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OpenAI: GPT-6 Sol Pro vs Z.ai: GLM 5.3 Prime: API Pricing Compared
Comparing OpenAI: GPT-6 Sol Pro and Z.ai: GLM 5.3 Prime: on combined input+output list price, Z.ai: GLM 5.3 Prime is cheaper at $11.6 vs $12 per 1M tokens — a difference of $0.4 (3%). OpenAI: GPT-6 Sol Pro costs $2 in / $10 out with a 1,050,000-token context; Z.ai: GLM 5.3 Prime costs $2.8 in / $8.8 out with a 1,000,000-token context.
| OpenAI: GPT-6 Sol Pro | Z.ai: GLM 5.3 Prime | |
|---|---|---|
| Input /1M | $2 | $2.8 |
| Output /1M | $10 | $8.8 |
| Cached input /1M | $0.2 | $0.56 |
| Context window | 1,050,000 | 1,000,000 |
| Max output tokens | 128,000 | 131,072 |
| Cost @ 10M in + 2M out / mo | $40 | $45.6 |
Estimate your own workload in the cost calculator, or open the full pages for OpenAI: GPT-6 Sol Pro and Z.ai: GLM 5.3 Prime.
Frequently asked questions
Which is cheaper, OpenAI: GPT-6 Sol Pro or Z.ai: GLM 5.3 Prime?
Z.ai: GLM 5.3 Prime is cheaper on combined list price: $11.6 vs $12 per 1M tokens (input + output). At 10M input + 2M output tokens per month, OpenAI: GPT-6 Sol Pro costs $40 and Z.ai: GLM 5.3 Prime costs $45.6.
Which has the larger context window, OpenAI: GPT-6 Sol Pro or Z.ai: GLM 5.3 Prime?
OpenAI: GPT-6 Sol Pro has a context window of 1,050,000 tokens; Z.ai: GLM 5.3 Prime has 1,000,000 tokens. The larger one is OpenAI: GPT-6 Sol Pro.
Price snapshot October 21, 2026, refreshed daily.