Last refreshed 2026-05-22. Next refresh: weekly.
Why use GLM-5.1 on Vercel AI Gateway?
Vercel AI Gateway offers GLM-5.1 with pay-as-you-go pricing at $1.40/1M input tokens. Vercel AI Gateway is a unified AI proxy providing a single OpenAI-compatible API endpoint to 275+ models from 25+ providers including Anthropic, OpenAI, Google, Meta, Mistral, DeepSeek, xAI, Alibaba, Amazon, ByteDance, Cohere, MiniMax, MoonshotAI, KwaiPilot, Black Forest Labs, Recraft, Voyage AI, NVIDIA, and more.
Compare GLM-5.1 across 5 providers to find the best fit for your use caseSetup recipe
Python + curlpip install openaiexport AI_GATEWAY_API_KEY=...import os
from openai import OpenAI
client = OpenAI(
api_key=os.environ["AI_GATEWAY_API_KEY"],zai/glm-5.1Request example
import os
from openai import OpenAI
client = OpenAI(
api_key=os.environ["AI_GATEWAY_API_KEY"],
base_url="https://ai-gateway.vercel.sh/v1"
)
response = client.chat.completions.create(
model="zai/glm-5.1",
messages=[{"role": "user", "content": "Hello"}]
)
print(response.choices[0].message.content)Gotchas
- Use provider model ID "zai/glm-5.1", not the LLMReference slug "glm-5.1".
- creator/model-name e.g. kwaipilot/kat-coder-pro-v2
- The examples expect AI_GATEWAY_API_KEY; rename it only if your application config maps the new variable.
Compare GLM-5.1 Across Providers
| Provider | Input (per 1M) | Output (per 1M) |
|---|---|---|
| Z.ai | $1.40 | $4.40 |
| OpenRouter | $1.05 | $3.50 |
| Fireworks AI | $1.40 | $4.40 |
| Vercel AI Gateway | $1.40 | $4.40 |
| Novita AI | $1.38 | $4.40 |
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $1.40 |
| Output tokens | $4.40 |
Capabilities
About GLM-5.1
Post-training variant of GLM-5 from Zhipu AI with enhanced reasoning and coding capabilities. 754B parameters (40B active) in Mixture of Experts architecture. Optimized for complex agentic workflows and multi-step reasoning. Available via Z.AI API and open weights under the MIT license.
FAQ
What does GLM-5.1 cost on Vercel AI Gateway?
On Vercel AI Gateway, GLM-5.1 costs $1.4 per 1M input tokens and $4.4 per 1M output tokens.
What is the context window for GLM-5.1 on Vercel AI Gateway?
GLM-5.1 supports a 202,800 token context window on Vercel AI Gateway.
How does Vercel AI Gateway compare to other GLM-5.1 providers?
GLM-5.1 is available from 5 providers. The cheapest input pricing is $1.05/1M tokens from OpenRouter.
What API model ID do I use for GLM-5.1 on Vercel AI Gateway?
Use the model ID zai/glm-5.1 when calling Vercel AI Gateway's API.
Who created GLM-5.1?
GLM-5.1 was created by Zhipu AI as part of the GLM-5 model family.
Is GLM-5.1 open source?
GLM-5.1 is open source according to the seed data.