5, function calling: Claude Fable 5, and tool use: Claude Fable 5. Both models share structured outputs, 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 Nemotron 3 Super-120B-A12B lists $0.09/1M input and $0.45/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Nemotron 3 Super-120B-A12B lower by about $21.80 per million blended tokens. Availability is 5 providers versus 6, so concentration risk also matters.
Choose Claude Fable 5 when reasoning depth are central to the workload. Choose Nemotron 3 Super-120B-A12B 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.
FAQ
Which has a larger context window, Claude Fable 5 or Nemotron 3 Super-120B-A12B?
Nemotron 3 Super-120B-A12B supports 1.05m tokens, while Claude Fable 5 supports 1m 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 Nemotron 3 Super-120B-A12B?
Nemotron 3 Super-120B-A12B is cheaper on tracked token pricing. Claude Fable 5 costs $10/1M input and $50/1M output tokens. Nemotron 3 Super-120B-A12B costs $0.09/1M input and $0.45/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Claude Fable 5 or Nemotron 3 Super-120B-A12B open source?
Claude Fable 5 is listed under Proprietary. Nemotron 3 Super-120B-A12B is listed under NVIDIA Open Model. 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 Nemotron 3 Super-120B-A12B?
Claude Fable 5 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, Claude Fable 5 or Nemotron 3 Super-120B-A12B?
Claude Fable 5 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 Claude Fable 5 and Nemotron 3 Super-120B-A12B?
Claude Fable 5 is available on Anthropic, AWS Bedrock, GCP Vertex AI, Microsoft Foundry, and OpenRouter. Nemotron 3 Super-120B-A12B is available on Cloudflare Workers AI, DeepInfra, NVIDIA NIM, OpenRouter, and Fireworks AI. 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.