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Favicon for z-ai

Z.ai: GLM 5.3

z-ai/glm-5.3

Model weights
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GLM-5.3 is a large-scale reasoning model from Z.ai, built for complex software engineering and long-horizon agent tasks. It supports text input and output with a 1M-token context window, and improves on GLM-5.2 in coding and in the balance between performance and token efficiency.

Reasoning is always on and cannot be disabled. Reasoning efforts low, high, and max are supported; max is the default.

Modalities

In / Out Price

18% off

$1.148 / $3.608per 1M

Context

1M

Released

Aug 18, 2026

Compare
ProvidersPricingPerformanceUptimeBenchmarksAppsActivityFAQExplore

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 Exacto (highest tool-calling accuracy).

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.

Benchmarks

Scores on standardized evaluations. Higher percentages are better — and rank percentile shows where this model lands among all models on OpenRouter.

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.

Quick Start

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.

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10% off
$1.30$1.17$4.40$3.96$0.26$0.2341.78s41 tps
98.85%
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98.98%
$1.19$4.40$0.263.82s82 tps
99.65%
$1.25$4.40$0.261.01s23 tps
98.64%
$1.25$4.40$0.262.01s14 tps
96.67%
10% off
$1.40$1.26$4.40$3.96$0.26$0.2340.88s82 tps
100.00%
$1.35$4.40$0.239.89s39 tps
9.75%
$1.40$4.40$0.261.94s18 tps
99.95%
$1.40$4.40$0.261.62s52 tps
99.76%
$1.40$4.40$0.262.46s48 tps
99.67%
$1.40$4.40$0.262.54s44 tps
99.97%
$1.40$4.40$0.260.41s73 tps
97.12%
$1.40$4.40$0.260.91s29 tps
99.35%
$1.40$4.40$0.261.32s50 tps
95.26%
$1.40$4.40$0.260.66s99 tps
99.93%
$1.40$4.40$0.263.70s47 tps
98.78%
$1.40$4.40$0.141.24s55 tps
99.86%
$1.40$4.40$0.261.44s49 tps
99.94%
$1.40$4.40$0.263.17s29 tps
99.23%
$1.40$4.40$0.263.15s50 tps
99.88%
$1.75$5.50$0.3251.18s56 tps
84.93%
$2.10$6.60$0.211.39s79 tps
99.94%
18% off
$1.40$1.148$4.40$3.608$0.23$0.18866.65s35 tps
96.48%
$1.20$4.00$0.122.14s29 tps
95.64%
$1.15$3.50$0.103.07s21 tps
89.04%

Throughput

99tok/s

P50, best across providers

Latency

0.41s

P50, best provider

AutoExacto Benchmarks
GPQA DiamondTAU-Bench
DigitalOcean
90.6%79.3%
Phala
91.3%73.3%
Baseten
86.7%77.9%
AtlasCloud
86.5%78.0%
auto-routing
84.2%80.0%
Baseten
83.6%77.0%
+21 more providers
Uptime (3d)

100.00%

Availability (3d)

99.83%

Availability over the last 3 days

Last 72 hours
Availability 99.83%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.93%
Without Routing
97.77%

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 customization options.

1.
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.
321Btokens
2.
Favicon for https://claude.ai/apple-touch-icon.png
Claude Code
Claude Code is Anthropic's agentic coding tool that reads your entire codebase, plans and executes changes across files, runs tests, and iterates on failures, all from natural language prompts.
233Btokens
3.
Favicon for https://omp.sh/
omp
new
131Btokens
4.
Favicon for https://pi.dev/
pi
There are many coding agents, but this one is yours.
130Btokens
5.
Favicon for https://strix.ai/
Strix
new
96.1Btokens

Frequently asked questions

GLM-5.3 is a large-scale reasoning model from Z.ai, built for complex software engineering and long-horizon agent tasks. It supports text input and output with a 1M-token context window, and improves on GLM-5.2 in coding and in the balance between performance and token efficiency. Reasoning is always on and cannot be disabled. Reasoning efforts low, high, and max are supported; max is the default.

GLM 5.3 costs $1.148/M input tokens and $3.608/M output tokens, with separate rates for Cache Read at $0.1886/M tokens.

GLM 5.3 has a 1,310,720 token context window. It supports up to 1,048,576 completion tokens.

Yes. GLM 5.3 accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

GLM 5.3 is served by 24 providers on OpenRouter: Decart, Reka AI, AkashML, io.net, Wafer, DeepInfra, Inceptron, Morph and 16 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 5.3 was released on August 18, 2026.