Claude Fable 5.5 (Leaked Checkpoint) vs MiniMax M3.1-Flash-Preview
A direct, empirical evaluation of Claude Fable 5.5 (Leaked Checkpoint) (Anthropic) against MiniMax M3.1-Flash-Preview (MiniMax).
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.
MiniMax M3.1-Flash-Preview
Developed by MiniMax · Proprietary Sparse Coding MoE parameters
Low-latency interactive IDE code completions at 165 tokens/sec, SWE-bench Verified bug fixes (73.8%), terminal automation, and budget-optimized pull request reviews.
| Metric | Claude Fable 5.5 (Leaked Checkpoint) | MiniMax M3.1-Flash-Preview |
|---|---|---|
| SWE-bench Verified | 84.2% | 73.8% |
| MMLU-Pro | 94.6% | 81.2% |
| MATH-500 | 98.4% | 92.4% |
| Context Window | 1,500,000 tokens | 1,000,000 tokens |
| Input Pricing (per 1M) | $3.50 | $0.10 |
| Output Pricing (per 1M) | $17.50 | $0.40 |