Photon Capital(@PhotonCap):- Anthropic released Claude Opus 5.5 on September 22, 2026, matching Claude Fable 5.1 performance at 40% lower cost than Opus 5. - Model shows strongest alignment scores in Anthropic's behavioral audit and improved resistance to prompt injection attacks. - Input/output tokens priced at $4/$20 per million (20% cheaper), cache reads at $0.20 per million (60% cheaper); generation speed improved over 30%. > Opus 5.5's substantial cost reduction and efficiency gains (particularly 60% cheaper cache reads) could accelerate adoption of Claude for agent-based and coding workloads in AI infrastructure, while its improved alignment metrics suggest Anthropic is maintaining safety focus alongside capability scaling.

2026.09.22 23:50

- Anthropic released Claude Opus 5.5 on September 22, 2026, matching Claude Fable 5.1 performance at 40% lower cost than Opus 5. - Model shows strongest alignment scores in Anthropic's behavioral audit and improved resistance to prompt injection attacks. - Input/output tokens priced at $4/$20 per million (20% cheaper), cache reads at $0.20 per million (60% cheaper); generation speed improved over 30%. > Opus 5.5's substantial cost reduction and efficiency gains (particularly 60% cheaper cache reads) could accelerate adoption of Claude for agent-based and coding workloads in AI infrastructure, while its improved alignment metrics suggest Anthropic is maintaining safety focus alongside capability scaling.