GLM-5.1 vs DeepSeek V4 Pro — LLM API Cost Comparison
Compare GLM-5.1 (Zhipu AI (GLM)) vs DeepSeek V4 Pro (DeepSeek) on cost per million tokens, context window, and monthly spend.
Prices verified 2026-05-23 · Pricing may change — use the calculator for current estimates
- Input
- $1.4/1M tokens
- Output
- $4.4/1M tokens
- Context
- 205K tokens
- Released
- 2026-03
Latest GLM flagship; improved reasoning over GLM-5
- Input
- $1.74/1M tokens
- Output
- $3.48/1M tokens
- Context
- 1M tokens
- Released
- 2026-03
DeepSeek flagship; 1M context; promo 75% off ($0.435/$0.87) until May 31 2026
Monthly Cost by Usage Tier (70% input / 30% output ratio)
| Usage | GLM-5.1 | DeepSeek V4 Pro | Cheaper by |
|---|---|---|---|
| Light (1M tokens) | $2.30 | $2.26 | DeepSeek V4 Pro (2%) |
| Moderate (10M tokens) | $23.00 | $22.62 | DeepSeek V4 Pro (2%) |
| Heavy (100M tokens) | $230 | $226 | DeepSeek V4 Pro (2%) |
| Very Heavy (1B tokens) | $2,300 | $2,262 | DeepSeek V4 Pro (2%) |
Frequently Asked Questions
Which is cheaper — GLM-5.1 or DeepSeek V4 Pro?
For input tokens, GLM-5.1 is cheaper at $1.4/1M tokens — 1.2× less than $1.74/1M. For output tokens, DeepSeek V4 Pro wins at $3.48/1M vs $4.4/1M. At heavy workloads (100M tokens/month), the cost difference can be significant.
What is the context window difference between GLM-5.1 and DeepSeek V4 Pro?
GLM-5.1 supports 204,800 tokens per request; DeepSeek V4 Pro supports 1,000,000 tokens. DeepSeek V4 Pro wins on context length, making it better for long documents, large codebases, or extended conversations without chunking.
When should I choose GLM-5.1 over DeepSeek V4 Pro?
Choose GLM-5.1 (Zhipu AI (GLM)) if you prefer Zhipu AI (GLM)'s ecosystem, tooling, or reliability track record. Latest GLM flagship; improved reasoning over GLM-5. Choose DeepSeek V4 Pro (DeepSeek) if DeepSeek flagship; 1M context; promo 75% off ($0.435/$0.87) until May 31 2026. the price/performance fits your workload better. Use this calculator to find the break-even point for your exact token volume.
How much does 1 billion tokens cost on GLM-5.1 vs DeepSeek V4 Pro?
At 700M input + 300M output tokens (1B total): GLM-5.1 costs $2300; DeepSeek V4 Pro costs $2262. The difference is $38/billion tokens at this 70/30 input/output ratio.