Articles tagged "Claude Opus 5"

**Anthropic released Claude Opus 5 on July 24, 2026.** **Pricing holds at $5 / $25 per M tokens**, unchanged from Opus 4.8, while **Frontier-Bench v0.1 jumps 18.7% → 44.4% (xhigh)**, **OSWorld 2.0 goes 55.7% → 70.57%**, and **ARC-AGI-3 goes 1.52% → 30.16%**. It ships a **1M context window (default = maximum) with 128K max output (300K via the Batches API)**, and drops the minimum cacheable prompt to 512 tokens. The **new `xhigh` effort level** — above high, below max — targets agentic runs of 30+ minutes and actually beats max (43.3%) on Frontier-Bench. **Breaking changes**: thinking cannot be disabled at `xhigh` or `max` (the API returns a 400), **Opus 4.8 is now legacy, and Opus 4.1 retires August 5, 2026**. SWE-bench Verified hits 96.0%, but SWE-bench Pro at 79.2% stays just short of Fable 5's 80.0% — Opus 5 replaces Opus 4.8, not Fable 5.