GLM 5.3 Flash: price, context window and capabilities
GLM 5.3 Flash is a model from Z.ai (z-ai/glm-5.3-flash). It supports reasoning. It supports tool use. It costs $0.150 per million input tokens and $0.500 per million output tokens, with a 1.0M-token context window.
What it costs in practice
Using the listed prices: a chat turn of 2,000 input and 500 output tokens costs about $0.0006, so 10,000 such turns cost about $5.50. Summarising a 100,000-token document into 2,000 tokens costs about $0.016. A long agent run that reads 1 million tokens and writes 50,000 costs about $0.175.
How it compares
Among the 40 models we track, GLM 5.3 Flash ranks #7 by input price and #7 by output price (1 is cheapest), and #6 by context window (1 is largest). Models with the same tool and reasoning support that cost less per output token: DeepSeek V4 Pro 0423 ($0.418), Qwen3.8 Omni Flash ($0.470), Qwen3.8 Flash ($0.470). Models with a larger context window at the same or lower output price: Llama 4 Scout (1.3M), GPT-6 Luna Pro (1.1M), GPT-6 Luna (1.1M).
More from Z.ai
- GLM 5.3 Prime: $2.80 in / $8.80 out, 1M context
- GLM 5.3 FlashX: $0.370 in / $1.25 out, 1.0M context
- GLM 5.3: $1.40 in / $4.40 out, 1.0M context
Prices and limits come from OpenRouter's public model catalogue, last synced 4 Oct 2026. Provider pricing can differ from OpenRouter's and changes often; confirm on the provider's own page before you commit. See the guide to choosing a model or the full comparison.
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