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GPT-5.6 Sol, Terra, Luna debut in limited preview as OpenAI’s newest frontier models
Bay Area Times
June 29, 2026
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Top stories today:
- GPT-5.6 Sol, Terra, Luna debut in limited preview
- Anthropic’s Mythos 5 cleared for wider U.S. release
- Oracle -18% last week, worst since 2001, amid AI spending concerns
- Polymarket tops $1B ARR 6 weeks after U.S. exchange launch
- OpenAI to hire Apple’s Vision Pro, smart glasses chief Paul Meade
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Listen to our AI-generated podcast summarizing today’s newsletter (beware of hallucinations):
1. GPT-5.6 Sol, Terra, Luna debut in limited preview as OpenAI’s newest frontier models
GPT-5.6 Sol matched Anthropic’s Mythos Preview using 33% of the output tokens, OpenAI said:
~20 companies have received U.S. government-approved access, with participants disclosed to the Trump admin.
Sol is OpenAI’s new flagship model, while Terra is “balanced” for everyday work, and Luna is “a fast and affordable” model.
Access is expected to expand to more companies next week, OpenAI said.
OpenAI said it doesn’t see the current approach as ideal or sustainable but is cooperating with the government.
OpenAI is hoping to make GPT-5.6 generally available in the coming weeks.
GPT-5.6 Sol has included an Ultra mode for complex workflows and higher performance
GPT-5.6 Sol remains well below the threshold for the most concerning Mythos use cases, according to its system card.
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3. Anthropic’s Mythos 5 cleared for wider U.S. release as Fable 5 talks continue
100+ U.S. institutions have been allowed access to Mythos 5.
“[A]ppropriate safeguards are in place to permit certain trusted partners to access the Claude Mythos 5 Model,” Commerce Secy. Lutnick wrote in a letter to Anthropic.
The U.S. government letter is silent on Fable 5 access.
This week: Fable 5’s access could be restored by the Trump admin, however.
Restrictions on foreign-national access remain in place.
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