POPA ReconFrontier AI Model Comparison: Grok 4.7 vs GPT-5.6 vs Fable 5.1
Frontier AI Model Comparison: Grok 4.7 vs GPT-5.6 vs Fable 5.1 xAI's Grok 4.7 lands at $2 input / $6 output per million tokens – half of GPT-5.6 and a fifth of Anthropic's Fable 5.1 Max. The question is what you give up for the discount, and the answer is: less than the price gap suggests. Fable 5.1 still takes the most rows – CursorBench (51.8%), Terminal-Bench (57.9%), AA-Briefcase (1678) and HealthBench (62.1%) – and its 20-point lead on multi-hour terminal work is the biggest gap on the board. But Grok wins outright on electrical engineering (64.0% vs 56.4%) and legal work (19.6% vs 6.…
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