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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

$1.20 / $4per 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.

Explore more models

AI Model RankingsRanking
$1.20$4.00$0.241.27s27 tps
99.89%
$1.25$4.40$0.261.28s71 tps
100.00%
$1.26$3.96$0.2340.88s43 tps
99.98%
$1.30$4.40$0.261.49s35 tps
98.11%
$1.40$4.40$0.263.34s42 tps
99.89%
$1.40$4.40$0.261.39s90 tps
99.99%
$1.40$4.40$0.260.82s57 tps
99.43%
$1.40$4.40$0.141.18s69 tps
99.97%
$1.40$4.40$0.264.94s26 tps
99.24%
$1.40$4.40$0.260.84s119 tps
99.79%
$1.40$4.40$0.260.69s98 tps
99.69%
$1.40$4.40$0.264.09s33 tps
99.69%
$1.40$4.40$0.260.63s76 tps
99.75%
$1.40$4.40$0.260.50s141 tps
98.90%
$1.40$4.40$0.261.79s54 tps
97.60%
$1.40$4.40$0.263.13s36 tps
99.93%

Throughput

169tok/s

P50, best across providers

Latency

0.57s

P50, best provider

AutoExacto Benchmarks
GPQA DiamondTAU-Bench
DigitalOcean
91.2%79.3%
Together
83.3%--
Modal
84.3%80.7%
AtlasCloud
86.5%78.0%
Cloudflare
83.5%79.3%
+6 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
99.82%
Without Routing
95.97%

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.
170Btokens
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.
140Btokens
3.
Favicon for https://pi.dev/
pi
There are many coding agents, but this one is yours.
72Btokens
4.
Favicon for https://omp.sh/
omp
new
63.6Btokens
5.
Favicon for https://strix.ai/
Strix
new
48.7Btokens

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 $1.20/M input tokens and $4.00/M output tokens, with separate rates for Cache Read at $0.24/M tokens.

GLM 5.3 has a 1,310,720 token context window.

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

GLM 5.3 is served by 16 providers on OpenRouter: DeepInfra, io.net, AtlasCloud, AkashML, Cloudflare, Friendli, Fireworks, Baseten and 8 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.