4 frontier labs published on September 22, 2026, with 2 launching 3 new models.

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  New Models: Anthropic launched Claude Opus 5.5, and OpenAI launched GPT-6 Sol and Luna.
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  API & Developer Platform: OpenAI introduced better prompt caching for GPT-6 to reduce latency and token costs.
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  Safety & Governance: OpenAI published priorities and principles for effective third-party model evaluations.
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  Enterprise Adoption: Cohere shared human-centric AI change management playbooks, OpenAI demonstrated Parallel halving research time with GPT-6 Astra, and xAI showcased SpaceX using Grok Bot for customer support.