According to the company’s official announcement, the new model is billed as its “most impressive Sonet model yet”. Meaning it is capable of planning, using tools like browsers and terminals, and operating autonomously – all at a level previously reserved for larger, expensive systems.
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Anthropic says the Sonnet 5 significantly improves reasoning, coding and knowledge-work benchmarks over its predecessor Sonnet 4.6 and performs close to the company’s flagship Opus 4.8 model, while costing significantly less to run.
And in an industry increasingly suffering from sticker shock on value tokens, Sonnet offers a brief respite. The model launches with introductory pricing of $2 per million input tokens and $10 per million output tokens until August 31, after which standard pricing of $3 per million input tokens and $15 per million output tokens takes effect.
mashable light speed
On security, Anthropic reports Sonnet 5 shows lower rates of hallucinations, chatter and other undesirable behaviors than its predecessor, as well as better resistance to early-injection attacks. The company noted that the model’s cybersecurity capabilities are well below its Opus-class and Mythos-class systems, and the Sonnet 5 launches with cybersecurity measures enabled by default as a precaution.
Notably absent from Anthropic’s announcement: specific data on improving hallucination rates. The company only offers general claims of “lower rates” compared to Sonnet 4.6 rather than benchmark data.
The release made no mention of the models’ energy consumption or environmental footprint, which is a real problem for the AI industry as models become more capable and computationally intensive.
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Sonnet 5 is now available across all cloud plans, including Free, Pro, Max, Team, and Enterprise tiers, as well as through Cloud Code and Cloud Platform via API under the model name cloud-sonnet-5.
This release comes after several weeks of anticipation in the tech press. As we reported in February, reports have been circulating for some time that Anthropic was preparing a Sonet update to bump Opus-level performance at a steep discount — a prediction that tracks with Tuesday’s official rollout.
Subject
artificial intelligence anthropic
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