GoKawiilAnthropic launches Claude Sonnet 5.5, its faster mid-tier AI model
Anthropic released Claude Sonnet 5.5, replacing Sonnet 5 as its medium-sized model, a week after debuting Opus 5.5. The company says the new model runs over 30% faster and uses fewer tokens while keeping Sonnet 5's pricing of $2 per million input tokens and $10 per million output tokens. Sonnet 5.5 is also the first Sonnet-tier model to ship with cybersecurity safeguards similar to those used in Anthropic's top-tier Opus models.
GoKawiil's interpretation of the reporting above, not reported fact.
Keeping prices flat while boosting speed suggests Anthropic is trying to make its mid-tier offering more competitive on cost-efficiency rather than raw capability, which could pressure rivals offering similarly priced mid-size models. Extending advanced safety safeguards down to the Sonnet tier may also reflect growing pressure on AI companies to standardize security measures across their product lines, not just flagship models. The rapid succession of Opus and Sonnet updates points to an accelerating release cadence in Anthropic's competition with OpenAI and Google.
- Claude Sonnet 5.5 replaces Sonnet 5 as Anthropic's medium-tier AI model.
- It offers over 30% faster output and uses fewer tokens while keeping the same pricing as Sonnet 5.
- It's the first Sonnet model to include cybersecurity safeguards comparable to Anthropic's top-tier Opus models.
Source: 9to5mac.com — Zac Hall, 2026-09-28
Published there as: “Anthropic upgrades Claude with new Sonnet 5.5 model, details here”
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