Gemini 3.8 Flash vs GLM-5.2
How Google AI's Gemini 3.8 Flash 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
- Gemini 3.8 Flash accepts a larger context window: 1.05M tokens versus 1M for GLM-5.2.
- GLM-5.2 can write longer replies, up to 128K output tokens against 66K.
- Gemini 3.8 Flash is the newer release (September 2026); GLM-5.2 came out in July 2026.
- Gemini 3.8 Flash lists image input support that GLM-5.2 does not.
- GLM-5.2 lists extended thinking support that Gemini 3.8 Flash does not.
Side by side
| Spec | Gemini 3.8 Flash | GLM-5.2 |
|---|---|---|
| Provider | Google AI | Z.AI (GLM) |
| Released | September 2026 | July 2026 |
| Context window | 1.05M tokens | 1M tokens |
| Max output | 66K 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, 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 Gemini 3.8 Flash and GLM-5.2's answers side by side, with response time, tokens and cost for each. You'll need Google AI and Z.AI (GLM) keys.
Open Gemini 3.8 Flash vs GLM-5.2