Anthropic has introduced three Claude 5.5 models: Opus 5.5, Sonnet 5.5 and Haiku 5.5, with release dates ranging from September 22 to October 7, 2026.
Anthropic has introduced three models in its Claude 5.5 series: Claude Opus 5.5, Claude Sonnet 5.5 and Claude Haiku 5.5. The announcements were published on Anthropic's website between September 22 and October 7, 2026.
Anthropic introduced Claude Opus 5.5 on September 22, 2026. The company said the model leads in agentic coding and knowledge work. Anthropic also said it costs 40% less to run than Opus 5 on typical workloads.
Anthropic introduced Claude Sonnet 5.5 on September 28, 2026. The company described it as a clear upgrade over Claude Sonnet 5. Anthropic said it runs 30%+ faster and costs up to 30% less for most work.
Anthropic introduced Claude Haiku 5.5 on October 7, 2026. The company described it as its fastest, most capable small model. Anthropic said it is built for high-volume work like summarization, subagents, and browser use.
The three models span different price and performance tiers within Anthropic's Claude lineup. Opus 5.5 is positioned for agentic coding and knowledge work, Sonnet 5.5 is positioned as an upgrade over Sonnet 5 with speed and cost improvements, and Haiku 5.5 is positioned for high-volume tasks such as summarization, subagents, and browser use.
Sources
This article was drafted with AI assistance and checked against the sources above. Company claims are reported as claims. Cover image is AI-generated.
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