GLM-5.2 is Z.ai’s flagship model for the era of long-horizon tasks. With a truly usable 1M-token context window, it can handle project-level engineering context, execute long-running tasks more reliably, follow engineering standards more consistently, and complete the full development workflow from requirements to multi-platform deployment in a single task.
GLM 5.2 vs GPT 4o Mini Search Preview
Output tokens cost $3.94 per million on GLM 5.2 and $0.60 per million on GPT 4o Mini Search Preview. Input tokens cost $1.13 per million on GLM 5.2 and $0.15 per million on GPT 4o Mini Search Preview. Cached input tokens are billed at $0.28 per million on GLM 5.2 and $0.08 per million on GPT 4o Mini Search Preview. Context lengths are 1,000,000 tokens on GLM 5.2 and 128,000 tokens on GPT 4o Mini Search Preview. Time to first token (TTFT) measured on AIHubMix is 1.2s on GLM 5.2 and 1.6s on GPT 4o Mini Search Preview. Measured output throughput is 41.4 tok/s on GLM 5.2 and 189.0 tok/s on GPT 4o Mini Search Preview.
GLM 5.2Using the Chat Completions API, you can directly access the fine-tuned models and tool used by Search in ChatGPT. When using Chat Completions, the model always retrieves information from the web before responding to your query. To use web_search_preview as a tool that models like gpt-4o and gpt-4o-mini invoke only when necessary, switch to using the Responses API. Currently, you need to use one of these models to use web search in Chat Completions: gpt-4o-search-preview gpt-4o-mini-search-preview Web search parameter example import OpenAI from "openai"; const client = new OpenAI(); const completion = await client.chat.completions.create({ model: "gpt-4o-search-preview", web_search_options: {}, messages: [{ "role": "user", "content": "What was a positive news story from today?" }], }); console.log(completion.choices[0].message.content); Output and citations The API response item in the choices array will include: message.content with the text result from the model, inclusive of any inline citations annotations with a list of cited URLs By default, the model's response will include inline citations for URLs found in the web search results. In addition to this, the url_citation annotation object will contain the URL and title of the cited source, as well as the start and end index characters in the model's response where those sources were used.
Pricing & Specifications
Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.
Promotional prices show the discounted rate; see each model page for promotion windows.
Activity Past 30 Days
Daily traffic served through AIHubMix — how demand for each model is trending.
Tokens / day
Requests / day
Performance Past 3 Days
Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.
Throughput (tok/s)
TTFT (s)
Uptime (%)
Cost calculator
Estimate your monthly bill for the same workload on each model.
Monthly = daily × 30. Discounted rates applied where a promotion is active.
FAQ
Which is cheaper: GLM 5.2, GPT 4o Mini Search Preview?
GPT 4o Mini Search Preview: $0.60/M output tokens; GLM 5.2: $3.94/M. Use the cost calculator above to estimate your own workload.
Which responds faster?
GLM 5.2: 1.2s time to first token measured on AIHubMix; see the live performance charts above for how each model behaves across the day.
How large is each context window?
GLM 5.2 accepts 1,000,000 and GPT 4o Mini Search Preview accepts 128,000 input tokens. Maximum output per request is 128,000 tokens on GLM 5.2 and 16,384 tokens on GPT 4o Mini Search Preview.
Which one generates tokens faster?
GPT 4o Mini Search Preview at 189.0 tok/s and GLM 5.2 at 41.4 tok/s, measured as output throughput on AIHubMix — a separate metric from time to first token.
What inputs and capabilities does each model support?
GLM 5.2 accepts text input and supports thinking, tool calling, function calling and structured outputs; GPT 4o Mini Search Preview accepts text and image input and supports web search, function calling and structured outputs.
Can I call GLM 5.2 and GPT 4o Mini Search Preview with the same API key?
Yes. AIHubMix serves every model on this page behind one OpenAI-compatible endpoint, so switching between them is a one-line change to the model field — no second account, key or SDK.
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