Claude Sonnet 5.0 heads straight down the middle of the road to dodge controversy
Claude Sonnet 5.0 heads straight down the middle of the road to dodge controversy
Publish Date: 2026-07-01 17:33:00
Source Domain: www.theregister.com
devops
Safer, cheaper, and nothing to do with cybersecurity
Anthropic has released the latest version of its mid-sized model, Sonnet 5, which the company claims is its most “agentic” yet.
For developers writing agents to automate tedious and recurring tasks, Sonnet 5 promises improved capabilities in reasoning, tool use, coding, and knowledge work. This version is also less likely to pull embarrassing (for Anthropic) gaffes of misunderstanding, so the company asserts.
“Our safety assessments found that Sonnet 5 shows an overall lower rate of undesirable behaviors than Sonnet 4.6, and is generally safer to use in agentic contexts,” the company asserted in an introductory blog post on Tuesday.
Sonnet 5 is smarter at refusing malicious requests and resisting prompt-injection attempts. It doesn’t hallucinate as often and doesn’t suck up to the user so much (“sycophancy”) as did its older brown-nosing Sonnet 4.6 sibling. It is also more aware of, and can block, user misuse and deception, the benchmarks in Anthropic’s System Card seem to indicate.
Sonnet is the default model for Claude Free and Pro users, and is also available to the token-pinching Max, Team, and Enterprise customers.
The benchmarks also indicate Sonnet 5’s performance can come close to that of Anthropic’s flagship enterprise-focused Opus 4.8, but can execute the same tasks more cost effectively. For Opus, Anthropic charges $5 per million input tokens and $25 per million output tokens.
Starting in September, Sonnet users will pay $3 per million input tokens and $15 per million output tokens, though Anthropic is running a special through the end of August where tokens will only be $2 per million inputs and $10 per million outputs.
So users trimming their token budgets can run jobs through Sonnet instead of Opus, the company suggests.
The 5.0 release offers a new setting to adjust the model’s effort…
