WhichAI / Models / GLM-5.1

GLM-5.1

· verified October 14, 2026

public free open-weights in Generator api coding

Provider

Statuspublic

AA Intelligence Index26.1 (official, read October 14, 2026)

Released2026-04-07

Context window205K

Modalitiesn/a

API price $/1M (in / out)$1.33 / $4.18 (OpenRouter)

Speedn/a

AccessOpen weights

In one line

The previous Z.ai release - still strong, quickly superseded by 5.2.

Coding78

Reasoning68

Writing60

Agents & tools72

Category scores (0-100) are WhichAI blended ratings: public category leaderboards plus editorial judgment. Guidance, not official measurements.

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Artificial Analysis Intelligence Index, official scale (the number published on artificialanalysis.ai), relayed by OpenRouter and refreshed automatically: last read October 14, 2026. 209 models carry a current official measurement. A value marked ~ is converted from an earlier snapshot because no current measurement is published; an unmeasured model is never ranked. Context, price, modality and listing dates come from the public OpenRouter model list (refreshed automatically on the live site; static copy retrieved October 3, 2026) and vendor pages. Missing values are not published or not yet verified - shown as -. Sources are linked inside the app (the Ranking chapter and About > Methodology).