Claude Fable 5.5 (Leaked Checkpoint) vs Aleph Alpha Kolibri
A direct, empirical evaluation of Claude Fable 5.5 (Leaked Checkpoint) (Anthropic) against Aleph Alpha Kolibri (Aleph Alpha).
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.
Aleph Alpha Kolibri
Developed by Aleph Alpha · 78.2 Billion Total Parameters (32 routed experts + 2 shared experts) parameters
EU AI Act and GDPR compliant enterprise deployments, European legal and technical translation, 1M context long-document analysis, and 3.46B parameter active inference efficiency.
| Metric | Claude Fable 5.5 (Leaked Checkpoint) | Aleph Alpha Kolibri |
|---|---|---|
| SWE-bench Verified | 84.2% | 62.8% |
| MMLU-Pro | 94.6% | 86.4% |
| MATH-500 | 98.4% | 92.4% |
| Context Window | 1,500,000 tokens | 1,048,576 tokens (1M) |
| Input Pricing (per 1M) | $3.50 | $0.18 |
| Output Pricing (per 1M) | $17.50 | $0.55 |