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Favicon for z-ai

Z.ai: GLM 5.1

z-ai/glm-5.1

Model weights
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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.

Modalities
In / Out Price
31% off
$0.966 / $3.036per 1M
Context
205K
Released
Apr 7, 2026
Compare
ProvidersPricingPerformanceUptimeAppsActivityFAQExplore

Providers

Different companies host the same model. OpenRouter routes your request to one of them based on the routing mode you pick — Balanced (price + speed), Nitro (fastest), or Floor (cheapest).

Pricing

The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.

Performance

Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better).

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

Activity

Token volume and request traffic to this model over time.

API

Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.

Not currently available through EU in-region routing. In-region routing docs

Explore more models

AI Model RankingsRanking
Latency / throughput
31% off
$1.40$0.966$4.40$3.036$0.26$0.17943.04s27 tps
99.97%
$0.980$3.080$0.09802.41s28 tps
91.75%
$1.190$3.740$0.60001.75s47 tps
100.00%
$1.210$4.200$0.60001.43s28 tps
88.31%
$1.260$3.960$0.23401.10s60 tps
100.00%
$1.330$4.180$0.24701.51s58 tps
100.00%
$1.380$4.400$0.26002.84s44 tps
100.00%
$1.400$4.400--0.43s40 tps
94.24%
$1.400$4.400$0.26000.96s54 tps
99.96%
$1.400$4.400$0.26001.58s60 tps
100.00%
$1.400$4.400$0.26000.50s100 tps
99.93%
$1.400$4.400$0.26009.82s21 tps
100.00%
9% off
$1.54$1.401$4.84$4.404$0.286$0.26030.82s68 tps
98.15%
Throughput
100tok/s

P50, best across providers

Latency
0.42s

P50, best provider

AutoExacto benchmarks
GPQA DiamondTAU-BenchVenice89.0%76.2%Alibaba Cloud Int.87.4%75.7%Phala86.5%75.3%StreamLake85.4%74.5%Z.ai84.3%74.0%
+9 more providers
Uptime (3d)The model was reachable. Request routed to a provider.
100.00%
Availability (3d)The model returned inference from any provider. Errors and empty responses count against it.
99.26%

Availability over the last 3 days

Last 72 hours
Availability 99.26%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.56%
Without Routing
97.27%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and provider routing options.

1.
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Mira is the leading AI agent inside Telegram
Mira is a Telegram-native AI assistant.
13.7Btokens
2.
Favicon for https://janitorai.com/
Janitor AI
Janitor AI is a chatbot platform where users create and chat with custom AI characters for interactive roleplay, storytelling, and immersive fiction.
6.34Btokens
3.
Favicon for https://nousresearch.com
Hermes Agent
Hermes Agent is an open-source, self-improving AI agent by Nous Research that runs persistently with memory across sessions, and builds reusable skills from experience. It comes with 40+ built-in tools, including web search, browser automation, and vision, plus scheduled automations and subagents.
3.22Btokens
4.
Favicon for https://openclaw.ai/
OpenClaw
OpenClaw is an open-source AI agent that connects to your messaging apps and takes real actions on your behalf, from running commands and browsing the web to managing files and sending emails.
3.09Btokens
5.
Favicon for https://sillytavern.app/
SillyTavern
SillyTavern is the LLM frontend for power users, a chat interface that connects to any model and gives deep control through character creation, roleplay, and prompt customization.
2.07Btokens

Frequently asked questions

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,...

GLM 5.1 costs $0.966/M input tokens and $3.036/M output tokens, with separate rates for Cache Read at $0.1794/M tokens.

GLM 5.1 has a 204,800 token context window. It supports up to 128,000 completion tokens.

Yes. GLM 5.1 accepts tools and tool_choice for function calling on 12 of the 13 providers serving it, and requests that send tools are routed to those providers. It also supports structured outputs via a JSON schema in response_format.

GLM 5.1 is served by 13 providers on OpenRouter: StreamLake, Chutes, SiliconFlow, Phala, AtlasCloud, Alibaba Cloud Int., NovitaAI, Nebius Token Factory and 5 more. Requests are routed to the best available provider, with automatic failover to the others, and you can pin or exclude providers with provider routing.

GLM 5.1 was released on April 7, 2026.