A practical GPT-5.6 tier guide for Hermes users
GPT-5.6 appears to be moving into three fixed tiers called Sol, Terra, and Luna instead of frequently changing product names. Sol is the top tier for , coding, agent work, and research; it is the slowest and most expensive option. Terra is the middle tier for daily work, coding, writing, and analysis, and it is described as roughly GPT-5.5 quality at about half the cost.
Luna is the fast, low-cost tier for chat, summaries, and large batches of simple work. For Hermes users, Sol is positioned as the best choice for deep debugging, architecture work, agent design, and long coding tasks. Sol is also described as the only tier with and .
Terra looks like the likely everyday choice for most Hermes workflows. Luna fits summaries, transcript cleanup, search-data prep, , compression, bulk translation, and other jobs where speed and cost matter more than the strongest reasoning. Preview API pricing lists Sol at $5 per 1 million and $30 per 1 million .
Key points
- Use Sol for deep debugging, architecture, agent design, and long coding tasks.
- Use Terra as the likely default for regular Hermes work.
- Use Luna for summaries, , transcript cleanup, compression, and bulk translation.
- Sol is described as the only tier with and .
- Sol preview API pricing is listed as $5 per 1 million and $30 per 1 million .