Claude Fable 5.1 vs Gemini 4 Carbon
A direct, empirical evaluation of Claude Fable 5.1 (Anthropic) against Gemini 4 Carbon (Google DeepMind).
Claude Fable 5.1
Developed by Anthropic · Proprietary Frontier parameters
Full-repository software refactoring, agentic tool workflows, formal verification, and 1.5M-token needle retrieval.
Gemini 4 Carbon
Developed by Google DeepMind · Carbon-Aware Frontier Transformer on TPU v6e parameters
Sub-watt green computing, 62% energy reduction per million tokens, carbon-aware datagrid routing, and eco-tier batch execution discounts.
| Metric | Claude Fable 5.1 | Gemini 4 Carbon |
|---|---|---|
| SWE-bench Verified | 82.8% | 69.2% |
| MMLU-Pro | 92.4% | 84.6% |
| MATH-500 | 97.9% | 91.4% |
| Context Window | 1,500,000 tokens | 1,000,000 tokens |
| Input Pricing (per 1M) | $12.00 | $0.80 |
| Output Pricing (per 1M) | $60.00 | $2.40 |