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Gemini 3 Flash Preview (free) vs Grok 4.5

Context lengths are 1,048,576 tokens on Gemini 3 Flash Preview (free) and 500,000 tokens on Grok 4.5. On the LMArena coding leaderboard Gemini 3 Flash Preview (free) scores 1509 and Grok 4.5 scores 1523.

GoogleGemini 3 Flash Preview (free)GrokGrok 4.5
+ Add model · 2/4
Google logo
Gemini 3 Flash Preview (free)
Google · text, image, audio, video → text

gemini-3-flash-preview-free is the free, publicly available version of gemini-3-flash-preview, offering the same model capabilities with usage limits in place to ensure service stability. Limits include up to 5 requests per minute, a maximum of 250 requests per day, and a daily quota of 500,000 tokens. Free usage is based on shared capacity and is limited in availability. This version is intended for testing and light usage; for consistent and reliable access, please switch to the paid model.

Input$0.00 /M
Output$0.00 /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.

Gemini 3 Flash Preview (free)
Grok 4.5
Input /M
$0.00
$2.00
Output /M
$0.00
$6.00
Cache read /M
$0.00
$0.50
Context length
1,048,576
500,000
Max output
65,536
500,000
Time to First Token
-
1.6 s
Throughput
-
25.8 tok/s
Modalities
textimageaudiovideo
textimage
Supported Parameters
toolsfunction callingstructured outputsthinking
thinkingtoolsfunction callingstructured outputslong context
API Formats
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.

gemini-3-flash-preview-freegrok-4.5

Tokens / day

-

Requests / day

-

Performance Past 3 Days

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

gemini-3-flash-preview-freegrok-4.5

Throughput (tok/s)

-

TTFT (s)

-

Uptime (%)

-

LMArena Benchmarks

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

Text
gemini-3-flash-preview-freegrok-4.5
1420146015001540
Overall
14701473
Coding
15091523
Math
14761478
Hard prompts
14921495
Instruction following
14581466
Multi-turn
14771483
Creative writing
14491459
Longer query
14751485
Chinese
15111521
English
14751475
Vision
gemini-3-flash-preview-freegrok-4.5
1240128013201360
Overall
12711282
OCR
12851295
Diagram
12961321
Homework
13141328
WebDev Arena
gemini-3-flash-preview-freegrok-4.5
13801440150015601620
Overall
14371556
React
14301559
HTML
14401577
Gaming
14521586
Simulations
14171598
Data analytics
14131522

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.

Gemini 3 Flash Preview (free)
$0.00 /mo
Grok 4.5
$210 /mo

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

FAQ

How do their coding arena scores compare?

Grok 4.5: 1523; Gemini 3 Flash Preview (free): 1509 (LMArena coding leaderboard).

How large is each context window?

Gemini 3 Flash Preview (free) accepts 1,048,576 and Grok 4.5 accepts 500,000 input tokens. Maximum output per request is 65,536 tokens on Gemini 3 Flash Preview (free) and 500,000 tokens on Grok 4.5.

What inputs and capabilities does each model support?

Gemini 3 Flash Preview (free) accepts text, image, audio and video input and supports tool calling, function calling, structured outputs and thinking; Grok 4.5 accepts text and image input and supports thinking, tool calling, function calling, structured outputs and long context.

Can I call Gemini 3 Flash Preview (free) 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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