Apr 7, 2026
GLM 5.1 takes the top open-weight spot on the Vals Index
We’ve finished our evaluation of GLM 5.1 and it’s now the #1 open-weight model on the Vals Index, unseating Kimi K2.5, and ranking #6 overall on the index.
Key takeaways:
- GLM 5.1 leads open-weight models on coding benchmarks, ranking #1 open-weight on Vibe Code Bench, Terminal-Bench 2.0, and SWE-bench Verified.
- It’s also #1 on our in-house Finance Agent (v1.1).
- It ranks #1 on MedCode, but is lower on TaxEval (#8 open-weight) and CaseLaw (#13 open-weight).
- It comes in at $0.22/test on the index — more expensive than Kimi K2.5 ($0.12/test), but cheaper than GLM 5, and far below models like Claude Sonnet 4.6 ($0.80) or GPT 5.4 (xhigh) ($0.67).
Eval settings: temperature=1, top_p=0.95, 131k max output tokens, run via the native GLM API. Context window: 200k tokens.
Congrats to the team at z.AI on the release!