Z.ai: GLM 5.3 Flash

GLM 5.3 Flash is a model from Z.ai that accepts text, image, and video input and returns text. It offers a context window of 1,048,576 tokens and allows up to 943,718 completion tokens, so long documents, extended transcripts, and lengthy generated outputs fit within a single request. It supports tool calling and a reasoning mode. Structured output support is not specified, and its weights status is not listed, so teams that need guaranteed schema adherence or self-hosting should confirm before committing. Pricing is $0.0261 per million input tokens and $0.90 per million output tokens. That makes input-heavy workloads such as large-context retrieval, video or image analysis, and document review very inexpensive, while output-heavy generation costs considerably more per token. Its blended benchmark score of 70.6 comes from a single independent benchmark, so its standing is only lightly evidenced. Shortlist it for cost-sensitive, long-context multimodal work, and run your own evaluations before relying on it.