Tencent shipped Hy4 on 2026-11-04 : first vision + first computer-use for the Hy line, with the API live on Tencent Cloud TokenHub and third-party routes including OpenRouter. The useful builder story is not “another open-source flagship pitch.” It is four concrete checks: (1) today is an API / product day — weights and the system card are promised in the coming days / shortly , not a download you can pin yet, (2) OpenRouter model id tencent/hy4 is text+image→text with a 1,048,576 context card and a separate 65,536 max-completion cliff, (3) TokenHub / OR route pricing is on a 50% promo through 2026-12-31 where cache-read rates dominate agent-loop cost, and (4) vendor financial / hallucination / GameDev deltas are a map for your golden eval — not a merge-into-prod certificate.

TechNode reports ~770B parameters ( vendor via TechNode — label as such). Press positions Hy4 among leading open-source models and acknowledges responsible-release framing around cyber and bio.…