OpenAI: GPT-5.1 vs Z.ai: GLM 4.6
Z.ai: GLM 4.6 is cheaper than OpenAI: GPT-5.1 by about 71% on a blended (75% input / 25% output) basis. OpenAI: GPT-5.1 charges $1.250000 / $10.000000 per 1M input/output tokens; Z.ai: GLM 4.6 charges $0.600000 / $2.200000.
| Field | OpenAI: GPT-5.1 | Z.ai: GLM 4.6 |
|---|---|---|
| Input $/Mtok | $1.250000 | $0.600000 |
| Output $/Mtok | $10.000000 | $2.200000 |
| Cache read $/Mtok | $0.125000 | $0.110000 |
| Cache write $/Mtok | – | – |
| Input $/Mchar | 0.352142 | n/a |
| Output $/Mchar | 2.817139 | n/a |
| Context window | 400000 | 202752 |
| Tokenizer | o200k | – |
Price history
Same workload, monthly cost
Illustrative monthly cost at 10M tokens/month, split per workload preset. Not a substitute for the calculator, which uses your own volume, cache and batch assumptions.
| Workload | OpenAI: GPT-5.1 | Z.ai: GLM 4.6 |
|---|---|---|
| Coding agent | $16.88 | $6.80 |
| RAG chat | $25.63 | $8.40 |
| Summarisation (batch) | $21.25 | $7.60 |
| Classification | $14.25 | $6.32 |
| Chat assistant | $47.50 | $12.40 |
| Content generation | $82.50 | $18.80 |
Cite this page
OpenAI: GPT-5.1 vs Z.ai: GLM 4.6: $1.250000/$10.000000 vs $0.600000/$2.200000 per 1M tokens, as of 2026-10-04 (Token Barometer, https://tokenbarometer.com/compare/openai_gpt-5.1-vs-zhipu_glm-4.6).
OpenAI: GPT-5.1 page | Z.ai: GLM 4.6 page | Open in calculator