GPT-5.5 vs Claude Fable 5.1
Compare GPT-5.5 vs Claude Fable 5.1 API pricing, token costs, context windows, and latency. See which model is cheaper and better for your stack.
GPT-5.5 charges $5.00/1M input and $30.00/1M output tokens, compared to Claude Fable 5.1 at $10.00/1M input and $50.00/1M output. GPT-5.5 is 2.0x cheaper on input tokens. In reasoning benchmarks, Claude Fable 5.1 holds the higher AA Intelligence Index rating. For latency-critical streaming, GPT-5.5 delivers 79 t/s (39.0s TTFT) while Claude Fable 5.1 provides 88 t/s (155.0s TTFT).
Full Metric & Specification Comparison
| Metric | GPT-5.5 | Claude Fable 5.1 | Advantage |
|---|---|---|---|
| Provider | OpenAI | Anthropic | - |
| Input Token Cost (1M) | $5.000 | $10.000 | GPT-5.5 |
| Output Token Cost (1M) | $30.000 | $50.000 | GPT-5.5 |
| Context Window | 922k tokens | 1,000k tokens | Claude Fable 5.1 |
| AA Intelligence Index | Unrated | 49/100 | Unrated |
| Streaming Latency | Moderate | Moderate | - |
Key Architectural Takeaways
- Input Token Cost: GPT-5.5 is $5.00/1M vs Claude Fable 5.1 at $10.00/1M
- Output Token Cost: GPT-5.5 is $30.00/1M vs Claude Fable 5.1 at $50.00/1M
- Context Window: GPT-5.5 supports 922k tokens vs Claude Fable 5.1 with 1,000k tokens
- Benchmark Intelligence Rating: not rated for one or both models
- Inference Latency: GPT-5.5 is rated Moderate vs Claude Fable 5.1 rated Moderate
Calculate Your Team's Exact Bill Difference
Drag the sliders below to see real-time cost divergences based on your daily token consumption.
Deploying GPT-5.5 over Claude Fable 5.1 saves $225.00/mo ($2700/yr) at this volume.
Frequently Asked Questions
Is GPT-5.5 cheaper than Claude Fable 5.1?
GPT-5.5 is significantly more economical, charging $5.00/1M 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 GPT-5.5. If you require peak reasoning accuracy and complex tool use, Claude Fable 5.1 is recommended.
How does context window compare between GPT-5.5 and Claude Fable 5.1?
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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