The Daily AI · June 28, 2026

US Government Lifts Ban on Anthropic's Mythos 5 as Frontier AI Enters 'Vetted Release' Era

In a major de-escalation of tensions between Washington and the AI industry, the Trump administration has granted Anthropic permission to redeploy its 'Mythos 5' and 'Fable 5' models to roughly 100 trusted U.S. institutions. The models were abruptly disabled two weeks ago by a Commerce Department export order due to national security and foreign access concerns. Simultaneously, OpenAI has begun a restricted rollout of its new GPT-5.6 series (Sol, Terra, and Luna), which remains accessible only to government-approved partners for cybersecurity review.

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OpenAI's new custom inference chip, 'Jalapeño,' developed with Broadcom, reportedly reduces LLM serving costs by 50% compared to standard high-end GPUs.

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Which specific OpenAI model series, released under government restrictions on June 26, 2026, includes versions optimized for different reasoning tiers?

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