Shortly after Anthropic released Opus5.5, industry insiders broke the news: several developers on the X platform revealed that the dedicated model identifier for Claude Sonnet5.5, "claude-sonnet-5-5," has already appeared in the official configuration and is now officially undergoing a gradual test in Claude Code.

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According to real-world test data from multiple internal testers, Sonnet5.5's overall performance is extremely impressive. In pure front-end UI animation generation and daily coding tests, it demonstrated an extraordinary code intuition and a natural human-machine interaction feel. Its actual performance not only fully surpasses OpenAI's recently released GPT-6Sol, but also approaches OpenAI's flagship GPT-6Astra in some advanced coding and agent capabilities.

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In terms of pricing strategy, this new model, dubbed the "king of cost-effectiveness," is also highly competitive. According to leaks, the input price for a million tokens is as low as $2, and the output price is $10, with cache retrieval costing only $0.20. This strategy of bringing cutting-edge capabilities to a low price has been widely viewed as a precise counterattack by Anthropic against OpenAI's annual developer conference (DevDay).

As Anthropic continues to accelerate model iteration through the efficient data flywheel of AI-assisted R&D, the full rollout of Sonnet5.5 is expected to completely reshape the mid-range and everyday development market. Developers can simply perform specific instruction tests in Claude Code to have the opportunity to verify whether they have been successfully routed to the 5.5 version.