Head to Head

GLM 5.1 vs zai-org/GLM-5.1

Pricing, experience, and what the community actually says.

★ Our Pick

GLM 5.1

GLM 5.1

Starting at

$0.01 per 1k tokens (Input)

Refund

Credit-based system; non-refundable once consumed

Try Free →
zai-org/GLM-5.1

zai-org/GLM-5.1

Starting at

$1.40 / 1M input tokens

Refund

Pay-as-you-go model; no refunds on consumed tokens. Unused credits may expire per provider terms.

Try Free →

Our Take

GLM 5.1GLM 5.1

“Yes for developers and enterprises targeting global markets, specifically those needing robust performance in East Asian languages without sacrificing reasoning quality.”

GLM 5.1 is a top-tier contender for users requiring deep Chinese-English bilingual proficiency and agentic reasoning. While it faces stiff competition in pure English creative writing, its logic and technical instruction-following are on par with the industry's leading models.

zai-org/GLM-5.1zai-org/GLM-5.1

“Worth it for developers and enterprises needing a highly capable, commercially permissive model for software engineering and complex multi-step agents, provided latency and token costs fit the budget.”

GLM-5.1 delivers frontier-level reasoning and coding performance under an open MIT license, but its high token cost and slower inference speed make it best suited for specialized, high-value tasks rather than high-volume, low-latency applications.

Pros & Cons

GLM 5.1

✓Top-tier bilingual (CN/EN) performance
✓Very low hallucination rate in technical tasks
✓Highly competitive token pricing
✓Excellent 2M context window stability
✗Safety filters can be overly restrictive
✗Prose can feel overly formal or 'dry'
✗Support documentation is best in Mandarin

zai-org/GLM-5.1

✓Strong multi-step reasoning and coding performance
✓Commercially permissive MIT license
✓Large 200k context window
✓Open-weight with transparent architecture
✓High benchmark scores (Intelligence Index: 51)
✗Higher token pricing compared to many open models
✗Slower inference speed (~44 t/s)
✗High verbosity increases output costs
✗Text-only input/output requires separate vision models
✗Heavy hardware requirements for self-hosting

Full Breakdown

Category
GLM 5.1GLM 5.1
zai-org/GLM-5.1zai-org/GLM-5.1

Overall Rating

★4.6 / 5
4.2 / 5

Starting Price

$0.01 per 1k tokens (Input)
$1.40 / 1M input tokens

Learning Curve

Medium. While the API is OpenAI-compatible, mastering the model's specific prompt sensitivities for complex reasoning takes a few days of experimentation.
Moderate. Requires familiarity with OpenAI-compatible SDKs, prompt engineering for reasoning modes, and token budget management due to verbosity.

Best Suited For

Software engineers building autonomous agents, researchers requiring long-context analysis, and businesses operating in bilingual environments.
Software engineering teams, AI agent developers, and researchers requiring strong multi-step reasoning and open-weight deployment flexibility.

Support Quality

Reliable for enterprise tiers with dedicated Slack/Lark channels; community support is active but primarily in Mandarin.
Standard developer documentation and community support via GitHub and Hugging Face. No dedicated enterprise SLA is publicly advertised for the open-weight version.

Hidden Costs

Storage fees for long-term vector embeddings if using their integrated RAG solution.
High verbosity can significantly increase output token consumption. Self-hosting requires substantial GPU infrastructure due to the 754B parameter size.

Refund Policy

Credit-based system; non-refundable once consumed
Pay-as-you-go model; no refunds on consumed tokens. Unused credits may expire per provider terms.

Platforms

Web API, Private Cloud Deployment, iOS/Android (via ChatGLM app)
Cloud API, Self-hosted (GPU), Hugging Face, ModelScope

Features

Watermark on Free Plan

✓ Yes
✗ No

Mobile App

✓ Yes
✗ No

API Access

✓ Yes
✓ Yes
GLM 5.1 Review →Try Free →
zai-org/GLM-5.1 Review →Try Free →