Output tokens cost $3.94 per million on GLM 5.2 and $180.00 per million on GPT 5.4 Pro. Input tokens cost $1.13 per million on GLM 5.2 and $30.00 per million on GPT 5.4 Pro. Cached input tokens are billed at $0.28 per million on GLM 5.2 and $30.00 per million on GPT 5.4 Pro. Context lengths are 1,000,000 tokens on GLM 5.2 and 1,050,000 tokens on GPT 5.4 Pro. Time to first token (TTFT) measured on AIHubMix is 1.1s on GLM 5.2 and 8.6s on GPT 5.4 Pro. Measured output throughput is 38.0 tok/s on GLM 5.2 and 42.0 tok/s on GPT 5.4 Pro.
GLM 5.2
GPT 5.4 ProGLM-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.
Please note: this model is extremely expensive and very slow. If a request fails due to network issues, you may still be charged heavily; we cannot refund charges incurred by requests to this model. GPT-5.4 pro is available in the Responses API only to enable support for multi-turn model interactions before responding to API requests, and other advanced API features in the future. Since GPT-5.4 pro is designed to tackle tough problems, some requests may take several minutes to finish. To avoid timeout, please set a longer timeout duration. It is recommended to use this under good network conditions.
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.
Daily traffic served through AIHubMix — how demand for each model is trending.
Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.
Estimate your monthly bill for the same workload on each model.
Monthly = daily × 30. Discounted rates applied where a promotion is active.
GLM 5.2: $3.94/M output tokens; GPT 5.4 Pro: $180.00/M. Use the cost calculator above to estimate your own workload.
GLM 5.2: 1.1s time to first token measured on AIHubMix; see the live performance charts above for how each model behaves across the day.
GLM 5.2 accepts 1,000,000 and GPT 5.4 Pro accepts 1,050,000 input tokens. Maximum output per request is 128,000 tokens on GLM 5.2 and 128,000 tokens on GPT 5.4 Pro.
GPT 5.4 Pro at 42.0 tok/s and GLM 5.2 at 38.0 tok/s, measured as output throughput on AIHubMix — a separate metric from time to first token.
GLM 5.2 accepts text input and supports thinking, tool calling, function calling and structured outputs; GPT 5.4 Pro accepts text and image input and supports thinking, web search, tool calling, function calling and structured outputs.
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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