GoKawiilAnthropic launches Sonnet 5.5, touting 30% speed gain and lower token costs
Anthropic has released Sonnet 5.5, an update to its mid-tier AI model that the company says runs 30 percent faster than its predecessor and burns tokens more slowly, cutting costs. Anthropic says the model outperforms its more powerful Opus 5.5 on agentic coding benchmarks and now carries cyber capabilities strong enough to trigger the same safeguards applied to its Fable and Opus models. The company also says a refreshed version of Haiku, its smallest model, is coming in the next few weeks.
GoKawiil's interpretation of the reporting above, not reported fact.
The release suggests Anthropic is racing to keep its mid-tier offering competitive on cost and speed as OpenAI and Meta roll out their own new models in quick succession. Sonnet outperforming the larger Opus on agentic coding hints that model efficiency, not just raw scale, is becoming a key differentiator for AI labs. Extending stricter cyber safeguards to a mid-tier model also signals growing concern, per Anthropic's own framing, about smaller models carrying capabilities once reserved for flagship systems.
- Anthropic claims Sonnet 5.5 is 30% faster and cheaper to run than Sonnet 5
- Sonnet 5.5 reportedly beats the larger Opus 5.5 on agentic coding benchmarks
- A new Haiku model update is planned within weeks, amid rapid releases from OpenAI and Meta
Source: techcrunch.com — Lucas Ropek, 2026-09-28
Published there as: “Anthropic releases Sonnet 5.5, which it calls a significantly cheaper, faster work partner”
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