// Zhipu (Z.ai)
GLM-5.1
A Zhipu (Z.ai) model. 9 prices across 8 channels side by side, each with its source and check date – plus specs, licence, speed and benchmarks.
- Official in/out per 1M
- ¥6 / ¥24
- Lowest (Chutes)
- $0.98 / $3.08
- Context
- 205K
- AA index
- 26.1
Prices checked 2026-10-22Official sources linked on every rowNo estimates
01Specs at a glance
Official values first; gaps filled from OpenRouter’s API where the vendor page is silent.
| Vendor | Zhipu (Z.ai) |
|---|---|
| Context window | 205K (204,800 tokens) |
| Max output | 128K |
| Input | Text |
| Output | Text |
| Tool calling / JSON | Yes / Yes |
| Weights & licence | Open weights · MIT · Hugging Face |
| Parameters | 754B (from weight files) |
| Released | Apr 7, 2026 |
| Model IDs | glm-5.1 · z-ai/glm-5.1 · Pro/zai-org/GLM-5.1 |
02Prices on 8 channels
Per 1M tokens, in the currency each source publishes (1 USD = 6.7 CNY for the blended column). Sorted: official first, then cheapest.
| Channel | Source | Input | Output | Cache hit | Blended $ | Context | Notes |
|---|---|---|---|---|---|---|---|
| Official Vendor’s China site, billed in CNY | Official 10-10 | ¥6 | ¥24 | — | 1.57 | 205K | Batch −50%prompt>=32K: 8/28 Batch -50%; <32K tier; >=32K 8/28 |
| Chutes · fp8 Via OpenRouter / provider listed there | OpenRouter 10-22 | $0.98 | $3.08 | $0.098 | 1.5 | 203K | Chutes price as listed on OpenRouter (pass-through; quantization=fp8; discount field=0); not checked against Chutes's own page |
| SiliconFlow Inference platform (own price page) | Platform 10-10 | ¥6 | ¥24 | ¥1.3 | 1.57 | — | 输入 [32k, +∞): 8/28 SiliconFlow (硅基流动) own pricing page; tiered by input length, first tier shown |
| SiliconFlow · fp8 Via OpenRouter / provider listed there | OpenRouter 10-22 | $1.19 | $3.74 | $0.6 | 1.83 | 205K | SiliconFlow price as listed on OpenRouter (pass-through; quantization=fp8; discount field=0); not checked against SiliconFlow's own page |
| AtlasCloud · fp8 Via OpenRouter / provider listed there | OpenRouter 10-22 | $1.26 | $3.96 | $0.234 | 1.94 | 203K | AtlasCloud price as listed on OpenRouter (pass-through; quantization=fp8; discount field=0); not checked against AtlasCloud's own page |
| Novita · fp8 Via OpenRouter / provider listed there | OpenRouter 10-22 | $1.38 | $4.4 | $0.26 | 2.13 | 205K | Novita price as listed on OpenRouter (pass-through; quantization=fp8; discount field=0); not checked against Novita's own page |
| Nebius · fp8 Via OpenRouter / provider listed there | OpenRouter 10-22 | $1.4 | $4.4 | — | 2.15 | 203K | Nebius price as listed on OpenRouter (pass-through; quantization=fp8; discount field=0); not checked against Nebius's own page |
| GMICloud · fp8 Via OpenRouter / provider listed there | OpenRouter 10-22 | $1.4 | $4.4 | $0.26 | 2.15 | 203K | GMICloud price as listed on OpenRouter (pass-through; quantization=fp8; discount field=0); not checked against GMICloud's own page |
| Friendli · unknown Via OpenRouter / provider listed there | OpenRouter 10-22 | $1.4 | $4.4 | $0.26 | 2.15 | 203K | Friendli price as listed on OpenRouter (pass-through; quantization=unknown; discount field=0); not checked against Friendli's own page |
“Official” = vendor pricing page; “Platform” = the platform’s own pricing page; “OpenRouter” = price listed on OpenRouter, not checked on the platform’s site. Click a source tag to open the original page.
03Where you can use it
Derived only from the price sources above. Country restrictions are set by each vendor – check their terms before you sign up.
- Vendor’s China site, billed in CNY
Official - Via OpenRouter / provider listed there
Chutes · SiliconFlow · AtlasCloud · Novita · Nebius · GMICloud · Friendli - Inference platform (own price page)
SiliconFlow - Self-host the open weights
GPU / VRAM sizing and build plans→
04Performance
All results →Speed and AA index from Artificial Analysis public leaderboards (not our own tests); benchmark scores from our benchmark library, best result per benchmark.
- AA indexGLM-5.1 (Reasoning)
- 26.1
- Output speed (median)
- 55 tok/s
- Time to first token
- 1.7s
- AA index per $ (blended)
- 16.63
| Benchmark | Best score | Source | Date |
|---|---|---|---|
| LMArena Text | 1464 | official | 2026-10-08 |
| LMArena WebDev | 1508 | official | 2026-10-08 |
| GPQA Diamond | 89.9% | independent | 2026-08-10 |
| SWE-bench Verified | 74.2% | independent | 2026-05-15 |
| AIME (OTIS Mock AIME 2024–2025) | 93.3% | independent | 2026-08-10 |
05Price changes we recorded
All price changes →From our daily re-checks of the sources above.
No price change recorded since we started tracking (2026-10-10).
06More from Zhipu (Z.ai)
FAQ
How much does the GLM-5.1 API cost?
On the official pricing page: ¥6 / ¥24 per 1M input / output tokens (checked 2026-10-10). The lowest price we found is $0.98 / $3.08 on Chutes.
What is the context window of GLM-5.1?
205K tokens of context, up to 128K output tokens. Platforms may cap it lower – see the table.
Is GLM-5.1 open source?
Yes, the weights are published on Hugging Face (zai-org/GLM-5.1). Licence: MIT.