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GPT-6 Astra Arrives on LMArena

After a teaser from LMArena, GPT-6 Astra went live on the platform with Battle and Agent modes for users to test and rate.

2026-09-04 ~ 2026-09-05 · 2 episodes · 4 posts

Episode 1 · LMArena Teases GPT-6 Astra Launch Alongside Zero-Cherry-Pick 3D Demos (2026-09-04, 2 posts)

LMArena announced GPT-6 Astra is coming to the Arena for user testing, and highlighted Peter Gostev's zero-cherry-pick stress tests, including 3D world generation benchmarked against Claude Fable 5.1.

GPT-6 Astra heads to LMArena after zero-cherry-picking 3D world-gen tests vs Claude Fable 5.1 — arena · 2026-09-04
GPT-6 Astra coming to LMArena after zero-cherry-picking 3D world-gen gauntlet vs Claude Fable 5.1 — arena · 2026-09-04

Episode 2 · LMArena Adds GPT-6 Astra in Battle and Agent Modes (2026-09-05, 2 posts)

LMArena now lets users test GPT-6 Astra in Battle Mode (anonymous model comparison) and Agent Mode (hands-on tasks like image editing and dashboard generation).

GPT-6 Astra now testable in LMArena's Battle Mode and Agent Mode — arena · 2026-09-05
LMArena adds GPT-6 Astra for testing in Battle and Agent modes — arena · 2026-09-05