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Anthropic Claude Sonnet 5.5 Model Leaked, Outperforms GPT-6 in Tests

A new version of Anthropic's Claude AI model, Sonnet 5.5, has reportedly leaked online. Early testing suggests the model significantly outperforms competitors like OpenAI's GPT-6 in specific tasks.

28 September 2026

AI research company Anthropic is poised to release its Claude Sonnet 5.5 model, with unofficial reports and leaked information indicating its imminent arrival. The model has reportedly been undergoing internal testing, with early benchmarks suggesting it surpasses competitors, including OpenAI's recently launched GPT-6 Sol, particularly in coding and agent capabilities.

The leaked details also highlight Sonnet 5.5's competitive pricing strategy. It is said to be significantly more affordable than Anthropic's top-tier Opus 5.5 model, with costs as low as $2 per million input tokens. This pricing could reshape the competitive landscape of AI services.

Evidence of the new model, identified by the configuration string "claude-sonnet-5-5", has surfaced in software artifacts, signaling its readiness for deployment. Developers have shared demonstrations comparing Sonnet 5.5's code generation for user interfaces and animations, claiming it outperforms both OpenAI's GPT-6 Sol and Astra models in these areas.

While Anthropic has not officially commented on the leak or confirmed a release date, the widespread technical details suggest an impending launch. If the reported performance and pricing are accurate, the Claude Sonnet 5.5 model could present a substantial challenge to existing market leaders in the advanced AI sector.

Original source: ithome.com