GLM-5.1

Z.ai's flagship model for long-horizon agents and complex engineering tasks.

Input price: $0.66–$0.9636list $0.825-20%
Output price: $2.6408–$3.8544list $3.301-20%
Context: 200K
Max output: 128K
Modalities: InputTextOutputText
Capability: 150 (#50 of 89)
Human preference: 1463
30-day uptime: —
Released: 2026-04-08
Knowledge cutoff: 2025-04

Providers

Providers that serve this model. With Auto, each request goes to the best available provider. Prices in USD per 1M tokens; stats cover the last 30 days.

AutoInput$0.66–$0.9636-20%Output$2.6408–$3.8544-20%Cache read$0.132–$0.20878-20%Context200KMax output128KWe send each request to the best-priced healthy provider. You pay that provider’s price.Alibaba Cloud (Model Studio Intl)CheapestInput$0.66–$0.88-20%Output$2.6408–$3.0808-20%Cache read$0.132–$0.176-20%Global (HK/DE/JP)No trainingZhipu AI (ChatGLM)Input$0.9636Output$3.8544Cache read$0.20878ChinaNo training

Pricing

Prices vary by provider. Showing Alibaba Cloud (Model Studio Intl), the lowest. Pick a provider above to see its prices.

Prompt ≤ 32K tokens

Input: $0.66list $0.825-20%; per 1M tokens
Output: $2.6408list $3.301-20%; per 1M tokens
Cache read: $0.132list $0.165-20%; per 1M tokens
Cache write (5 min): $0.8248list $1.031-20%; per 1M tokens

Prompt > 32K tokens

Input: $0.88list $1.10-20%; per 1M tokens
Output: $3.0808list $3.851-20%; per 1M tokens
Cache read: $0.176list $0.22-20%; per 1M tokens
Cache write (5 min): $1.10list $1.375-20%; per 1M tokens

Make a request

Set your provider preferences, then copy the request. It reads your API key from OHMYGPT_API_KEY.

Keep conversations on one provider

Later turns reuse the provider’s prompt cache, which can lower cost and latency.

Providers

Zhipu AI (ChatGLM)

Alibaba Cloud (Model Studio Intl)

curl https://api.ohmygpt.com/v1/chat/completions \
  -H "Authorization: Bearer $OHMYGPT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "zhipu/glm-5.1",
    "messages": [
      {
        "role": "user",
        "content": "Hello"
      }
    ]
  }'

Similar models

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Better value: more capable, lower price
Pareto frontier
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Capability scores are from Epoch AI’s Epoch Capabilities Index (CC BY 4.0, as of 2026-11-02), which combines dozens of benchmarks with GPT-5 set at 150. epoch.ai/eci

Price: our current input price per 1M tokens in USD, lowest across channels. Dated snapshots and resold copies of the same model are merged into one point; free models are not shown.

Shaded area: capability above and price below the median of all models. Pareto frontier: no other model is both cheaper and more capable.

GLM-5.1This model

Capability: 150
Input: $0.66–$0.9636
Output: $2.6408–$3.8544

GPT Realtime 2.1 Mini

Capability: —
Input: $0.66
Output: $2.64

GLM-5.2

Capability: 152
Input: $0.66–$0.9344
Output: $2.3106–$3.2704

MiniMax M2.5 Highspeed

Capability: —
Input: $0.66
Output: $2.64

Kimi K2 Thinking

Capability: 146
Input: $0.66
Output: $2.75

Human preference ratings are from the LMArena Text Arena (CC BY 4.0, as of 2026-10-28): Elo ratings from blind votes, on a different scale from capability scores. lmarena.ai/leaderboard/text