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Applied AI·September 28, 2026·1 min read

Anthropic releases Claude Sonnet 5.5 with the cyber limits it reserved for its best models

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Sonnet 5.5 jumping from 10.3% to 70.6% on Terminal-Bench 4.0 — and inheriting frontier-grade cyber guardrails and reasoning-extraction blocks — compresses the gap between “mid-tier” and flagship models. For engineering leaders, this widens the zone where you can get near-top performance at lower cost while still meeting security expectations, but you’ll need to re-run your own evals, not just trust the benchmark.