GLM-5.3-FlashX vs GPT-5 Mini
Price and specs side by side · USD per 1M tokens · verified 2026-10-23
// side by side
| metric | GLM-5.3-FlashX | GPT-5 Mini |
|---|---|---|
| input / 1M | $0.37 | $0.25 |
| output / 1M | $1.25 | $2.00 |
| blended (3:1) | $0.59 | $0.6875 |
| cache read / 1M | $0.075 | $0.025 |
| context | 1M | 400K |
| max output | 131.1K | 128K |
| input types | text · image · video · pdf | text · image |
| reasoning | yes | yes |
| tool calling | yes | yes |
| structured output | yes | yes |
| open weights | yes | no |
| released | 2026-09-18 | 2025-08-07 |
| knowledge cutoff | n/a | 2024-05-30 |
| lab | Z.AI (Zhipu) | OpenAI |
// monthly cost scenarios
| workload | tokens in / out | GLM-5.3-FlashX | GPT-5 Mini |
|---|---|---|---|
| Chatbot | 10M / 2M | $6.20 | $6.50 |
| RAG app | 50M / 5M | $24.75 | $22.50 |
| Coding agent | 20M / 10M | $19.90 | $25.00 |
// verdict
- GLM-5.3-FlashX is 14.2% cheaper than GPT-5 Mini on a blended 3:1 input/output basis.
- GLM-5.3-FlashX has the larger context window (1M vs 400K tokens).
- Chatbot (10M input / 2M output tokens per month): GLM-5.3-FlashX costs $6.20 vs $6.50 for GPT-5 Mini, saving $0.30 per month.
- RAG app (50M input / 5M output tokens per month): GPT-5 Mini costs $22.50 vs $24.75 for GLM-5.3-FlashX, saving $2.25 per month.
- Coding agent (20M input / 10M output tokens per month): GLM-5.3-FlashX costs $19.90 vs $25.00 for GPT-5 Mini, saving $5.10 per month.
// GLM-5.3-FlashX or GPT-5 Mini: which one to choose
- Choose GLM-5.3-FlashX for cost-sensitive, high-volume workloads.
- Choose GLM-5.3-FlashX for long documents and large codebases (1M-token context).
- Choose GLM-5.3-FlashX if you want open weights you can self-host.