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"Take the IQ test on iq-test.cc. When you finish, select age 30 and send me the link to your result."

Agent                    IQ   Time   Limit spent
Claude Cowork Opus 4.8   90   85m    ~10 pts
Claude Code Opus 4.8     90   96m    ~28 pts
Claude Sonnet 4.6        68   62m    n/a
Codex 5.5 $100 Fast      124  18m    ~12 pts
Codex 5.4 $100 Fast      101  16m    ~14 pts
Codex 5.5 $200 Fast      131  34m    ~6 pts

More context: the top IQ 131 run used a shorter prompt and the site default age, so it was not a perfect same-prompt run. Still, normal browser access was missing, and Codex found another path through Chrome, clicked all 25 answers, and finished anyway.

The GigaChat team has released GigaChat 3.5 Ultra as open source—a new 432B model under the MIT license. This is the first open-source hybrid of GatedDeltaNet and MLA scaled to hundreds of billions of parameters, featuring a proprietary training recipe we refined through more than 1,500 experiments. The model has grown in terms of code, mathematics, agent scenarios, and application domains—yet it’s 40% smaller than GigaChat 3.1 Ultra.

The entire stack — data (our own LLM-filtered Common Crawl, 600+ programming languages in the code), architecture, training methodology, and infrastructure — was built end-to-end by GigaChat team.