GLM-5.3-Flash Priced at 1/40th of Claude Opus 4.8, Targets AI Agent Workloads

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Zhipu AI's GLM-5.3-Flash, a 320-billion-parameter open-source model, is priced at $0.30 per million input tokens and $1.20 per million output tokens internationally — roughly one-fortieth of Claude Opus 4.8's official list price. The model ranked first on OpenRouter under the anonymous name 'Ox Alpha' on its launch day and processed approximately 62 trillion tokens within its first six days. GLM-5.3-Flash supports a 1.04-million-token context window and native multimodal inputs including text, images, video, and files, placing it in the same low-cost tier as DeepSeek V4 Flash while scoring higher on the Artificial Analysis Intelligence Index. Analysts note the 1/40th cost ratio compares against Opus 4.8's public list price, not enterprise-negotiated rates, and that per-task costs depend on how many retries or additional calls a workload requires. The model's low input-token pricing is seen as particularly advantageous for long-context agentic applications where repeated context re-reads dominate overall API spend.

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