LLMs & Foundation Models•1 min read
Anthropic introduces Claude Opus 5.5
Anthropic announced Claude Opus 5.5 on September 22. It says typical workloads cost 40% less than Opus 5; the claim comes from Anthropic's own tests.
What was announced
Anthropic introduced Claude Opus 5.5 on September 22, 2026. Anthropic describes it as the first model in its Claude 5.5 family.
What the company reports
Anthropic says the model costs 40% less to run than Opus 5 on typical workloads in its own tests. It lists API prices of $4 per million input tokens and $20 per million output tokens. These are company-reported figures, not independent measurements by Neural Pulse.
Read Anthropic’s announcement for availability, evaluation details, and limitations.
Read the cited source
This article summarizes its cited source. Its claims have not been independently verified.
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