llmgauge

Z.AI · model

GLM 5.1

$0.98/1M in · $3.08/1M out · 203K context. That's cheaper than 32% of the 298 models we track, by output price. Here's what it costs, how its price has moved, and where it fits.

output price · per 1M tokens
$3.08
input $0.98/1M · routed
Context
203K
Input / 1M
$0.98
Output / 1M
$3.08
Modality
Text only
Provider
Z.AI
Tokenizer
Other

Snapshot · source: OpenRouter ↗ · how we measure →

cost at a typical workload
$602 / mo

For 1,500 input + 500 output tokens across 200,000 requests/month. That's 100× the cheapest tracked option (Ling-2.6-flash, $6.00/mo).

Tune the workload in the calculator →

output price history
output / 1M

Flat at $3.08 since tracking began 2026-06-14. Full history →

Where it fits

  • A mid-range option — $0.98 in / $3.08 out per 1M with a 203K-token context.

Watch for

  • Priced from OpenRouter's routed market, not a first-party list price — availability and rate can shift without notice.
  • Text-only — no image, audio, or file input.

These notes are derived from price, context and modality — structural facts, not measured quality. Measured cost-to-finish-a-task lives on the real-cost index.

Related models

GLM 5 Turbo Z.AI · $4.00/1M out · 262K GLM 4.5 Z.AI · $2.20/1M out · 131K GLM 5 Z.AI · $1.92/1M out · 203K GLM 4.5V Z.AI · $1.80/1M out · 66K Nano Banana 2 (Gemini 3.1 Flash Image Preview) Google · $3.00/1M out · 131K Gemini 3 Flash Preview Google · $3.00/1M out · 1.0M

See how the leading models compare head-to-head →

How to read GLM 5.1's pricing

Two numbers decide most of the bill: $0.98/1M for input (everything you send — prompt, context, attachments) and $3.08/1M for output (everything it generates, including hidden reasoning tokens). Output is priced 3.1× the input rate here, so the shape of your workload — how much it reads versus writes — matters as much as the headline figure. This row is OpenRouter's routed market price; it can move as providers and routing change.

Frequently asked questions

How much does GLM 5.1 cost per million tokens?

GLM 5.1 is priced at $0.98 per 1M input tokens and $3.08 per 1M output tokens, from OpenRouter's routed market price as of the 2026-06-15 snapshot. Output is the figure that usually drives the bill. Enter your own token volumes in the cost calculator for a monthly estimate.

What is GLM 5.1's context window?

GLM 5.1 has a 203K-token context window — roughly 304 pages of text. Prompt, attachments, conversation and the model's own output all share that budget, and every token you send is billed at the input rate.

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