Brief
Anthropic Unveils Faster, Cheaper Sonnet 5.5 AI Model
The new model promises speed and cost savings for everyday tasks, including coding and office work.
By Felo News Desk · Published
Anthropic announced the launch of Sonnet 5.5 on 28 September 2026. The company claims the model is 30 % faster than Sonnet 5 and burns tokens more slowly, making it a cost‑effective assistant for coding and document creation. In benchmark tests, Sonnet 5.5 outperformed the higher‑tier Opus 5.5 on agentic coding tasks, reportedly due to its ability to spawn multiple agents within cost limits. Anthropic also said Sonnet 5.5 has cyber capabilities comparable to Opus 5.5 and will be subject to the same safeguards that apply to its Fable and Opus models. The lab plans to release a new Haiku model in the coming weeks, though no date has been set.
Key facts
- Sonnet 5.5 is 30% faster than Sonnet 5 (techcrunch.com)
- Sonnet 5.5 burns tokens more slowly than Sonnet 5 (techcrunch.com)
- Sonnet 5.5 outperforms Opus 5.5 on agentic coding benchmarks (techcrunch.com)
- Sonnet 5.5 will be subject to the same cyber safeguards as Fable and Opus (techcrunch.com)
- Anthropic plans to release a new Haiku model in the coming weeks (techcrunch.com)
What happens next
Anthropic will release a new Haiku model in the near future, with no firm date announced.
Sources
- [1] techcrunch.com — originally reported as “Anthropic releases Sonnet 5. 5, which it calls a significantly cheaper, faster work partner”
