Claude Fable 5.5 (Leaked Checkpoint) vs Gemini 3.8 Flash-Lite TTS
A direct, empirical evaluation of Claude Fable 5.5 (Leaked Checkpoint) (Anthropic) against Gemini 3.8 Flash-Lite TTS (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 3.8 Flash-Lite TTS
Developed by Google DeepMind · Proprietary Lightweight Acoustic Stream Transformer parameters
High-throughput bulk multilingual video dubbing, automated notification dispatch, real-time voice agents, customer support telephony, and accessibility readers.
| Metric | Claude Fable 5.5 (Leaked Checkpoint) | Gemini 3.8 Flash-Lite TTS |
|---|---|---|
| SWE-bench Verified | 84.2% | 58.4% |
| MMLU-Pro | 94.6% | 82.1% |
| MATH-500 | 98.4% | 85.2% |
| Context Window | 1,500,000 tokens | 64,000 characters input script |
| Input Pricing (per 1M) | $3.50 | $0.08 |
| Output Pricing (per 1M) | $17.50 | $6.00 |