glm-5.1 - ByteSpike

glm-5.1 is the published flagship from Zhipu’s 智谱 GLM family — strong on Chinese tasks, vision-capable. It supersedes the earlier glm-5 preview.

Pricing

Input	Cache read	Output
$1.40 / 1M	$0.26 / 1M	$4.40 / 1M

Cache write is billed at the input rate. See the pricing table for the live rate.

Protocols

Protocol	Path
OpenAI Chat Completions	`POST https://llm.bytespike.ai/v1/chat/completions`

Quickstart

curl https://llm.bytespike.ai/v1/chat/completions \
  -H "Authorization: Bearer $BYTESPIKE_API_KEY" \
  -H "content-type: application/json" \
  -d '{
    "model": "glm-5-1",
    "messages": [{ "role": "user", "content": "Hello, ByteSpike." }]
  }'

Capabilities

Capability	Supported
Chat Completions	✅
Streaming (SSE)	✅
Tools / function calling	✅
JSON mode	✅
Vision (image input)	✅
Context window	128K tokens

When to use

Chinese-language general chat — GLM-5.1 is competitive with Doubao on Chinese benchmarks.
Vision in CN region — good OCR / document understanding.

The earlier glm-5 preview is legacy and no longer the published flagship — use glm-5.1.

Next

doubao-seed-2.0-pro — ByteDance Chinese-LLM alternative
kimi-k2-6 — Moonshot long-context alternative