ZAI Reveals Stealth Model as GLM-5.3 Flash, Now on OpenRouter

ZAI confirmed its stealth Ox Alpha model is GLM-5.3 Flash, the first natively multimodal model in the GLM-5 series, and made it available on OpenRouter after the Ox Alpha free trial ended.

2026-08-26 ~ 2026-08-27 · 2 related posts

Full story(16 episodes)→

• Episode 1: Mystery model Ox Alpha stuns community; fingerprints point to Zhipu GLM-5.3(2026-08-21, 58 posts)
• Episode 2: OpenRouter's Mystery 'Ox Alpha' Model Identified as GLM(2026-08-21, 3 posts)
• Episode 3: Cola Launches Ox Model Claiming Terra-Level Capability at Flash Speed(2026-08-21, 2 posts)
• Episode 4: Mysterious Model Ox Alpha Gives Away 100T Tokens Daily, Sparking Power Questions(2026-08-21, 2 posts)
• Episode 5: Ox-Alpha Underperforms in Tests, Called Marketing Stunt(2026-08-22, 3 posts)
• Episode 6: Ox Alpha scores ~63% on full DeepSWE; earlier 80% was subset artifact(2026-08-22, 6 posts)
• Episode 7: Forensics Point to Zhipu's Unreleased GLM Behind Mystery Model Ox Alpha(2026-08-22, 31 posts)
• Episode 8: Ox Alpha Generates 64K-Token 3D Scene in One Prompt(2026-08-22, 2 posts)
• Episode 9: Mystery model Ox Alpha draws mixed reviews from early testers(2026-08-22, 6 posts)
• Episode 10: Mystery Model Ox Alpha Launches Free, Identity Unknown(2026-08-23, 3 posts)
• Episode 11: Mysterious Model Ox Alpha Debuts on OpenRouter, Sparking Speculation(2026-08-24, 5 posts)
• Episode 12: Leak: Ox Alpha Is GLM-5.3 Flash, 320B MoE at One-Tenth the Price(2026-08-25, 4 posts)
• Episode 13: Mystery model Ox Alpha confirmed as Zhipu's GLM-5.3-Flash, open weights coming tonight(2026-08-25, 17 posts)
• Episode 14: Stealth Model Ox Alpha Proves Mediocre at Coding, Trails Grok 4.6(2026-08-25, 3 posts)
• Episode 15: Mystery Model Ox Alpha Burns 42T Tokens in Six Days(2026-08-26, 3 posts)
• Episode 16: ZAI Reveals Stealth Model as GLM-5.3 Flash, Now on OpenRouter(2026-08-26, 2 posts)

• GLM-5.3 Flash Arrives on OpenRouter, Succeeding Ox Alpha — Teknium · 2026-08-26
• ZAI Launches GLM-5.3 Flash Model on OpenRouter — paulrich_nb · 2026-08-27