DeepSeek V4 Flash vs GLM-5.3-Flash: API pricing and features
DeepSeek V4 Flash vs GLM-5.3-Flash on BigModel.io: price, context, inputs and Claude Code support. DeepSeek V4 Flash $0.09 / $0.18, GLM-5.3-Flash $0.15 / $0.50 per 1M input / output tokens.
In short
- DeepSeek V4 Flash is cheaper: a typical coding-agent request (20K in, 2K out) costs about $0.0022, against $0.004 on GLM-5.3-Flash, which costs about 1.9 times as much.
- Only DeepSeek V4 Flash works in Claude Code; use the other in OpenCode, Cline, Cursor or another OpenAI-compatible tool.
- Only GLM-5.3-Flash accepts image input.
Prices are what BigModel.io charges today, in US dollars. Quality depends on your task: try both on the same prompt before you switch.
Side by side
| DeepSeek V4 Flash | GLM-5.3-Flash | |
|---|---|---|
| Model ID | deepseek-v4-flash | glm-5.3-flash |
| Developer | DeepSeek | GLM |
| Input / 1M tokens | $0.09 | $0.15 |
| Output / 1M tokens | $0.18 | $0.50 |
| Cached input / 1M | $0.03 | $0.0339 |
| Below official price | 70% | — |
| Agent request (20K in, 2K out) | $0.0022 | $0.004 |
| Context window | 1M | 1M |
| Inputs | Text | Text, Image, Video |
| Claude Code (/v1/messages) | Yes | No |
| Chat Completions | Yes | Yes |
Switch between them
Both use the same key and base URL. Change only the model field:
client.chat.completions.create(model="deepseek-v4-flash", ...) # or "glm-5.3-flash"To fall back automatically when one is unavailable, send both in models: "models": ["deepseek-v4-flash", "glm-5.3-flash"] Fallback →