GPT-6 Luna Pro vs GLM 5.2: price, context window and capabilities
GPT-6 Luna Pro (openai/gpt-6-luna-pro) is a multimodal language model from OpenAI and GLM 5.2 (z-ai/glm-5.2) a language model from Z.ai; both are on the OceanToken API. GPT-6 Luna Pro costs less per token than GLM 5.2: $0.10 against $1.19 per 1M input tokens (92% less) and $0.50 against $3.74 per 1M output tokens (87% less). Their context windows are almost the same size, about 1.05M tokens: GPT-6 Luna Pro takes 1,050,000 tokens and GLM 5.2 1,048,576. Both support tool calling, reasoning and structured outputs; only GPT-6 Luna Pro also lists image input and file input.
Side by side
| Spec | GPT-6 Luna Pro | GLM 5.2 −35% |
|---|---|---|
| Model | GPT-6 Luna Proopenai/ | GLM 5.2z- |
| Publisher | OpenAI | Z.ai |
| Kind | Text & vision | Text |
| Context window | 1.05M tokens1,050,000 | 1.05M tokens1,048,576 |
| Input price | $0.10 / 1M tokens | $1.19 / 1M tokens |
| Output price | $0.50 / 1M tokens | $3.74 / 1M tokens |
| Cached input price | $0.01 / 1M tokens | $0.26 / 1M tokens |
| Cache write price | $0.125 / 1M tokens | – |
| Web search price | $0.01 / search | – |
| Discount (vs official, top tier) | — | −35% |
| Inputs | text, images and files | text |
| Outputs | text | text |
| Tool calling | Yes | Yes |
| Reasoning | Yes | Yes |
| Structured outputs | Yes | Yes |
About these prices
Which should you choose?
- Choose GPT-6 Luna Pro to spend less per token: 92% less for input and 87% less for output than GLM 5.2.
- Context size does not separate them: both hold about 1.05M tokens.
- Choose GPT-6 Luna Pro if you need image input and file input: GLM 5.2 does not list them.
- Not sure? Call both with the same OceanToken API key and compare them on your own prompts; each request is billed per use from one prepaid balance.
Get API Key GPT-6 Luna Pro GLM 5.2
Frequently asked questions
Which is cheaper, GPT-6 Luna Pro or GLM 5.2?
GPT-6 Luna Pro. GPT-6 Luna Pro costs less per token than GLM 5.2: $0.10 against $1.19 per 1M input tokens (92% less) and $0.50 against $3.74 per 1M output tokens (87% less). These are OceanToken starting prices per use; the OceanToken console always shows the current price.
Which has the larger context window, GPT-6 Luna Pro or GLM 5.2?
GPT-6 Luna Pro, by 1,424 tokens. Their context windows are almost the same size, about 1.05M tokens: GPT-6 Luna Pro takes 1,050,000 tokens and GLM 5.2 1,048,576.
Can I call both GPT-6 Luna Pro and GLM 5.2 with one API key?
Yes. Both are on the OceanToken API at https://api.oceantoken.ai/v1: one API key and one prepaid balance call either model. Send the model id openai/gpt-6-luna-pro or z-ai/glm-5.2.
Models and publishers
GPT-6 Luna Pro · GLM 5.2 · All OpenAI models · All Z.ai models
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