Grok 4.6 and DeepSeek V4 Pro: near-Fable power, far lower price
A heavy Agent user shares a first-hand model-selection update after DeepSeek V4 Pro and Grok 4.6 launched within hours of each other. Key data: DeepSeek V4 Pro costs $0.87 per million output tokens, roughly 1/57 the price of Claude Fable 5, scores 87.9 on Terminal Bench 2.1 versus Fable 5's 88.0, and lifts DeepSWE from 12.8 to 62.7. Grok 4.6, priced at $2/$6 per million tokens, finished most development tasks in under 20 minutes; four hours of heavy use consumed only 2% of the author's weekly SuperGrok Heavy quota. The post also admits the impossible triangle is not fully broken: DeepSeek still lacks multimodal support and is not fast, while Grok lags Fable 5 on complex engineering and agent work. Useful for engineers comparing model cost, speed, and agent capability.