Claude Opus 5.5 is not just another chat-model upgrade; Anthropic positions it as a long-running agentic coding and knowledge-work model, priced at $4 per million input tokens and $20 per million output tokens, with adaptive thinking always on.[1][2] The useful question for builders is narrower: if you already use GPT-6 Astra, Claude Fable 5.1, Opus 5, Cursor, Claude Code, Codex or a custom agent harness, does Opus 5.5 change the model-routing decision for real coding work?
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