What is GPT-5.6 and what are Sol, Terra, and Luna?
GPT-5.6 is OpenAI's new model family with three tiers: Sol, the flagship, priced at $5 input / $30 output per million tokens; Terra, a balanced mid-tier model at $2.50 / $15; and Luna, a fast, affordable option at $1 / $6. Sol leads on coding, biology, and cybersecurity benchmarks.
Answered in
OpenAI Shipped GPT-5.6 After 12 Days Under White House LimitsOpenAI publicly released GPT-5.6 on July 9, two weeks after limiting it to government-vetted partners over cybersecurity concerns.
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