GLM 5.1 API Pricing
Zhipu · Mid-tier · Apache 2.0 · released 2026-04. Prices in USD per 1 million tokens. Data snapshot: 2026-08-14.
- Input: $1.40 per 1M tokens
- Output: $4.40 per 1M tokens
- Batch API (input/output): not published
- Prompt-cache read: $0.26
- Context window: 205K
- Arena ELO: 1420 (as of 2026-08-13)
- Available on: Direct API, OpenRouter (curated by hand — verify with the provider)
Cost per request by business use case
List price vs optimized (prompt caching on the cached input share, batch API for async workloads — only where the provider publishes those rates).
| Use case | Tokens (in/out) | Cost/req (list) | Cost/req (optimized) | Monthly @100K req |
|---|---|---|---|---|
| Support Ticket | 1,500 / 500 | $0.0043 | $0.0033 | $327 |
| Knowledge Q&A | 2,000 / 800 | $0.0063 | $0.0047 | $472 |
| Meeting Summary | 10,000 / 1,200 | $0.019 | $0.018 | $1.8K |
| Marketing Content | 2,500 / 1,800 | $0.011 | $0.011 | $1.1K |
| Coding Task | 3,000 / 2,000 | $0.013 | $0.011 | $1.1K |
| Invoice Processing | 1,500 / 600 | $0.0047 | $0.0042 | $423 |
| Call Summary | 2,000 / 700 | $0.0059 | $0.0057 | $565 |
| Agent Workflow | 6,000 / 3,000 | $0.022 | $0.017 | $1.7K |
These are list prices — real cost also depends on caching, batching, negotiated discounts, marketplace agreements, and existing contracts. Get a FinOps review from OptimNow or compare all models.