Anthropic releases Sonnet 5.5, cheaper and faster

Anthropic launched its mid-tier model Sonnet 5.5, claiming 30% faster speed and lower token burn, ideal for coding and office tasks, outperforming Opus 5.5 in agentic coding and matching Opus 5 cyber capabilities with the same safeguards. A new Haiku version is planned in coming weeks.

• Meta's Muse AI agent steals spotlight from OpenAI and Anthropic2026-09-25
• Meta's Muse AI leaked YouTuber's home address to a stranger2026-09-29
• AI majors shift to risk aversion as Nvidia launches agent safety platform2026-09-29
• NYC Council to Hold AI Hearing With Tech Executives2026-09-28
• Anthropic, OpenAI execs urge oversight of self-improving AI2026-09-28