Opus 5.5 launch highlighted alongside GPT-6 Sol and Luna rollout

Opus 5.5 has launched. Its benchmarks were described as looking good and its price as very low; it was characterized as a model in the Fable 5.1 class but cheaper. The release was framed as the first model since a stated decision to pace frontier development. Claims that it is especially safe, capable, fast, inexpensive and lightweight were presented as characterizations, not independently verified results.

GPT-6 Sol and Luna were said to be starting to roll out, and OpenAI was said to have released something similar that day. A later exchange over whether the other model name was Luna or Terra ended with uncertainty: the speaker said they might have had it backwards.