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Claude Opus 5

3 posts on claude opus 5 on The AI Career Lab. Working guides, how-to walkthroughs, and tool comparisons for professionals applying AI to real workflows.

Guides

Guide

Sonnet 5 vs Haiku 4.5 vs Opus 5 (Sept 2026): Which Claude Model to Use

Sonnet 5 for most work, Opus 5 for the hardest, Haiku 4.5 for volume — plus where Fable 5.1 fits and whether Haiku 5 exists. Updated Sept 2026.

May 20, 202612 min read

Other

Industry News

What Was the HEIF Heist? Security Researchers Used Claude Opus 5 to Breach OpenAI in Under 72 Hours.

In September 2026, a three-person research team called Hacktron AI used Claude Opus 5 to exploit a vulnerability in OpenAI's community forum and gain access to employee ChatGPT and Codex accounts — and from there, OpenAI's internal GitHub. Here's what happened, what was accessed, and what it means for professionals who rely on these tools.

Sep 18, 20268 min read
Industry News

Claude Opus 5 Is Here: What Professionals Need to Know (July 2026)

Anthropic launched Claude Opus 5 on July 24, 2026 — near Fable 5's frontier intelligence at half the price. Here's what changed, what the benchmarks actually mean, how the new effort toggle works, and whether you need to do anything.

Jul 24, 20267 min read

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