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Anthropic[1][2]: "Today, we're launching Claude 3.5 Sonnet" and it "is now available for free on Claude.ai"; the page header now shows Jun 21, 2024, but TechCrunch[4] and AWS both published the launch on 20 June 2024 and the model ID is claude-3-5-sonnet-20240620.Anthropic releases Claude 3.5 Sonnet, which beats its own Claude 3 Opus at the mid-tier model's $3 per million input tokens and twice Opus's speed, alongside the new Artifacts workspace in Claude.ai.
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