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Z.ai (Zhipu AI)

GLM-5

VS
Z.ai (Zhipu AI)

GLM-5.1

✍️ Analysis by:the whichllmmodel Editorial Team|📅 Updated: June 2026

Decision Recommendation

👑 Editorial Verdict: GLM-5.1 strictly dominates GLM-5 across all major dimensions. It is not only more cost-effective (blended cost of $1.50 vs $1.55 per 1M tokens) but also delivers superior coding accuracy (58.4% vs 0% on SWE-bench) and faster generation speeds (0 tps vs 0 tps). Unless you have platform lock-in, GLM-5.1 is the clear and optimal choice for all development workloads.

Model Specs

GLM-5

Benchmarks & Scores

Coding (swe-bench-pro)
N/A
Reasoning (gpqa-diamond)
86%

Cost & Performance

Cost (per 1M tokens)
$1.55Input: $1.00 | Output: $3.20
Speed
N/A
Context Window
204.8k tokens
Model Specs

GLM-5.1

Benchmarks & Scores

Coding (swe-bench-pro)Winner (+)
58.4%
Reasoning (gpqa-diamond)Winner (+0.2%)
86.2%

Cost & Performance

Cost (per 1M tokens)
$1.50Input: $0.98 | Output: $3.08
Speed
N/A
Context Window
204.8k tokens

Frequently Asked Questions

GLM-5.1 is cheaper than GLM-5. GLM-5.1 has a blended cost of $1.50/1M tokens, which is about 1.0x cheaper than GLM-5 at $1.55/1M tokens.

Speed metrics are currently unavailable for both models.

GLM-5.1 is better for coding tasks. It scores 58.4% on coding evaluations (swe-bench-pro) compared to GLM-5 which scores N/A.

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