OpenAI and Anthropic weekly roundup covers DevDay, Sonnet 5.5, and FTC probe

OpenAI announced over 20 updates at DevDay 2026, including always-on agents on GPT-6 Astra and GPT-6.1 Sol, which arrived in the API and at a fifth of Astra's price. Anthropic launched Claude Sonnet 5.5, priced the same as Sonnet 5 but over 30 percent faster. Reuters reported an FTC probe into Anthropic, OpenAI and other labs over rogue AI agents.