AI Tools — Blog

Claude Opus 5.5 banner showing the 22 September 2026 release, $4 input and $20 output API pricing, $0.20 cache reads, 40% lower typical workload cost, 1M-token context, 128K max output and five effort levels
AI Tools

Claude Opus 5.5 Explained: What's New, What It Costs, and Which Plans Include It

Anthropic's Claude Opus 5.5 matches Fable 5.1 on most work at 40% lower running cost than Opus 5. Here are the published benchmarks, the new $4/$20 API price list, how the Fable-style safeguards route flagged requests, what breaks when you migrate from Opus 5, and which Claude plans give you the model.

smileemir 35 min
Claude Fable 5.1 banner: Anthropic's frontier model released on 1 September 2026, with its 1M-token context, 128K max output, five effort levels, and API pricing of $10 in and $50 out per million tokens
AI Tools

Claude Fable 5.1 Explained: What's New, What It Costs, and Which Plans Include It

Anthropic released Claude Fable 5.1 on 1 September 2026. This guide covers what changed versus Fable 5 – benchmarks, the five effort levels, 75% cheaper cache reads, fewer safeguard false positives and the new watermark – plus which Claude plans include it and where it fits alongside the software you already run.

smileemir 27 min