Claude Sonnet 5 | First impressions

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Издатель Jul 1, 2026

https://arena.ai/agent

Anthropic just dropped another model — Sonnet 5. Arena’s AI capability lead, Peter Gostev, put it through loads of real-world tests in agent mode on the Arena: 3D scene generations, React websites, interactive UIs, data visualizations, and more. It goes head-to-head against GPT 5.5 Extra High, Opus 4.8, Fable, and the open-source GLM to see where it actually lands — not just on the benchmarks, but on the stuff that matters when you're actually building.

The verdict? Sonnet 5 is a step up from 4.6, but it gets edged out by GPT 5.5, runs surprisingly close to a cheaper open-source model on front-end tasks, and has a curious habit of burning through tokens on validation loops — sometimes costing more than Fable.

0:00 Intro – Anthropic drops Sonnet 5
0:15 Benchmarks look odd – costing more than Fable?
0:35 How we're testing – Agent Mode on Arena
1:06 3D Test: Sagrada Familia vs GPT 5.5 & Fable
2:36 3D Test: Voxel Game – controls & fidelity compared
3:50 3D Test: Best Sonnet generations (floating islands, White House)
7:19 UI Test: Children's Museum React website
10:04 UI Test: City Parade & Street Festival website
12:53 Data Visualization tests
14:14 Knowledge Work: AI model research report
19:34 Educational App: Pompeii interactive experience
22:43 The token/cost problem – validation loops explained
26:24 Final Verdict – is Sonnet 5 worth it?

#arenaai #claudesonnet #llm #agenticai