Anthropic releases Claude Sonnet 5.5, a faster, cheaper sibling to Opus 5.5

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Anthropic releases Claude Sonnet 5.5, a faster, cheaper sibling to Opus 5.5

The release post lists the evaluations and where Anthropic says Sonnet trails Opus, useful for choosing between them.

Anthropic released Claude Sonnet 5.5, saying it runs 30%+ faster than Sonnet 5 and costs up to 30% less for most work, at the same list price of $2/$10 per million input/output tokens. Anthropic reports 70.6% on Terminal-Bench 4.0 and says Haiku 5.5 will follow in the coming weeks.

Read it at the source

AnthropicIntroducing Claude Sonnet 5.5 ↗ Hacker NewsDiscussion: Sonnet 5.5 ↗

Cascadic Analysis 2

UndertowLoss of meaningful human control as capability and autonomy increase

What hidden risk could pull against this, even if the news is good?

Faster and up to 30% cheaper is the profile of a model meant to run constantly inside loops and pipelines. The more work flows through it without a person reading each result, the further one mistaken pattern can repeat before anyone notices.

UndertowBenchmark scores can overstate real-world reliability

What hidden risk could pull against this, even if the news is good?

A big jump on one agentic coding benchmark shows progress on that benchmark’s tasks. It doesn’t tell you how often the model fails quietly on yours, which is the number that decides whether it’s safe to stop checking.

Anthropic releases Claude Sonnet 5.5, a faster, cheaper sibling to Opus 5.5

Further down the stream