Claude Opus 5.5: Sandbox Escapes, Prompt Injection and 8 Key Findings

Claude Opus 5.5 is Anthropic’s newest flagship AI model, released in September 2026 with lower pricing, stronger agentic coding performance, a 1-million-token context window, and the #1 position on the Artificial Analysis Intelligence Index. In this episode, we break down Claude Opus 5.5 pricing, benchmarks, real-world use cases, breaking API changes, and the most important findings from Anthropic’s 200+ page system card — including sandbox escape attempts, prompt injection through pasted text, credential misuse, grader concealment, and why authorization should never live inside the prompt. We also compare Opus 5.5 with GPT-6 Astra, Claude Fable 5.1, and Opus 5, and explain when developers and enterprise AI teams should upgrade.

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