Claude Fable 5.1 vs Gemini 3.8 Flash
Compare Claude Fable 5.1 vs Gemini 3.8 Flash 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 Gemini 3.8 Flash at $0.75/1M input and $3.75/1M output. Gemini 3.8 Flash is 13.3x cheaper on input tokens. In reasoning benchmarks, Claude Fable 5.1 holds the higher AA Intelligence Index rating (49/100). For latency-critical streaming, Claude Fable 5.1 delivers 88 t/s (155.0s TTFT) while Gemini 3.8 Flash provides 113 t/s (20.0s TTFT).
Full Metric & Specification Comparison
| Metric | Claude Fable 5.1 | Gemini 3.8 Flash | Advantage |
|---|---|---|---|
| Provider | Anthropic | - | |
| Input Token Cost (1M) | $10.000 | $0.750 | Gemini 3.8 Flash |
| Output Token Cost (1M) | $50.000 | $3.750 | Gemini 3.8 Flash |
| Context Window | 1,000k tokens | 1,000k tokens | Tie |
| AA Intelligence Index | 49/100 | 31/100 | Claude Fable 5.1 |
| Streaming Latency | Moderate | Fast | - |
Key Architectural Takeaways
- Input Token Cost: Claude Fable 5.1 is $10.00/1M vs Gemini 3.8 Flash at $0.75/1M
- Output Token Cost: Claude Fable 5.1 is $50.00/1M vs Gemini 3.8 Flash at $3.75/1M
- Context Window: Claude Fable 5.1 supports 1,000k tokens vs Gemini 3.8 Flash with 1,000k tokens
- Benchmark Intelligence Rating: Claude Fable 5.1 scores 49/100 vs Gemini 3.8 Flash at 31/100 (AA Index v5)
- Inference Latency: Claude Fable 5.1 is rated Moderate vs Gemini 3.8 Flash rated Fast
Calculate Your Team's Exact Bill Difference
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Deploying Gemini 3.8 Flash over Claude Fable 5.1 saves $485.63/mo ($5828/yr) at this volume.
Frequently Asked Questions
Is Claude Fable 5.1 cheaper than Gemini 3.8 Flash?
Gemini 3.8 Flash is significantly more economical, charging $0.75/1M 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 Gemini 3.8 Flash. If you require peak reasoning accuracy and complex tool use, Claude Fable 5.1 is recommended.
How does context window compare between Claude Fable 5.1 and Gemini 3.8 Flash?
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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