GLM-5.1 review, price and benchmarks (2026)

public free open-weights in Generator coding

Provider

Statuspublic

AA Intelligence Index40.2 (July 16, 2026 snapshot)

Releasedn/a

Context windown/a

Modalitiesn/a

API price $/1M (in / out)n/a

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The previous Z.ai release - still strong, quickly superseded by 5.2.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

Alternatives worth a look

DeepSeek V4 Flash (DeepSeek) · AA 40.3Free chat app · open weights · cheapest DeepSeek API
GPT-5.4 mini (OpenAI) · AA 40API (cheap tier) · serves ChatGPT free-tier overflow
Grok Build 0.1 (xAI) · AA 39.8Inside Grok Build (xAI's coding agent/CLI)

Open GLM-5.1's official app ↗ Open in the WhichAI app Not sure? Take the 30-second finder

Artificial Analysis Intelligence Index, 2026 rebased scale (top models ≈ 55–60). Snapshot: July 24, 2026 (BenchLM mirror), retrieved July 26, 2026. Context, price and release data come from vendor pages and public pricing mirrors (retrieved July 19, 2026). Missing values are not published or not yet verified - shown as -. Sources are linked inside the app (Model guide and About > Methodology).