GLM 5.3 vs GPT-6.1 Terra: price, context window and capabilities
GLM 5.3 (z-ai/glm-5.3) is a language model from Z.ai and GPT-6.1 Terra (openai/gpt-6.1-terra) a multimodal language model from OpenAI; both are on the OceanToken API. GLM 5.3 costs less for output: $3.74 against $4.50 per 1M output tokens (17% less); GPT-6.1 Terra costs less for input: $0.90 against $1.19 per 1M input tokens (24% less). GPT-6.1 Terra is 10% off its official price on OceanToken, for every account. Their context windows are almost the same size, about 1.05M tokens: GPT-6.1 Terra takes 1,050,000 tokens and GLM 5.3 1,048,576. Both support tool calling, reasoning and structured outputs; only GPT-6.1 Terra also lists image input and file input.
Side by side
| Spec | GLM 5.3 −25% | GPT-6.1 Terra −10% |
|---|---|---|
| Model | GLM 5.3z- | GPT-6.1 Terraopenai/ |
| Publisher | Z.ai | OpenAI |
| Kind | Text | Text & vision |
| Context window | 1.05M tokens1,048,576 | 1.05M tokens1,050,000 |
| Input price | $1.19 / 1M tokens | $0.90 / 1M tokens |
| Output price | $3.74 / 1M tokens | $4.50 / 1M tokens |
| Cached input price | $0.26 / 1M tokens | $0.05 / 1M tokens |
| Cache write price | – | $1.25 / 1M tokens |
| Web search price | – | $0.01 / search |
| Discount (vs official, top tier) | −25% | −10% |
| Inputs | text | text, images and files |
| Outputs | text | text |
| Tool calling | Yes | Yes |
| Reasoning | Yes | Yes |
| Structured outputs | Yes | Yes |
About these prices
Which should you choose?
- Price depends on the mix: GLM 5.3 costs less for output and GPT-6.1 Terra for input, so estimate both on your own volume of input tokens and output tokens.
- Context size does not separate them: both hold about 1.05M tokens.
- Choose GPT-6.1 Terra if you need image input and file input: GLM 5.3 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 GLM 5.3 GPT-6.1 Terra
Frequently asked questions
Which is cheaper, GLM 5.3 or GPT-6.1 Terra?
It depends on the mix of tokens. GLM 5.3 costs less for output: $3.74 against $4.50 per 1M output tokens (17% less); GPT-6.1 Terra costs less for input: $0.90 against $1.19 per 1M input tokens (24% less). GPT-6.1 Terra is 10% off its official price on OceanToken, for every account. The OceanToken console always shows the current price.
Which has the larger context window, GLM 5.3 or GPT-6.1 Terra?
GPT-6.1 Terra, by 1,424 tokens. Their context windows are almost the same size, about 1.05M tokens: GPT-6.1 Terra takes 1,050,000 tokens and GLM 5.3 1,048,576.
Can I call both GLM 5.3 and GPT-6.1 Terra 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 z-ai/glm-5.3 or openai/gpt-6.1-terra.
Models and publishers
GLM 5.3 · GPT-6.1 Terra · All Z.ai models · All OpenAI models
More comparisons
GLM 5.3 vs DeepSeek V4 Pro · GLM 5.3 vs Kimi K3 · DeepSeek V4.1 Flash vs GPT-6.1 Terra · DeepSeek V4 Pro vs GPT-6.1 Terra · All comparisons