Claude Fable 5.1 vs Nvidia Nemotron 3 Ultra 550B A55b
API pricing, context window and capabilities for Claude Fable 5.1 and Nvidia Nemotron 3 Ultra 550B A55b, side by side. Prices are the cheapest listed serving route per 1M tokens, from LiteLLM and OpenRouter.
Verdict
computed from the published numbersClaude Fable 5.1 wins on Terminal-Bench, on intelligence and on context window. Nvidia Nemotron 3 Ultra 550B A55b wins on price.
Price
Nvidia Nemotron 3 Ultra 550B A55b
Terminal-Bench
Claude Fable 5.1
Intelligence
Claude Fable 5.1
Context window
Claude Fable 5.1
Key takeaways
who wins on what, from the published numbersClaude Fable 5.1 wins
- Larger context window (1M vs 262K)
- More serving providers (7 vs 3)
- Has web search
Nvidia Nemotron 3 Ultra 550B A55b wins
- Cheaper input ($10.00 vs $0.50 /1M)
- Cheaper output ($50.00 vs $2.15 /1M)
- Higher max output (128K vs 203K)
Cheaper overall
Nvidia Nemotron 3 Ultra 550B A55b
$0.50 + $2.15 /1M
Larger context
Claude Fable 5.1
1M
More providers
Claude Fable 5.1
7 providers
Pricing & specs
cheapest listed route · per 1M tokensOn-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower.
| Claude Fable 5.1 | Nvidia Nemotron 3 Ultra 550B A55b | |
|---|---|---|
| Input $/1M | $10.00via Anthropic | $0.50via DeepInfra best |
| Output $/1M | $50.00via Anthropic | $2.15via Wandb best |
| Context window | 1M best | 262K |
| Max output | 128K | 203K best |
| Serving providers | 7 best | 3 |
| Date | Released Sep 1, 2026 | Released Jun 4, 2026 |
Benchmarks
Benchmark scores, side by side| Claude Fable 5.1 | Nvidia Nemotron 3 Ultra 550B A55b | |
|---|---|---|
| Intelligence | 53.4 best | 22.9 |
| Terminal-Bench | 91% best | 54% |
| GPQA Diamond | 94% best | 87% |
| Output speed | 71 t/s | 166 t/s best |
| Latency (TTFT) | 249.68s | 1.12s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Claude Fable 5.1
via Amazon Bedrock
$100
Nvidia Nemotron 3 Ultra 550B A55b
via DeepInfra
$4.70
Capabilities
feature support, side by side| Feature | Claude Fable 5.1 | Nvidia Nemotron 3 Ultra 550B A55b |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | — | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | ✓ | — |
Related comparisons
Frequently asked questions
Which is cheaper, Claude Fable 5.1 or Nvidia Nemotron 3 Ultra 550B A55b?
Nvidia Nemotron 3 Ultra 550B A55b is cheaper for input ($10.00 vs $0.50 per 1M tokens) from DeepInfra. Nvidia Nemotron 3 Ultra 550B A55b is cheaper for output ($50.00 vs $2.15 per 1M tokens) from Wandb.
What is the context window difference between Claude Fable 5.1 and Nvidia Nemotron 3 Ultra 550B A55b?
Claude Fable 5.1 has a 1M-token context window and Nvidia Nemotron 3 Ultra 550B A55b has 262K tokens, so Claude Fable 5.1 can take a larger prompt.
How do Claude Fable 5.1 and Nvidia Nemotron 3 Ultra 550B A55b compare on benchmarks?
On the tracked benchmarks, Claude Fable 5.1 leads on Terminal-Bench, and Claude Fable 5.1 leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
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