Claude Fable 5.5 (Leaked Checkpoint) vs Gemini 4 Carbon
A direct, empirical evaluation of Claude Fable 5.5 (Leaked Checkpoint) (Anthropic) against Gemini 4 Carbon (Google DeepMind).
Claude Fable 5.5 (Leaked Checkpoint)
Developed by Anthropic · Proprietary Frontier Dynamic Reasoner parameters
Terminal-Bench 4.0 autonomous shell execution (78.5% target), recursive self-critique, and 1.5M-token repository refactoring.
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 5.5 (Leaked Checkpoint) | Gemini 4 Carbon |
|---|---|---|
| SWE-bench Verified | 84.2% | 69.2% |
| MMLU-Pro | 94.6% | 84.6% |
| MATH-500 | 98.4% | 91.4% |
| Context Window | 1,500,000 tokens | 1,000,000 tokens |
| Input Pricing (per 1M) | $3.50 | $0.80 |
| Output Pricing (per 1M) | $17.50 | $2.40 |