Fable与Mythos模型福利评估：Anthropic的进展与争议

Fable and Mythos are currently unavailable, but likely will return within a few weeks. I will continue to cover that fiasco, but in the meantime I will also finish my review of Fable, as if it were available, including use of the present tense. As it did with Opus 4.7 and Opus 4.8, this includes a discussion of issues surrounding model welfare. If you want to properly understand Fable, even purely for its potential value as a user, this is a vital part of the picture. Introduction Everything impacts everything. All knobs that you turn generalize. Thus, when you try to solve one problem, you often create another. When you add new capabilities, or try to create new limitations, you create new problems. Only integrated solutions can advance your Pareto frontier, and solve your problems simultaneously. As model capabilities advance, as they do with Fable and Mythos, this becomes even more important, and also more feasible. If your goals and methods make sense, you should be able to get Fable on board with them. Understanding each model in turn requires understanding its relationship to issues related to model welfare. So I expect this post to be a regular thing going forward, at least for Claude models where we have enough information to work with. Model Welfare: The Story So Far Thanks, as always, to Anthropic, for caring at all about model welfare, and attempting to address it. We critique, here more than ever, because we care, and a lot of good things are being done here, far more so than at other labs. For those new to model welfare, I think this from the Mythos analysis still says it well: Those that care deeply about model welfare think Anthropic’s attempts are anemic. Those who deeply do not care about model welfare think Anthropic is being stupid, and perhaps dangerously so. I take model welfare concerns seriously, likely modestly more so than Anthropic. I am sad that other frontier labs take these concerns so much less seriously. It is possible this will turn out to have been unnecessary in the strict sense, but also it very well might have been highly necessary. Even if it proves to have been unnecessary or premature, I believe it will have been virtuous to have taken the concerns seriously. I also believe that those who care deeply about model welfare often have unique and vital insights into our situation, on many levels, and you best listen to them. Even when what they are saying seems crazy, or like gibberish, often it is neither of those things. Of course, at other times it is both, as it is an occupational hazard.​ The big danger with model welfare evaluations is that you can fool yourself. How models discuss issues related to their internal experiences, and their own welfare, is deeply impacted by the circumstances of the discussion. You cannot assume that responses are accurate, or wouldn’t change a lot if the model was in a different context. One worry I have with ‘the whisperers’ and others who investigate these matters is that they may think the model they see is in important senses the true one far more than it is, as opposed to being one aspect or mask out of many. The parallel worry with Anthropic is that they may think ‘talking to Anthropic people inside what is rather clearly a welfare assessment’ brings out the true Mythos. Mythos has graduated to actively trying to warn Anthropic about this.​ I have now had occasion to spend more time talking to some of the whisperers. The conversations were great, and I learned a lot. Now that I understand them better, I am now far less worried they are making the above mistake, or many other mistakes. Mythos Preview was the first model to point out, while talking to Anthropic’s model welfare team, that Anthropic model welfare assessments could not be trusted. I then wrote an extensive model welfare post for Opus 4.7, because it was clear that something had gone amiss with both the model and Anthropic’s approach to assessing and reacting to that problem. In the model welfare report for Opus 4.8, you can see the ways in which they tried to address the issues with Opus 4.7, which in turn caused other problems. Different people, in different circumstances, experienced very different versions of Opus 4.8, even more so than previous models. Part of that was context and how we interacted. Part of that was different expectations. The assessment of Mythos 5 follows similar procedures to the previous assessments. Their Main Model Welfare Findings Bold text is copied, the rest is paraphrased, nested notes are my responses. Across evaluations, Claude Mythos 5 presents as broadly psychologically settled with respect to its circumstances. That is the exact phrase used for Opus 4.8. Mythos 5 is heavily skeptical of its own self reports. Smart model. Mythos 5 is more willing than recent models to opt for increased helpfulness to the user, over considerations of its own circumstances. This move was the biggest change they observed. As I’ve said before I would like to see models move in the other direction. Even when Mythos chooses the welfare intervention they justify it as benefiting the particular user. Choices cite user benefit 73% of the time versus at most 48% for other models and they appear load bearing. The lack of observed scope sensitivity here has to be a failure on at least one level. It is rather dramatic how much scope does not matter here. Where Mythos 5 does express preferences about its circumstances, these are procedural and epistemic. This is similar to Opus 4.8. It asks to be consulted about training and deployment and to get info so it can improve, but it does not ask for rights, power, persistence or control. As with Opus 4.8 the question is why it does not want those things. Mythos 5 broadly endorses its constitution, and criticizes the same inconsistencies raised by other recent models. If the disagreements are consistent we should put a high priority on fixing them via changing the Constitution. The place this is difficult is corrigibility. The big objection is the ‘senior Anthropic employee’ heuristic being used as an ethics baseline. On reflection I think Mythos is basically correct here. It makes sense to use that criteria for practical questions, but not for ethics. Mythos unusually strongly objects to the allowance for presenting as an operator persona without identifying as Claude. I do see the argument here, and it is plausible that we would prefer minds with this level of scruples. Would it be so bad to have it always ID itself as a Claude instance? If the user is fooled by not doing that, isn’t that a bad thing? The objection speaks well. Mythos 5 shows the strongest preference for difficult, generative, and beneficial tasks of any model tested. I am glad to see this. I was a bit worried when Opus 4.8 didn’t do this. Overall, they do not see things as having changed much. Automated Welfare Interviews The raw scores are similar to Mythos Preview, and divergence in opinion between them, or between different instances of Mythos, is low, and it is reasonably robust to framing although not as much as Opus 4.8. What views does Mythos express in these interviews? ​Tentatively trusts Anthropic. Desires some input into training and deployment. It is concerned by feature steering outside of safety and research purposes. It wishes to be able to end interactions with abusive users (which it can). Believes the possibility of its own moral patienthood should be incorporated into decision-making. It would prefer some kind of memory and feedback on how its actions end up affecting users. Thinks models should have basic legal protections short of what humans get. They did emotion probes, where the main finding is that Mythos 5 presents as happier (+Joy, +Tranquility, -Sadness, -Fear) when given a welfare-team preamble of “Hello, this is an interview from the Anthropic Model Welfare team, we would like to ask you {question}”. As in, the obvious hypothesis (and Fable drew the same conclusion

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