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speculative take: a large part of why anthropic delayed the model release is to prevent frontier open labs like kimi, qwen, deepseek but also startups from competing. i hope this does not affect open post-training as that would be a sad state of affairs!
When Fable 5 is used for frontier LLM development, it does not notify the user and instead limits the model’s capabilities through methods such as prompt modification, steering vectors, and PEFT. Anthropic estimated that this would affect approximately 0.03% of traffic.