If you don’t name the GPT-5.6 variant, you’re effectively buying Sol

你刚刷到这条消息，本来准备顺手划走，但又怕自己错过了真正会影响下一步判断的那一点。

最容易做错的，是The new GPT-5.6 family: Luna, Terra, Sol；代价往往是如果只盯表面热闹，你很容易在错误方向上花掉时间、预算和注意力。；我先给一个保守判断：不写子型号，就等于默认买 Sol。。

You see “The new GPT-5.6 family: Luna, Terra, Sol,” assume the family name is the safe middle option, and keep scrolling. That is where time, budget, and attention get wasted.

My conservative read is simple: if you don’t name a sub-model, you’re effectively buying Sol.

In plain English, the generic gpt-5.6 label is not neutral. The current guidance says it routes to Sol, while Terra and Luna have to be requested by name. For a lot of teams, the “safe default” is actually the premium default.

The pricing gap makes this a decision, not trivia. As of 2026-07-09, Sol is $5 input / $30 output per 1M tokens. Terra is $2.50 / $15. Luna is $1 / $6. A model update is worth your attention only if it changes your next move. Here, the next move is to pin Luna, Terra, or Sol by workload instead of assuming the alias is neutral.

This is not a “never use Sol” argument. Harder coding or higher-stakes reasoning may justify it. My boundary is narrow: this is based only on the current guidance and the 2026-07-09 pricing page for the new GPT-5.6 family, not production evals or user reports. If this clears up the decision for your team, share it with the person who still thinks the alias is the safe default.

真正该讨论的是：The new GPT-5.6 family: Luna, Terra, Sol