Today, many users discovered that Claude3.5-sonnet is no longer accessible to free users. The commonly used Claude3.5Sonnet model, which was previously available to free users, can no longer be selected; instead, users can only access the relatively simple Claude3Haiku model.

In fact, a similar situation occurred a month ago when the official website claimed that Claude3.5Sonnet experienced "partial operational disruptions." It remains unclear whether this is the same scenario this time.

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Claude3.5Sonnet, launched by Claude in June this year, is a new generation of AI models that has surpassed its competitors and predecessor, Claude3Opus, in multiple evaluations. It maintains a comparable operational speed and cost to mid-range models, setting a new industry standard.

Key Features:

Outstanding Performance: Claude3.5Sonnet has set new industry benchmarks in areas such as graduate-level reasoning, undergraduate-level knowledge, and coding abilities.

Enhanced Understanding: The model has made significant strides in understanding subtle nuances, humor, and complex instructions, capable of creating high-quality content in a natural and engaging tone.

Improved Speed: Claude3.5Sonnet operates twice as fast as Claude3Opus. In internal proxy coding evaluations, it solved 64% of the problems, far exceeding Claude3Opus's 38%, making it particularly suitable for handling complex tasks.

Breakthrough in Visual Processing: Claude3.5Sonnet surpasses Claude3Opus in standard visual benchmark tests, especially in tasks requiring visual reasoning such as interpreting charts and graphs, and accurately transcribing text from imperfect images.

The closure of the Claude3.5Sonnet model for free users may affect the user experience, particularly for those who rely on its advanced features. Users who need to handle complex tasks and visual processing might be compelled to seek alternative solutions or upgrade to paid services.

Currently, the specific reasons for this closure are unclear, and there has been no official statement on when it will be reopened. For users who depend on the Claude3.5Sonnet model, this is undoubtedly an issue to watch. We will continue to monitor the progress of this matter and update relevant information promptly.