Anthropic has released Claude Opus 5.5, the first model in its Claude 5.5 family, with lower listed token prices than Opus 5 and broad cloud availability. Biology and cybersecurity use remain subject to verification programs because Anthropic classifies the model as comparable to Claude Mythos 5.1 in those areas.
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OpenAI has introduced GPT-6 Sol and GPT-6 Luna, adding cheaper models to its GPT-6 lineup while staging access across the API, ChatGPT Work and Codex. The release's performance figures are OpenAI evaluations, not independent benchmarks.