# GLM-4.5

GLM-4.5 is an AI model released by Z.ai on Jul 28 2025. It has 355B parameters, a 128k context window and open weight. At release it scored 8% on BullshitBench v2, 79.1% on GPQA Diamond and 64.2% on SWE-Bench Verified.

## Facts

| Field | Value |
| --- | --- |
| Model | GLM-4.5 |
| Developer | Z.ai |
| Release date | Monday, Jul 28 2025 |
| Licensing | Open Weight |
| Parameters | 355B |
| Context window | 128k |

## API pricing

All rates in USD per 1,000,000 tokens, pay-as-you-go.

| Tier | Input | Cached input | Output |
| --- | --- | --- | --- |
| Standard | $0.60 | $0.11 | $2.20 |

Verified August 18, 2026 against the first-party source: https://docs.z.ai/guides/overview/pricing

## Benchmark scores published at release

| Benchmark | Score | What it measures |
| --- | --- | --- |
| BullshitBench v2 | 8% | Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. |
| SWE-Bench Verified | 64.2% | Real coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. |
| GPQA Diamond | 79.1% | Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. |

## About GLM-4.5

GLM-4.5, released July 28, 2025 alongside the lighter GLM-4.5-Air, was Z.ai's entry into the open-weight frontier race: a 355B-parameter mixture-of-experts model designed explicitly for agentic tasks, unifying reasoning, coding, and tool use with switchable thinking modes. It scored 79.1% on GPQA and 64.2% on SWE-Bench Verified.

Released the same month as Kimi K2, it was part of the mid-2025 wave of Chinese open-weight agentic models that reset expectations for what freely downloadable weights could do. Its low-cost API and coding-agent integrations won it a significant developer following outside China, and GLM-4.6 followed nine weeks later.

## Questions and answers

### When was GLM-4.5 released?

GLM-4.5 was released by Z.ai on Monday, Jul 28 2025.

### Who made GLM-4.5?

GLM-4.5 was built by Z.ai. Chinese AI lab spun out of Tsinghua University (formerly Zhipu AI), building the open-weight GLM family. Rebranded internationally as Z.ai in 2025.

### How much does GLM-4.5 cost?

GLM-4.5 costs $0.60 per million input tokens and $2.20 per million output tokens through the Z.ai API. Cached input is $0.11 per million tokens. Rates are pay-as-you-go API prices verified against Z.ai's published pricing on August 18, 2026.

### What benchmark scores did GLM-4.5 get?

GLM-4.5 reports 3 tracked benchmark scores — BullshitBench v2: 8%; SWE-Bench Verified: 64.2%; GPQA Diamond: 79.1%. Scores are the figures published at release by Z.ai.

### What is the context window of GLM-4.5?

GLM-4.5 has a context window of 128k. That is the maximum amount of input plus output the model can hold in a single request.

### How many parameters does GLM-4.5 have?

GLM-4.5 is reported at 355B parameters.

### Is GLM-4.5 open source?

Partly. GLM-4.5 is an open-weight model: the trained weights are free to download and run locally or on your own infrastructure, but the training data and code are not fully released and the license may restrict some commercial uses. It is not open source in the strict sense.

### What came before and after GLM-4.5?

Z.ai's previous tracked release was GLM-4-Plus on Aug 29 2024, 333 days earlier. It was followed by GLM-4.5-Air on Jul 28 2025.


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Canonical page: https://aireleasetracker.com/model/zai/glm-4.5
Full dataset: https://aireleasetracker.com/llms-full.txt · JSON: https://aireleasetracker.com/models.json
Source: AI Release Tracker (https://aireleasetracker.com). Benchmark scores are the figures published by the releasing lab at launch.