Sonnet 5.5
4 storiesSonnet 5.5 is a mid-tier model from Anthropic, positioned for faster speed and lower token burn in coding and office tasks. Anthropic claims it is 30% faster, outperforms Opus 5.5 in agentic coding, and matches Opus 5 cyber capabilities with the same safeguards. Vercel data placed it second in two-week adoption behind TypeSafe AI's Jev, and CNBC reported Anthropic framing it as improving existing tasks rather than pushing capability frontiers.
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Vercel's AI gateway data shows Jev, a lightweight decision model from TypeSafe AI, was used by 35% of paid teams within two weeks of launch, nearly double the reach of second-place Sonnet 5.5 — the fastest two-week adoption Vercel has recorded. Released in limited form on September 15, Jev constrains outputs to run cheaper and faster for classification, prompting rival offerings from OpenAI and Amazon. Open source models now account for over 70% of tokens but under 25% of spend on the gateway.
Major AI players are shifting from speed to safety: Nvidia rolled out a software platform to contain AI agents, OpenAI scrapped GPT-6.1 Astra over safety concerns, and Anthropic released Sonnet 5.5, stressing it improves existing tasks rather than pushing capability frontiers. Nvidia also announced a $150 billion buyback, lifting its shares, while Michael Burry warned the AI bubble may burst sooner than later.
Anthropic launched its mid-tier model Sonnet 5.5, claiming 30% faster speed and lower token burn, ideal for coding and office tasks, outperforming Opus 5.5 in agentic coding and matching Opus 5 cyber capabilities with the same safeguards. A new Haiku version is planned in coming weeks.
Anthropic released Opus 5.5, claiming new state-of-the-art coding and knowledge work performance, beating the larger Fable model on many benchmarks. Output pricing drops to $20 per million tokens from $25, with faster, less compute-intensive serving and clearer communication. Sonnet 5.5 and Haiku 5.5 are due in coming weeks.
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The A.I. Daily
Vercel data: Jev is fastest-adopted AI model ever