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GLM 5.1 vs Grok 4.5

Compare GLM 5.1 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 5.1GrokGrok 4.5
+ Add model · 2/4
Z.AI logo
GLM 5.1
Z.AI · text → text

GLM-5.1 is Zhipu's latest flagship model, with greatly enhanced coding capabilities and significantly improved long-range task performance. It can continuously and autonomously work for up to 8 hours on a single task, completing the full closed loop from planning and execution to iterative optimization, delivering engineering-grade results. In terms of general capability and coding ability, GLM-5.1's overall performance aligns with Claude Opus 4.6, and it demonstrates stronger sustained work capability in long-range autonomous execution, complex engineering optimization, and real-world development scenarios, making it an ideal foundation for building Autonomous Agents and long-horizon Coding Agents.

Input$0.845 /M
Output$3.38 /M
Cache read$0.1831 /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 /M
Output$6 /M
Cache read$0.5 /M
Details

Pricing & Specifications

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

GLM 5.1
Grok 4.5
Input /M
$0.845
$2
Output /M
$3.38
$6
Cache read /M
$0.1831
$0.5
Context length
200,000
500,000
Max output
128,000
500,000
Time to First Token
1.3 s
2.8 s
Throughput
22.1 tok/s
31.5 tok/s
Modalities
text
textimage
Supported Parameters
thinkingtoolsfunction callingstructured outputs
thinkingtoolsfunction callingstructured outputslong context
API Formats
chat_completions · claude_api
Released
-
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-5.1grok-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-5.1grok-4.5

Throughput (tok/s)

-

TTFT (s)

-

Uptime (%)

-

LMArena Benchmarks

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

Text
glm-5.1grok-4.5
1420146015001540
Overall
14661471
Coding
15141523
Math
14771479
Hard prompts
14891495
Instruction following
14601466
Multi-turn
14761478
Creative writing
14471451
Longer query
14821487
Chinese
15121517
English
14761480
WebDev Arena
glm-5.1grok-4.5
14601500154015801620
Overall
15081556
React
15041559
HTML
15181571
Gaming
15411589
Simulations
15451585
Data analytics
14941521

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.

GLM 5.1
$101 /mo
Grok 4.5
$210 /mo

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

FAQ

Which is cheaper: GLM 5.1, Grok 4.5?

GLM 5.1: $3.38/M output tokens; Grok 4.5: $6/M. Use the cost calculator above to estimate your own workload.

How do their coding arena scores compare?

Grok 4.5: 1523; GLM 5.1: 1514 (LMArena coding leaderboard).

Which responds faster?

GLM 5.1: 1.3s 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 5.1 accepts 200,000 and Grok 4.5 accepts 500,000 input tokens. Maximum output per request is 128,000 tokens on GLM 5.1 and 500,000 tokens on Grok 4.5.

Which one generates tokens faster?

Grok 4.5 at 31.5 tok/s and GLM 5.1 at 22.1 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 5.1 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 5.1 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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