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Claude Opus 4.5: what is it like โ€” and how much will it cost?
Technology

Claude Opus 4.5: what is it like โ€” and how much will it cost?

social posts and investigative write-ups have pointed to an upcoming Claude Opus 4.5 (often shortened to โ€œOpus 4.5โ€) โ€” internally referenced by some sources as Neptune V6 โ€” and to the model being shared with external red-teamers for jailbreak testing. Public details are still fragmentary, so this article collects the available reporting, explains what the leak implies about capability and safety, and gives a grounded estimate of likely pricing and how Opus 4.5 might stack up against Googleโ€™s Gemini 3 and OpenAIโ€™s GPT-5.1.

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