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Balanced — strong quality at a mid priceOpen Weights
GLM 5.1 Pricing
Z.ai · z-ai-glm-5-1
Input / 1M tokens
$0.966
Output / 1M tokens
$3.04
Context window
204,800 tokens
≈ 273 pages of text
Max output
128k tokens
What it costs in practice
Typical request (1,200 in + 400 out tokens)$0.0024
1,000 requests / month$2.37/mo10,000 requests / month$23.74/mo100,000 requests / month$237.36/moEstimate your own workloadOpens the calculator with GLM 5.1 preloaded — adjust volume and token counts there.
Price history
List price per 1M tokens since we started tracking in Jun 2026. Each step marks a price change — hover a point for the exact date and rate.
What it excels at
Supports extended context up to 200k tokens for document and codebase analysis. Open weights enable local deployment and fine-tuning.
The business tradeoff
Smaller ecosystem and tooling compared with major closed providers. Self-hosted deployments introduce variable latency and infrastructure costs.
Head-to-head
Vendor list rates, as of Jul 3, 2026 · source: openrouter · per-request examples assume 1,200 input + 400 output tokens.