Ask HN: Founders, what are you building that survives a Mythos-class model?

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Have you used Mythos? So far, it's advertising hype.

As someone building AI software factories for the greater part of a year, I can share some learnings: - Smart models like Claude Opus cannot be replaced with dumber models at a reasonable expenditure with similar cost by iterating multiple times. Mythos will be the same cost or more expensive. Don't think you can throw enough funding at qwen-next-coder to rival Opus at a similar price. - Mythos (like Opus) will change the way we work, but not in the way you think. The use case for Opus is narrowing in comparison to Sonnet - a lot of what Opus used to do, Sonnet can do for cheaper, and sometimes better too. Opus is great at exploring a problem space and filling in the gaps - but any agent harness will not leave such intelligence to fate—they'll do fine-tuning or add specific instructions and possibly guardrails. Lazy (but long-term optimal) solutions will leave more reasoning to smarter models and dictate less. - A lot of what we do (and should do) is a cost optimization problem. Categorizing what we do (exploration vs. reasoning) tends to be structural (like Haiku), logical (like Sonnet instruct/non-thinking), and reasoning-driven (like Opus/thinking). Sometimes the challenge is long context-based reasoning, e.g. when planning a vision breakdown encompassing 50+ features, Sonnet could* do it given 1M context, but it struggles to reason about long context problems (Opus long-term reasoning drops off less) e.g. first 5 features are accurate, but the further you go, the less accurate it becomes (near-sighted vision). - If Mythos has like a 10m context size long reasoning window, Mythos would become the go-to model for medium-term planning (3-6 months). Opus 1m doesn't cut it for 3m-6m horizon planning, not to mention long-term (1y+ with 100++ features). The industry is in need of a x10 compression/context size improvement to tackle bigger problems. One of the challenges right now is we (as humans) can't refine and reason about features fast enough to keep pace with what AI can deliver—until AI has the ability to perform longer-term reasoning, we can't trust it to plan things longer term. There's another problem with this long-term reasoning in that we (as humans) can't (easily) reason so far ahead, but AI could if it could keep the entire context in mind.

In short, unless Mythos is cheaper than Sonnet (which is 3-5x more expensive than what is out there today, e.g., GPT Mini, Minimax 2.7, GPT-OSS 120b), it's unlikely it would become the go-to model.

I'd add that a smarter reasoning model can only be better if you provide relevant context and reasoning constraints — otherwise, you can't expect it to behave better (in actual terms) compared to a slightly dumber model. When you start reasoning about the future in terms of AI, it's turtles all the way down (i.e. need AI to efficiently reason about the choices made by AI)