GLM 5.3 FlashX vs GPT-6 Sol: price, context window and capabilities
GLM 5.3 FlashX (z-ai/glm-5.3-flashx) from Z.ai and GPT-6 Sol (openai/gpt-6-sol) from OpenAI are both multimodal language models on the OceanToken API. GLM 5.3 FlashX costs less per token than GPT-6 Sol: $0.37 against $1.80 per 1M input tokens (79% less) and $1.25 against $9.00 per 1M output tokens (86% less). GPT-6 Sol 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 Sol takes 1,050,000 tokens and GLM 5.3 FlashX 1,048,576. Both support tool calling, reasoning and image input; only GLM 5.3 FlashX also lists video input; only GPT-6 Sol also lists structured outputs and file input.
Side by side
| Spec | GLM 5.3 FlashX | GPT-6 Sol −10% |
|---|---|---|
| Model | GLM 5.3 FlashXz- | GPT-6 Solopenai/ |
| Publisher | Z.ai | OpenAI |
| Kind | Text, vision & video | Text & vision |
| Context window | 1.05M tokens1,048,576 | 1.05M tokens1,050,000 |
| Input price | $0.37 / 1M tokens | $1.80 / 1M tokens |
| Output price | $1.25 / 1M tokens | $9.00 / 1M tokens |
| Cached input price | $0.09 / 1M tokens | $0.20 / 1M tokens |
| Cache write price | – | $2.50 / 1M tokens |
| Web search price | – | $0.01 / search |
| Discount (vs official, top tier) | — | −10% |
| Inputs | text, images and video | text, images and files |
| Outputs | text | text |
| Tool calling | Yes | Yes |
| Reasoning | Yes | Yes |
| Structured outputs | Not listed | Yes |
About these prices
Which should you choose?
- Choose GLM 5.3 FlashX to spend less per token: 79% less for input and 86% less for output than GPT-6 Sol.
- Context size does not separate them: both hold about 1.05M tokens.
- Choose GLM 5.3 FlashX if you need video input: GPT-6 Sol does not list it.
- 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 FlashX GPT-6 Sol
Frequently asked questions
Which is cheaper, GLM 5.3 FlashX or GPT-6 Sol?
GLM 5.3 FlashX. GLM 5.3 FlashX costs less per token than GPT-6 Sol: $0.37 against $1.80 per 1M input tokens (79% less) and $1.25 against $9.00 per 1M output tokens (86% less). GPT-6 Sol 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 FlashX or GPT-6 Sol?
GPT-6 Sol, by 1,424 tokens. Their context windows are almost the same size, about 1.05M tokens: GPT-6 Sol takes 1,050,000 tokens and GLM 5.3 FlashX 1,048,576.
Can I call both GLM 5.3 FlashX and GPT-6 Sol 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-flashx or openai/gpt-6-sol.
Models and publishers
GLM 5.3 FlashX · GPT-6 Sol · All Z.ai models · All OpenAI models
More comparisons
DeepSeek V4 Pro vs GPT-6 Sol · Claude Sonnet 5.5 vs GPT-6 Sol · Gemini 3.1 Pro Preview vs GPT-6 Sol · Grok 4.6 vs GPT-6 Sol · All comparisons