Zvi (Don't Worry About the Vase)·3 weeks ago·
22
● 3 sources
Claude Opus 5.5’s system card lays out updated classifier and evaluation results, including claims about its cyber strength and evidence on alignment-risk and R&D capabilities. METR’s preliminary AI R&D estimate is about 1.5X overall acceleration from AI, with roughly a 30% chance of 2X. Anthropic says it will adjust how it tests biology by dropping “helpful-only” versions and otherwise relies on largely the same oversight/safeguards while deploying Opus 5.5 to the public with cyber controls.
Anthropic launched Claude Opus 5.5, positioning it as the first release in its Claude 5.5 model family. Default usage is priced to cost 40% less than Opus 5, with input tokens at $4 per million and output tokens at $20 per million. Access and limits also change, including higher five-hour usage limits for several plans and rate-limit reset for subscription users.
Anthropic shipped Claude Opus 5.5 as the new default Claude 5.5-family model, with Anthropic claiming task capability similar to Claude Fable 5.1 plus speed and writing improvements. Token pricing was cut 20%, from $5/$25 to $4/$20 per 1M input/output tokens. AINews is migrating to Opus 5.5 immediately and broader Claude usage defaults, session limits, and rate-limit handling are updated alongside widespread API price reductions.
Every AI story that matters,
in your inbox by 8am.
TLDRocket reads all relevant sources, removes duplicate coverage, and summarises the
day in two minutes. Follow companies and topics for alerts, or get the
briefing in Slack. Free, no spam, unsubscribe anytime.
Reading TLDRocket needs no cookies, and the readership counts we rely on come from
our own cookieless analytics. Google Analytics is the exception: it sets cookies and
reports to Google, so it stays switched off until you allow it. You can change your
mind any time from “Cookie settings” in the footer.
Strictly necessary
Session security and form protection (tldrocket-session,
XSRF-TOKEN, 2 hours). The site cannot work without them,
so they need no consent.
Always on
Google Analytics 4 (_ga,
_ga_<id>, up to 2 years). Measures which
stories and sections readers use. Google acts as a third-party processor and may
store the data outside the EU. No advertising, no profiling, no data sold.
