GLM 5.3 vs Us Gov Openai GPT OSS 20 B1.0: cost comparison
Prices updated 2026-11-14 · computed from live provider data
Short answer: Us Gov Openai GPT OSS 20 B1.0 is cheaper on a
3:1 input/output blend — $0.153 per million tokens versus
$0.963, a 84% difference.
GLM 5.3 offers the larger context window at 1,048,576 tokens, against 128,000 for Us Gov Openai GPT OSS 20 B1.0.
Head to head
| GLM 5.3 | Us Gov Openai GPT OSS 20 B1.0 | |
|---|---|---|
| Input, per 1M tokens | $0.084 | $0.084 |
| Output, per 1M tokens | $3.60 | $0.360 |
| Blended 3:1, per 1M | $0.963 | $0.153 |
| Context window | 1,048,576 | 128,000 |
| Vendor | z-ai | us |
Monthly cost at real volumes
| Workload (input / output) | GLM 5.3 | Us Gov Openai GPT OSS 20 B1.0 |
|---|---|---|
| 1M in / 250K out | $0.984 | $0.174 |
| 10M in / 2.5M out | $9.84 | $1.74 |
| 100M in / 25M out | $98.40 | $17.40 |
Which should you pick?
Pick GLM 5.3 when you need the longer context window (1,048,576 vs 128,000 tokens). Pick Us Gov Openai GPT OSS 20 B1.0 when price per token dominates your workload — high-volume classification, extraction, or batch summarisation.