Anthropic Releases Claude Opus 5.5 as OpenAI Coding Race Tightens
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Anthropic released Claude Opus 5.5 on September 22, 2026, pitching it as a cheaper, faster frontier model for long-running agentic coding and knowledge work. The confirmed OpenAI code-red episode remains a December 2025 ChatGPT push; public materials reviewed for this article did not establish a new code red specifically caused by Opus 5.5.
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