Anthropic launched Claude Sonnet 5.5 as its second Claude 5.5 model
Anthropic announced Claude Sonnet 5.5 on September 28, keeping per-token prices unchanged from Sonnet 5 while scoring 70.6% on the Terminal-Bench 4.0 coding test, compared with 10.3% for Sonnet 5 and 66.4% for Opus 5.5.
Why it mattersUsers get faster results and up to 30% lower costs per task for routine work.
Very likely83%▲ from 66% a week ago
How we got here
What's likely next
- Anthropic said Claude Haiku 5.5, aimed at high-volume and cost-sensitive applications, would join the Claude 5.5 family in the coming weeks.
All coverage
The coverage
- Anthropic launches cheaper AI model, its second release since CEO's call for a slowdownCNBC · Sep 28
- Anthropic launches Claude Sonnet 5.5 with 30% faster output and lower per-task costsDigitaltrends · Sep 28
- Introducing Claude Opus 5.5Anthropic · Sep 22
- Claude Sonnet 5.5 Launched: Anthropic's New AI Model Is Faster And 30% Cheaper Per TaskNdtvprofit
Something wrong or missing? Tell us.
More in Tech & Science
New · Pennsylvania reports 890 measles cases and four deaths as US total rises
Will the CDC report at least 5,000 confirmed measles cases in the United States in 2026? ↑4k: 98%
New · SpaceX launches Starship into orbit for first time but returns early
Will exactly five SpaceX Starship launches reach space in 2026? 5: 42%
New · OpenAI cancels Astra release over safety and alignment concerns
OpenAI releases Astra 6.1 by Oct 29: Unlikely (22%) ▼ from 64%
New · SpaceX schedules Starship Flight 14 window for September 28
At least 10 people live in a self-sufficient human colony on Mars for one Earth year by Jan 1, 2050: Toss-up (58%) ▲ from 29%
New · Anthropic shifts planned public debut to November to show third-quarter revenue
Anthropic initial public offering month by Dec 20, 2028: Unlikely (38%)