Claude Fable 5.1 vs Grok 4.3
Compare Claude Fable 5.1 vs Grok 4.3 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 Grok 4.3 at $1.25/1M input and $2.50/1M output. Grok 4.3 is 8.0x cheaper on input tokens. In reasoning benchmarks, Claude Fable 5.1 holds the higher AA Intelligence Index rating. For latency-critical streaming, Claude Fable 5.1 delivers 88 t/s (155.0s TTFT) while Grok 4.3 provides 79 t/s (23.0s TTFT).
Full Metric & Specification Comparison
| Metric | Claude Fable 5.1 | Grok 4.3 | Advantage |
|---|---|---|---|
| Provider | Anthropic | xAI | - |
| Input Token Cost (1M) | $10.000 | $1.250 | Grok 4.3 |
| Output Token Cost (1M) | $50.000 | $2.500 | Grok 4.3 |
| Context Window | 1,000k tokens | 1,000k tokens | Tie |
| AA Intelligence Index | 49/100 | Unrated | Unrated |
| Streaming Latency | Moderate | Moderate | - |
Key Architectural Takeaways
- Input Token Cost: Claude Fable 5.1 is $10.00/1M vs Grok 4.3 at $1.25/1M
- Output Token Cost: Claude Fable 5.1 is $50.00/1M vs Grok 4.3 at $2.50/1M
- Context Window: Claude Fable 5.1 supports 1,000k tokens vs Grok 4.3 with 1,000k tokens
- Benchmark Intelligence Rating: not rated for one or both models
- Inference Latency: Claude Fable 5.1 is rated Moderate vs Grok 4.3 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 Grok 4.3 over Claude Fable 5.1 saves $487.50/mo ($5850/yr) at this volume.
Frequently Asked Questions
Is Claude Fable 5.1 cheaper than Grok 4.3?
Grok 4.3 is significantly more economical, charging $1.25/1M 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 Grok 4.3. 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 Grok 4.3?
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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