Claude Fable 5.5 (Leaked Checkpoint) vs Gemini 4 Argon
A direct, empirical evaluation of Claude Fable 5.5 (Leaked Checkpoint) (Anthropic) against Gemini 4 Argon (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 Argon
Developed by Google DeepMind · Frontier Coding & Security Engine on TPU v6e Ironclad parameters
Automated GitHub issue resolution (78.4% SWE-bench Verified), cybersecurity exploit auditing (91.4% CyberSecBench), 2M token context buffer, and aggressive $1.20/$4.80 API pricing.
| Metric | Claude Fable 5.5 (Leaked Checkpoint) | Gemini 4 Argon |
|---|---|---|
| SWE-bench Verified | 84.2% | 78.4% |
| MMLU-Pro | 94.6% | 93.6% |
| MATH-500 | 98.4% | 97.6% |
| Context Window | 1,500,000 tokens | 2,000,000 tokens |
| Input Pricing (per 1M) | $3.50 | $1.20 |
| Output Pricing (per 1M) | $17.50 | $4.80 |