Claude Fable 5.1 vs Claude Opus 5.5
Compare Claude Fable 5.1 vs Claude Opus 5.5 API pricing, token costs, context windows, and latency. See which model is cheaper and better for your stack.
Claude Fable 5.1 charges $10.00/1M input and $50.00/1M output tokens, compared to Claude Opus 5.5 at $4.00/1M input and $20.00/1M output. Claude Opus 5.5 is 2.5x cheaper on input tokens. In reasoning benchmarks, Claude Opus 5.5 holds the higher AA Intelligence Index rating (59/100). For latency-critical streaming, Claude Fable 5.1 delivers 88 t/s (155.0s TTFT) while Claude Opus 5.5 provides 112 t/s (351.0s TTFT).
Full Metric & Specification Comparison
| Metric | Claude Fable 5.1 | Claude Opus 5.5 | Advantage |
|---|---|---|---|
| Provider | Anthropic | Anthropic | - |
| Input Token Cost (1M) | $10.000 | $4.000 | Claude Opus 5.5 |
| Output Token Cost (1M) | $50.000 | $20.000 | Claude Opus 5.5 |
| Context Window | 1,000k tokens | 1,000k tokens | Tie |
| AA Intelligence Index | 49/100 | 59/100 | Claude Opus 5.5 |
| Streaming Latency | Moderate | Fast | - |
Key Architectural Takeaways
- Input Token Cost: Claude Fable 5.1 is $10.00/1M vs Claude Opus 5.5 at $4.00/1M
- Output Token Cost: Claude Fable 5.1 is $50.00/1M vs Claude Opus 5.5 at $20.00/1M
- Context Window: Claude Fable 5.1 supports 1,000k tokens vs Claude Opus 5.5 with 1,000k tokens
- Benchmark Intelligence Rating: Claude Fable 5.1 scores 49/100 vs Claude Opus 5.5 at 59/100 (AA Index v5)
- Inference Latency: Claude Fable 5.1 is rated Moderate vs Claude Opus 5.5 rated Fast
Calculate Your Team's Exact Bill Difference
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Deploying Claude Opus 5.5 over Claude Fable 5.1 saves $315.00/mo ($3780/yr) at this volume.
Frequently Asked Questions
Is Claude Fable 5.1 cheaper than Claude Opus 5.5?
Claude Opus 5.5 is significantly more economical, charging $4.00/1M input compared to $10.00/1M for Claude Fable 5.1.
Which model should I choose for production?
If your primary constraint is API cost and high query throughput, choose Claude Opus 5.5. If you require peak reasoning accuracy and complex tool use, Claude Opus 5.5 is recommended.
How does context window compare between Claude Fable 5.1 and Claude Opus 5.5?
Claude Fable 5.1 offers the larger context window (1,000k tokens), allowing you to pass significantly larger codebases or documents without chunking.
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