Z.ai (Zhipu) · Released Apr 7, 2026GLM-5.1
Strong GLM coding model for agentic engineering, terminals, and repository generation.
- Capability
- 149.9ECI · #51 of 148
- Input
- $1.40per 1M tokens
- Output
- $4.40per 1M tokens
- Context
- 200K131K max output
What it costs
- Input
- $1.40per million tokens
- Output
- $4.40per million tokens
- Cached input
- $0.26per million tokens
- Blended (3:1)
- $2.15pricier than 72% of priced models
Typical monthly bills
| Monthly usage | Estimated cost |
|---|---|
| Side project2M input + 0.5M output tokens | $5.00 |
| Team assistant25M input + 5M output tokens | $57.00 |
| Production app250M input + 50M output tokens | $570.00 |
Official Z.AI API price, as listed on models.dev.
Independent benchmarks
#51 of 148 scored models
The shaded band is Epoch AI’s confidence range (148.0–151.6); the tick marks the median scored model.
Scores from Epoch AI, run independently of Z.ai (Zhipu).
The details
- Lab
- Z.ai (Zhipu)
- Released
- Apr 7, 2026
- Context window
- 200,000 tokens
- Max output
- 131,072 tokens
- Inputs
- Text
- Output
- Text
- Reasoning
- Can be switched on or off
- Tool calling
- Yes
- Structured output
- Yes
- Weights
- Open weights
- API model ID
glm-5.1on Z.AI- Availability
- 40 API providerslisted on models.dev
What Z.ai (Zhipu) claims
Published by the lab at launch. Settings vary, so compare these only with care.
More from Z.ai (Zhipu)
About GLM-5.1
How much does GLM-5.1 cost?
GLM-5.1 costs $1.40 input / $4.40 output per million tokens (official Z.AI API price). Cached input is $0.26 per million tokens. At a 3:1 input-to-output mix that is $2.15 per million tokens, more expensive than 72% of the 360 priced models we track.
What is the context window of GLM-5.1?
GLM-5.1 accepts up to 200,000 tokens per request and can write up to 131,072 tokens in one response.
How good is GLM-5.1?
Epoch AI gives GLM-5.1 a Capabilities Index score of 149.9 (likely range 148.0–151.6), ranking it #51 of 148 models Epoch has scored. Epoch AI benchmark results: GPQA Diamond 89.9%, FrontierMath Tiers 1–3 36.8%, OTIS Mock AIME 2024–2025 93.3%, SWE-bench Verified 74.2%, SimpleQA Verified 34.0%.
Is GLM-5.1 open source?
Yes. Z.ai (Zhipu) publishes the weights, so it can be downloaded and self-hosted.
What inputs does GLM-5.1 support?
GLM-5.1 accepts text and replies in text. It is a reasoning model, supports tool calling and can return structured JSON output.
When was GLM-5.1 released?
Z.ai (Zhipu) released GLM-5.1 on Apr 7, 2026.
What are the best alternatives to GLM-5.1?
The closest current models from other labs on capability, price and release date are Kimi K2.7 Code (Moonshot AI, ECI 150.0, $0.95 / $4.00), Qwen3.6 Max Preview (Alibaba (Qwen), ECI 149.2, $1.30 / $7.80), Grok 4.3 (xAI, ECI 149.2, $1.25 / $2.50) and GPT-5.4 mini (OpenAI, ECI 148.8, $0.75 / $4.50).