As of August 20, 2026, GLM-4.5-Air is 100% cheaper per million tokens than o1-pro. GLM-4.5-Air is $0.20 / $1.10 per million input/output tokens versus o1-pro at $150.00 / $600.00. Sources: https://docs.z.ai/guides/overview/pricing and https://developers.openai.com/api/docs/pricing
Sources: Z AI pricing (https://docs.z.ai/guides/overview/pricing); OpenAI API pricing (https://developers.openai.com/api/docs/pricing)
GLM-4.5-Air
Z AI
Input
$0.20
Output
$1.10
o1-pro
OpenAI
Input
$150.00
Output
$600.00
Token pricing, specs, and benchmarks side by side
GLM-4.5-Airo1-proVerdict
GLM-4.5-Air offers both lower pricing and stronger benchmark performance across the board, making it the clear value leader in this comparison.
As of August 20, 2026, GLM-4.5-Air is 100% cheaper on blended LLM API pricing. GLM-4.5-Air costs $0.20 per million input tokens and $1.10 per million output tokens ($1.30 blended 1M-in + 1M-out). o1-pro costs $150.00 / $600.00 per million tokens ($750.00 blended). Sources: https://docs.z.ai/guides/overview/pricing and https://developers.openai.com/api/docs/pricing. The cheapest LLM for your app still depends on how many output tokens you generate.
GLM-4.5-Air Z AI API pricing is $0.20 input and $1.10 output per million tokens via Z AI. o1-pro OpenAI API pricing is $150.00 input and $600.00 output per million tokens via OpenAI. Use those four numbers, not ChatGPT Plus or Claude Pro subscription prices, when you are comparing APIs.
GLM-4.5-Air has a published SWE-bench Verified score of 57.6%. o1-pro does not have that eval on this page yet.
GLM-4.5-Air supports a 131K token context window, while o1-pro supports 200K tokens. o1-pro offers a larger context window. Filling a larger window bills more input tokens, so the cheaper-per-million model can still cost more on long documents.
GLM-4.5-Air leads on 2 of 3 shared benchmarks versus o1-pro's 1 wins. Check the comparison table for GPQA Diamond, SWE-bench, MMLU, HLE, and the other evals we track. Token price and benchmark score together are the usual LLM comparison, not either number alone.
Both GLM-4.5-Air and o1-pro are production API models. For cost-sensitive production traffic, GLM-4.5-Air has better economics on the blended 1M-in + 1M-out scale. For maximum capability, weight the benchmark table for your domain. Many production stacks route cheap models for drafts and a frontier model for the hard turn, which is usually cheaper than sending everything to the expensive API.
Yes. Call GLM-4.5-Air through Z AI and o1-pro through OpenAI with separate API keys, or through a gateway that already wraps both. Keep prompts in tokens, not characters, when you estimate the invoice. AnotherWrapper templates can swap providers without rewriting auth and billing.
List rates are the latest published Z AI API pricing and OpenAI API pricing, quoted per million tokens. Official rate sheets: https://docs.z.ai/guides/overview/pricing and https://developers.openai.com/api/docs/pricing. Prompt caching, batch APIs, and committed-use discounts can change the invoice. Benchmark scores are from official publications and independent evals, updated as new numbers land.
GLM-4.5-Air supports up to an unspecified number of output tokens per request, while o1-pro supports up to 100K output tokens. Output tokens are usually the expensive half of API pricing, so a higher max output cap is a capability, not a discount.
Neither GLM-4.5-Air nor o1-pro has published throughput data on this page yet. Throughput (tokens per second) and time-to-first-token are why two models with the same per-million-token price can still feel different in chat and agents.
Use the model pickers at the top of this LLM comparison. Search any model in the index and the URL updates. Open GLM-4.5-Air or o1-pro from the sidebar for the single-model API pricing page, or go back to the LLM pricing table to sort by cheapest blended cost.
This comparison covers API pricing, context window, throughput, and benchmark scores. GLM-4.5-Air costs $0.20/M input and $1.10/M output. o1-pro costs $150.00/M input and $600.00/M output.
Rank both on the LLM leaderboard, SWE-bench, and Humanity's Last Exam.
The index
280 models across 33 providers. Search or jump to a lab — every model page stays linked here.
Next step
Auth, billing, and the API layer are already decided. Fork 8 finished AI apps, or have us build the first version with you.
