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GLM 5.3 Flash vs Grok 4.5

Compare GLM 5.3 Flash 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 5.3 FlashGrokGrok 4.5
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Z.AI logo
GLM 5.3 Flash
Z.AI · text, image, video → text

GLM-5.3-Flash is a high-efficiency multimodal model from Z.AI. It supports a context window of roughly 1 million tokens, along with text, image, and video inputs, and includes tool-calling capabilities. It is primarily designed for coding agents, complex reasoning, and long-horizon software engineering tasks. Built on the existing GLM technology stack, the model has been further post-trained and optimized to deliver strong performance while placing greater emphasis on inference efficiency, responsiveness, and cost.The model is offered at a limited-time 50% discount; users are welcome to try it.

Input$0.1127$0.0563 /M
Output$0.3944$0.1972 /M
Cache read$0.0282$0.0141 /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 5.3 Flash
Grok 4.5
Input /M
$0.1127$0.0563−50%
$2
Output /M
$0.3944$0.1972−50%
$6
Cache read /M
$0.0282$0.0141−50%
$0.5
Context length
1,000,000
500,000
Max output
128,000
500,000
Time to First Token
3.1 s
2.8 s
Throughput
96.0 tok/s
31.5 tok/s
Modalities
textimagevideo
textimage
Supported Parameters
thinkingtoolsfunction callingstructured outputs
thinkingtoolsfunction callingstructured outputslong context
API Formats
Released
August 26, 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-5.3-flashgrok-4.5

Tokens / day

-

Requests / day

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Performance Past 3 Days

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

glm-5.3-flashgrok-4.5

Throughput (tok/s)

-

TTFT (s)

-

Uptime (%)

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LMArena Benchmarks

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

Text
glm-5.3-flashgrok-4.5
14001440148015201560
Overall
14711474
Coding
15231534
Math
14751479
Hard prompts
14951496
Instruction following
14651466
Multi-turn
14661476
Creative writing
14311451
Longer query
14771487
Chinese
15121532
English
14751476
Vision
glm-5.3-flashgrok-4.5
124012801320
Overall
12731282
OCR
12841294
Diagram
13081319
Homework
13241324
WebDev Arena
glm-5.3-flashgrok-4.5
1500156016201680
Overall
15561605
React
15591635
HTML
15301571
Gaming
15891666
Simulations
15851639
Data analytics
15211539

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 5.3 Flash
$13$6.34 /mo
Grok 4.5
$210 /mo

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

FAQ

Which is cheaper: GLM 5.3 Flash, Grok 4.5?

GLM 5.3 Flash: $0.1972/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?

GLM 5.3 Flash: 1534; Grok 4.5: 1523 (LMArena coding leaderboard).

Which responds faster?

Grok 4.5: 2.8s 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 5.3 Flash accepts 1,000,000 and Grok 4.5 accepts 500,000 input tokens. Maximum output per request is 128,000 tokens on GLM 5.3 Flash and 500,000 tokens on Grok 4.5.

Which one generates tokens faster?

GLM 5.3 Flash at 96.0 tok/s and Grok 4.5 at 31.5 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 5.3 Flash accepts text, image and video 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 5.3 Flash 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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