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GLM 5.2 Fast Preview vs Grok 4.5

Compare GLM 5.2 Fast Preview from Z.AI and Grok 4.5 from Grok on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the AIHubMix API.

Z.AIGLM 5.2 Fast PreviewGrokGrok 4.5
+ Add model · 2/4
Z.AI logo
GLM 5.2 Fast Preview
Z.AI · text → text

GLM-5.2-Fast-Preview is the high-speed version of Zhipu AI’s flagship model GLM-5.2, supporting a 1M ultra-long context. The model’s capabilities are aligned with the GLM-5.2 standard version, offering logical reasoning, long-text understanding, and code generation. Through inference acceleration optimizations, output TPS can reach 1.5–2× that of the GLM-5.2 standard version, significantly improving output speed. It is suitable for scenarios sensitive to output speed, such as real-time dialogue, multi-turn Agent calls, and streaming code generation.

Input$2.25 /M
Output$7.89 /M
Details
Grok logo
Grok 4.5
Grok · text, image → text

Grok 4.5 was trained on datasets spanning knowledge in coding, science, engineering, and math. With both intelligent and efficient reasoning, Grok 4.5 excels at real engineering tasks and exceeds comparable leading models at these tasks.

Input$2.00 /M
Output$6.00 /M
Details

Pricing & Specifications

Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.

GLM 5.2 Fast Preview
Grok 4.5
Input /M
$2.25
$2.00
Output /M
$7.89
$6.00
Cache read /M
$0.56
$0.50
Context length
1,000,000
500,000
Max output
128,000
500,000
Time to First Token
2.0 s
1.5 s
Throughput
37.8 tok/s
25.7 tok/s
Modalities
text
textimage
Supported Parameters
thinkingtoolsfunction callingstructured outputs
thinkingtoolsfunction callingstructured outputslong context
API Formats
chat_completions · claude_api
Released
June 16, 2026
July 2026

Promotional prices show the discounted rate; see each model page for promotion windows.

Activity Past 30 Days

Daily traffic served through AIHubMix — how demand for each model is trending.

glm-5.2-fast-previewgrok-4.5

Tokens / day

-

Requests / day

-

Performance Past 3 Days

Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.

glm-5.2-fast-previewgrok-4.5

Throughput (tok/s)

-

TTFT (s)

-

Uptime (%)

-

LMArena Benchmarks

LMArena ratings by capability (Bradley-Terry, commonly called Elo). Higher is better.

Text
glm-5.2-fast-previewgrok-4.5
1420146015001540
Overall
14701470
Coding
15051523
Math
14751478
Hard prompts
14881495
Instruction following
14621466
Multi-turn
14701477
Creative writing
14491450
Longer query
14791485
Chinese
15111516
English
14751477
WebDev Arena
glm-5.2-fast-previewgrok-4.5
1500154015801620
Overall
15561582
React
15591594
HTML
15371577
Gaming
15861617
Simulations
15981606
Data analytics
15221542

Source: LMArena (arena.ai) leaderboard, imported by AIHubMix. Models without published ratings are omitted per chart.

Cost calculator

Estimate your monthly bill for the same workload on each model.

Grok 4.5
$210 /mo
GLM 5.2 Fast Preview
$254 /mo

Monthly = daily × 30. Discounted rates applied where a promotion is active.

FAQ

Which is cheaper: GLM 5.2 Fast Preview, Grok 4.5?

Grok 4.5: $6.00/M output tokens; GLM 5.2 Fast Preview: $7.89/M. Use the cost calculator above to estimate your own workload.

How do their coding arena scores compare?

Grok 4.5: 1523; GLM 5.2 Fast Preview: 1505 (LMArena coding leaderboard).

Which responds faster?

Grok 4.5: 1.5s time to first token measured on AIHubMix; see the live performance charts above for how each model behaves across the day.

How large is each context window?

GLM 5.2 Fast Preview accepts 1,000,000 and Grok 4.5 accepts 500,000 input tokens. Maximum output per request is 128,000 tokens on GLM 5.2 Fast Preview and 500,000 tokens on Grok 4.5.

Which one generates tokens faster?

GLM 5.2 Fast Preview at 37.8 tok/s and Grok 4.5 at 25.7 tok/s, measured as output throughput on AIHubMix — a separate metric from time to first token.

What inputs and capabilities does each model support?

GLM 5.2 Fast Preview accepts text input and supports thinking, tool calling, function calling and structured outputs; Grok 4.5 accepts text and image input and supports thinking, tool calling, function calling, structured outputs and long context.

Can I call GLM 5.2 Fast Preview and Grok 4.5 with the same API key?

Yes. AIHubMix serves every model on this page behind one OpenAI-compatible endpoint, so switching between them is a one-line change to the model field — no second account, key or SDK.

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