Anthropic's 'Fennec' Leaked: Sonnet 5 Promises Superior Performance at Half the Cost?

product#llm📝 Blog|Analyzed: Feb 14, 2026 03:38
Published: Feb 5, 2026 08:02
1 min read
Qiita LLM

Analysis

Whispers of Anthropic's Claude Sonnet 5, codenamed "Fennec," are electrifying the AI community! This leaked information suggests significantly improved performance compared to Opus 4.5, coupled with a radical 50% reduction in inference costs. If true, this could revolutionize the accessibility and capabilities of cutting-edge LLMs.
Reference / Citation
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"Sonnet 5 is rumored to support 1 million tokens, which is five times more than the current Opus 4.5."
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Qiita LLMFeb 5, 2026 08:02
* Cited for critical analysis under Article 32.