Synapse Garden
Z.AI · Single modalityReleased 2026-04-07

glm-5.1

zai/glm-5.1 id

GLM-5.1 delivers a major leap in coding capability, with particularly significant gains in handling long-horizon tasks. Unlike previous models built around minute-level interactions, GLM-5.1 can work independently and continuously on a single task for more than 8 hours—autonomously planning, executing, and improving itself throughout the process—ultimately delivering complete, engineering-grade results.

ReasoningTool useChat
Type
Use glm-5.1
# Drop-in OpenAI-compatible client
$ import { generateText } from 'ai'
$ 
$ const { text } = await generateText({
$   model: 'zai/glm-5.1',
$   baseURL: 'https://synapse.garden/api/v1',
$   apiKey: process.env.MG_KEY,
$   prompt: 'Why is the sky blue?',
$ })
202.8K
CONTEXT WINDOW
64K
MAX OUTPUT
$1.54/M
INPUT · PER M
$4.84/M
OUTPUT · PER M
PRICING

List prices, every modality.

RatePer million tokens · USD
Input$1.54/M
Output$4.84/M
Cache read$0.286/M
Honest list pricesHow we calculate prices
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FAQ · GLM-5.1

Frequently asked

01 / 04

How do I call glm-5.1 from my code?

Use the OpenAI or Anthropic SDK and point baseURL at https://synapse.garden/api/v1. Set model: ‘zai/glm-5.1’ and supply your Synapse Garden API key. No code changes beyond the base URL.

02 / 04

How much does glm-5.1 cost?

Input: $1.54/M per million tokens. Output: $4.84/M per million tokens. The free tier includes a million tokens every month at no cost.

03 / 04

What's the context window for glm-5.1?

glm-5.1 supports a context window of 202.8K tokens, with a maximum output of 64K tokens.

04 / 04

Do I need a separate Anthropic or OpenAI account?

No. Synapse Garden is the single API surface — one key gives you OpenAI, Anthropic, Google, Meta, Mistral, DeepSeek, xAI, Cohere, and more. Billing, rate limits, and audit logs are unified.

READY

Try glm-5.1 in three minutes.

Sign up, create a key, drop our base URL into your existing client. The free tier includes a million tokens every month — no credit card.

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