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GLM 5.3 - API Pricing & Providers | OpenRouter Z.ai: GLM 5.3 z-ai/glm-5.3 Compare 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 $1.40 / $4.40per 1M Context 1M Released Aug 18, 2026 Compare Providers This model is hosted by one provider. OpenRouter forwards every request to it directly — no routing decisions to make. 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. 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. About Z.ai: GLM 5.3 OpenRouter makes Z.ai: GLM 5.3 available through a unified, OpenAI-compatible API using the model ID z-ai/glm-5.3. It is served by Z.ai. Z.ai: GLM 5.3 accepts text and returns text. It has a 1,048,576-token context window and a maximum output of 131,072 tokens. On OpenRouter, Z.ai: GLM 5.3 costs $1.40/M input tokens and $4.40/M output tokens, with separate rates for Cache Read at $0.26/M tokens. Effective pricing can be lower when prompt caching applies. It was released on August 18, 2026. More models from Z.ai GLM 5.2 GLM 5.1 GLM 5V Turbo 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 $1.40/M input tokens and $4.40/M output tokens, with separate rates for Cache Read at $0.26/M tokens. GLM 5.3 has a 1,048,576 token context window. It supports up to 131,072 completion tokens. Yes. GLM 5.3 accepts tools and tool_choice for function calling. It supports response_format for JSON output, without JSON-schema enforcement. GLM 5.2, GLM 5.1, GLM 5V Turbo and 9 more are other text models from Z.ai. GLM 5.3 was released on August 18, 2026. Latency / throughput $1.40$4.40$0.266.03s30 tps 100.00% Throughput 30tok/s P50, best across providers Latency 6.03s P50, best provider Uptime (3d) 99.91% Availability (3d) 99.65% Availability over the last 3 days Last 72 hours Availability 99.65% 3 Days Ago2 Days AgoYesterdayNow Availability over the last 24 hours OpenRouter Availability 99.65% 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. 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. 2.04Btokens 2. 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. 1.72Btokens 3. Oh-My-Pi new 539Mtokens 4. Kilo Code Kilo Code is an open-source AI coding agent that works across VS Code, JetBrains, and CLI to help developers ship code faster with agentic workflows. 341Mtokens 5. Z Code new 301Mtokens