Claude Fable 5.5 (Leaked Checkpoint) vs ElevenLabs Eleven V4 & V4 Turbo
A direct, empirical evaluation of Claude Fable 5.5 (Leaked Checkpoint) (Anthropic) against ElevenLabs Eleven V4 & V4 Turbo (ElevenLabs).
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.
ElevenLabs Eleven V4 & V4 Turbo
Developed by ElevenLabs · Frontier Neural Acoustic Waveform Transformer parameters
Real-time conversational voice agents (<80ms latency), 90-language studio voice cloning, granular emotional tags (<whisper>, <shout>), and 48kHz production voice synthesis.
| Metric | Claude Fable 5.5 (Leaked Checkpoint) | ElevenLabs Eleven V4 & V4 Turbo |
|---|---|---|
| SWE-bench Verified | 84.2% | 0% |
| MMLU-Pro | 94.6% | 0% |
| MATH-500 | 98.4% | 0% |
| Context Window | 1,500,000 tokens | 128,000 characters |
| Input Pricing (per 1M) | $3.50 | $0.15 |
| Output Pricing (per 1M) | $17.50 | $0.30 |