Anthropic launches the Claude 5.5 family with Opus and Sonnet
Anthropic has launched the Claude 5.5 model family, featuring Opus 5.5 and Sonnet 5.5. The new AI models demonstrate significant performance gains in coding and agentic workflows.
What happened?
Anthropic has released its new Claude 5.5 family, which includes the flagship model Claude Opus 5.5 and the faster Claude Sonnet 5.5. This new generation is specifically optimised for coding and agentic workflows, where AI performs complex tasks independently. Sonnet 5.5 is described as 30 percent faster than its predecessor, Sonnet 5.
Key facts
| Lanseringsdatum | 1 oktober 2026 |
|---|---|
| Sonnet 5.5 prestanda (Terminal-Bench 4.0) | 70,6% |
| Sonnet 5 prestanda (Terminal-Bench 4.0) | 10,3% |
| Hastighetsökning Sonnet 5.5 jämfört med Sonnet 5 | 30% snabbare |
Why it matters
The development illustrates the AI market's shift from basic chatbots to agentic tools capable of advanced problem-solving and bug fixing over time. By improving the balance between cost, speed, and reasoning, Anthropic is challenging other competitors in automated software development.
Who is affected?
The launch primarily impacts software developers, data engineers, and companies building AI agents or automated coding tools. End-users who rely on Claude for document generation and problem-solving will also benefit from increased speed and stronger reasoning capabilities.
Impact on the EU
The models are being rolled out globally via Anthropic's API and platforms, making them available to users and companies within the EU in accordance with current data protection regulations.
What else you should know
The source reports a dramatic increase in the Terminal-Bench 4.0 benchmark, rising from 10.3 percent for Sonnet 5 to 70.6 percent for Sonnet 5.5, indicating a significant focus on agentic coding.
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