Z.ai Launches GLM-5.3 API for Coding and Long-Horizon Agents

GLM 5.3 is Z.ai's coding and agentic model, released August 14, 2026, built on the same 743B-parameter base as GLM 5.2 with every gain coming from scaled post-training rather than a new architecture. Its headline results are large: Terminal-Bench 3.0 jumps from 4.6 to 28.3, DeepSWE v1.1 from 46.2 to 66.9, and CyberGym reaches 84.5%, the top score in Z.ai's launch chart. Nearly every benchmark is vendor-reported by Z.ai. Artificial Analysis independently scores it 60 on its Intelligence Index at high reasoning effort, ranking it 9th of 186 models. The API opened on August 18, 2026 at $1.40 input and $4.40 output per million tokens, matching GLM 5.2. The GLM Coding Plan starts at $18 a month. [...] ## How much GLM 5.3 costs and how to access it GLM 5.3 is available two ways: a per-token API and a subscription Coding Plan. Both are summarized below. _Table 3: GLM 5.3 access and pricing (as of August 2026)_ | Access route | What it is | Cost | --- | Per-token API | Direct API

GLM 5.3 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. Text 1.3M context$1.15 / 3.50 [...] Skip to content Image 1: OpenRouterImage 2: OpenRouter Search⌘K ModelsBenchmarksChatRankingsAppsEnterpriseDocs Sign Up Sign Up Image 3: Favicon for z-ai # Z.ai: GLM 5.3 ### z-ai/glm-5.3 Model weights ComparePlaygroundGet API Key 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

FAQ ## Frequently asked questions GLM 5.3 is Z.ai's flagship large language model, released on August 14, 2026, optimized for complex software engineering, long-horizon tasks, and cybersecurity. It improves over GLM 5.2 by 50% in coding performance through scaled post-training, not architecture changes, and supports function calling, web search, and structured output. GLM 5.3 is open weights under the Z.AI License, allowing use, modification, and redistribution with attribution. The weights were released two weeks after launch following a safety review. It is not free to run — pricing is $1.75 per 1M input tokens and $5.50 per 1M output tokens on Venice. [...] Ask anything... AboutFeatures VVVDIEM Pricing API + DocsFAQsPrivacyBlogMediaCareersBrand KitChangelogDownloadStatus Page Store Log in LLMAnonymized # GLM 5.3 Z.ai's GLM 5.3 is a code-optimized, reasoning-first LLM with emergent cybersecurity capabilities — open weights, 1M-token context, and private on Venice. Start

Today, Z.ai GLM-5.3, described as "Built to Code. Ready for Cyber Defense," is available on Bitdeer AI Model Studio, bringing one of the strongest open-weight coding and agentic models to our serverless inference platform, built for secure, scalable enterprise AI. You can start calling it through a single API today, without provisioning or managing the underlying GPU infrastructure. ## What Is GLM-5.3? [...] That approach concentrated gains in two areas: long-horizon coding and cybersecurity. Z.ai reports GLM-5.3 is its most powerful open-weights coding model to date, with the largest jumps on the hardest, most agentic benchmarks, and says the model's vulnerability-discovery ability advanced further than the team expected, with GLM-5.3 beginning to reason across multiple stages of an exploit and form coherent plans for complete exploitation chains. ## Key Specifications [...] Bitdeer AI Cloud # GLM-5.3 now live on Bitdeer AI Model Studio, built to Code and Ready for Cyber Defense #

Zai's GLM-5.3 API is now live, built for coding, defensive cybersecurity, and long-horizon agentic tasks. Pricing stays the same as GLM-5.2, and

189 @Zai_org Z.ai @Zai\_org GLM-5.3 API is now live. - Built for coding, defensive cybersecurity, and long-horizon agentic tasks - Priced the same as GLM-5.2 - Available via the official API and partner model gateways Get started: docs.z.ai/guides/llm/glm… 8:46 PM · Aug 18, 2026518.4KViews 189 @kienbuilds Kien Pham @kienbuilds Aug 18 Another cheap open model with near Fable 5 capabilities? GIF 2 @ConnorTalksAI Connor @ConnorTalksAI Aug 18 priced same as GLM 5.2 GIF @MrAhmadAwais Ahmad Awais @MrAhmadAwais Aug 18 Already live in @CommandCodeAI GOAT plan has 2x credits of GLM 5.3 🐐 @CommandCodeAI Command Code Aug 18 [...] Log inSign up ## Post # Z.ai on X: "GLM-5.3 API is now live. - Built for coding, defensive cybersecurity, and long-horizon agentic tasks - Priced the same as GLM-5.2 - Available via the official API and partner model gateways Get started: @Zai_org Z.ai @Zai\_org GLM-5.3 API is n