Anthropic released Claude Sonnet 5.5 on September 28, positioning the new model as a faster, lower-cost companion to Claude Opus 5.5 and a sharper challenger to OpenAI's GPT-6 Astra for coding and everyday agent work. The comparison is not a clean overall win for either lab: Sonnet 5.5 posts leading coding-value results, while Astra remains framed by OpenAI as its top-end model for frontier reasoning, computer use and science.
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