Pro/zai-org/GLM-5.1

GLM-5.1 is positioned by Z.ai as its most advanced model in the GLM family, marking the next step beyond the GLM-5 Turbo generation. The April 2026 pricing reset reflects how Z.ai is treating this release as a premium, agentic-focused offering rather than an incremental efficiency update, aligning its commercial trajectory with other Chinese vendors like Alibaba and Tencent that have similarly repriced frontier models in response to sustained agentic-AI demand.

For practitioners, the practical implication of GLM-5.1 is a higher per-token cost envelope relative to the GLM-5 Turbo baseline it supersedes, paired with an enterprise and developer audience that needs agentic reasoning, tool use, and reliable structured output for production pipelines. Teams evaluating it should weigh the price premium against the agentic workloads where it is marketed to lead, since the cost delta is a conscious vendor choice tied to demand for autonomous, tool-driven applications rather than a routine list-price adjustment.

SiliconFlow (China)Pro/zai-org/GLM-5.1glm

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Quick Info

Provider: SiliconFlow (China)
Model key: Pro/zai-org/GLM-5.1
Release date: Apr 8, 2026
Last updated: Apr 8, 2026
Input modalities
Output modalities
Capabilities

Cost

Input token cost: $1.40
Output token cost: $4.40

Limits

Output tokens: 205,000 tokens
Context window: 205,000 tokens

Transparent token rates

Compare Pro/zai-org/GLM-5.1 pricing

Rates are shown per one million tokens. Combined means one million input plus one million output tokens.

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Latest news about Pro/zai-org/GLM-5.1

SiliconFlow (China)

Coverage

Interconnects' "Latest open artifacts #21" roundup (May 16, 2026, by Florian Brand and Nathan Lambert) explicitly names GLM-5.1 among a wave of frontier open-model releases including DeepSeek V4, Kimi K2.6, MiMo 2.5, and Gemma 4. The piece situates GLM-5.1 within the Center for AI Standards and Innovation (CAISI) open- For developer audiences, the roundup underscores that GLM-5.1 is treated as a peer of DeepSeek V4 and Kimi K2.6 in independent open-frontier coverage, with capabilities characterized via IRT-based aggregations rather than single-leaderboard wins. CAISI's nine-benchmark suite (including CTF-Archive-Diamond, PortBench, A

SiliconFlow (China)

Coverage

Z.ai raises prices for its most advanced AI model, GLM-5.1, by at least 8% compared to GLM-5 Turbo, joining Alibaba and Tencent as demand for agentic AI surges. This signals vendor-level price pressure for advanced models and could increase deployment and inference costs for developers and enterprises.