Claude Opus 4.8 vs ChatGPT 5.5 : a Stepping Stone to Anthropic’s Mythos Series
Summary
This article compares Claude Opus 4.8 with ChatGPT 5.5 and focuses on Anthropic’s latest model improvements. It highlights better benchmark performance, stronger agentic workflows, and new controls such as effort control and improved alignment. It also notes the model’s 1 million token context window and unchanged pricing, while pointing out that efficiency still trails GPT-5.5. The piece ends by looking ahead to Anthropic’s planned Mythos series as the next step in its model roadmap.
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Anthropic
$10M to $25M