GPT-6.1 Terra vs GLM-5.2
How OpenAI's GPT-6.1 Terra and Z.AI (GLM)'s GLM-5.2 differ on paper, from the specs each provider publishes.
Compare them on your promptBoth answer side by side, free with your own API keys.
Key differences
- GPT-6.1 Terra accepts a larger context window: 1.05M tokens versus 1M for GLM-5.2.
- GPT-6.1 Terra is the newer release (October 2026); GLM-5.2 came out in July 2026.
- GPT-6.1 Terra lists image input support that GLM-5.2 does not.
Side by side
| Spec | GPT-6.1 Terra | GLM-5.2 |
|---|---|---|
| Provider | OpenAI | Z.AI (GLM) |
| Released | October 2026 | July 2026 |
| Context window | 1.05M tokens | 1M tokens |
| Max output | 128K tokens | 128K tokens |
| Reasoning model | Yes | Yes |
| Price per 1M tokens (in / out) | See provider | See provider |
| Capabilities | Image input, Reasoning, Coding, Tool calling, Structured output, Extended thinking, Streaming | Reasoning, Coding, Tool calling, Structured output, Extended thinking, Streaming |
Specs as published by each provider. Benchmarks and output quality aren't covered here; the best test is your own prompts.
Specs only go so far. Ask both.
Send one message and get GPT-6.1 Terra and GLM-5.2's answers side by side, with response time, tokens and cost for each. You'll need OpenAI and Z.AI (GLM) keys.
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