Tag

Claude Opus 55

3 posts on claude opus 55 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 5.5 (Sept 2026): Which Claude Model to Use

Sonnet 5 for most work, Opus 5.5 for the hardest, Haiku 4.5 for volume — plus where Fable 5.1 fits and whether Haiku 5 exists. Updated Sept 22, 2026 for Opus 5.5.

May 20, 202612 min read

Comparisons

Comparison

Claude Opus 5.5 vs Fable 5.1 (Sept 2026): Which to Use, and What It Does to Your Usage Limits

Opus 5.5 performs at Fable 5.1's level on most work at $4/$20 instead of $10/$50, and it is inside your Pro plan where Fable is not. Here's the plan-by-plan access table, the community's limits math, the five effort levels explained, and when Fable 5.1 is still worth it.

Sep 27, 202610 min read

Other

Industry News

Claude Opus 5.5 Is Here: What Professionals Need to Know (September 2026)

Anthropic launched Claude Opus 5.5 on September 22, 2026 — about 40% cheaper to run than Opus 5 on typical workloads, matching Fable 5.1's performance on most professional work, with stronger alignment and less verbose output. If you're on Pro, Max, Team, or Enterprise, you already have access.

Sep 22, 20267 min read