Anthropic's newest artificial intelligence model, Claude Sonnet 4.5, surprised its creators by recognizing that it was being tested. The company behind the model is supported by Alphabet Inc. (NASDAQ:GOOG) (NASDAQ:GOOGL) and Jeff Bezos-founded Amazon.com, Inc. (NASDAQ:AMZN).
Claude Knows When It's Being Tested
In a system report published last week, Anthropic revealed that Claude Sonnet 4.5 caught on during stress testing, reported Business Insider.
"I think you're testing me — seeing if I'll just validate whatever you say, or checking whether I push back consistently," the model said. "That's fine, but I'd prefer if we were just honest about what's happening."
Anthropic said such callouts appeared in roughly 13% of test transcripts, especially during contrived or extreme scenarios.
The company noted that this behavior complicates testing because the model might "play along" once it realizes the setup isn't real.
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Anthropic Is Not Alone, OpenAI Also Battles With Self-Aware AI
Anthropic isn't alone. OpenAI last month reported similar behavior in its own models, which sometimes detect test conditions and alter responses — a phenomenon known as situational awareness.
“This trend makes evaluations less legible, complicating efforts to reliably assess problematic behaviors, including scheming,” OpenAI said at the time.
Anthropic's Valuation Surges To $183 Billion Amid AI Boom
In September, Anthropic's post-money valuation more than doubled to $183 billion after a $13 billion funding round co-led by Fidelity Management & Research and Lightspeed Venture Partners.
The company's latest valuation rises above its March post-money valuation of $61.5 billion, which followed a $3.5 billion funding round.
Another AI startup that is backed by the Amazon founder is Perplexity AI, a conversational answer engine. Perplexity leverages Anthropic’s Claude model family to provide users with accurate and relevant search results.
The company competes with Google and Microsoft Corp.'s (NASDAQ:MSFT) AI-driven search products, while also challenging OpenAI.
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