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gemini-3.1-pro-preview vs grok-4.5

Output tokens cost $12.00 per million on gemini-3.1-pro-preview and $6.00 per million on grok-4.5. Input tokens cost $2.00 per million on gemini-3.1-pro-preview and $2.00 per million on grok-4.5. Cached input tokens are billed at $0.50 per million on gemini-3.1-pro-preview and $0.50 per million on grok-4.5. Context windows are 1,000,000 tokens on gemini-3.1-pro-preview and 1,000,000 tokens on grok-4.5. First-token latency measured on AIHubMix is 5.9s on gemini-3.1-pro-preview and 1.8s on grok-4.5. Measured output throughput is 79.5 tokens/s on gemini-3.1-pro-preview and 38.4 tokens/s on grok-4.5. On the LMArena coding leaderboard gemini-3.1-pro-preview scores 1521 and grok-4.5 scores 1520.

Googlegemini-3.1-pro-previewGrokgrok-4.5
+ Add model 2/4
Google
gemini-3.1-pro-preview
Google · text, image, audio, video → text

Gemini 3.1 Pro Preview is designed to further optimize the performance and reliability of the Gemini 3 Pro series, offering improved reasoning capabilities, greater token efficiency, and a more robust, factually consistent user experience. It is optimized for software-engineering behaviors and usability, and is also suitable for agent workflows that require precise tool invocation and reliable multi-step execution, enabling stable operation across a variety of real-world scenarios.

Input$2.00 /M
Output$12.00 /M
Details
Grok
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

Specs & Pricing

Prices are per million tokens. Latency and throughput are rolling averages measured on AIHubMix.

gemini-3.1-pro-preview
grok-4.5
Input price
$2.00
$2.00
Output price
$12.00
$6.00
Cache read
$0.50
$0.50
Context window
1,000,000
1,000,000
Max output
64,000
1,000,000
Latency (first token)
5.9 s
1.8 s
Throughput
79.5 TPS
38.4 TPS
Modalities
textimageaudiovideo
textimage
Features
thinkingtoolsfunction callingstructured outputswebdeepsearchlong context
thinkingtoolsfunction callingstructured outputslong context
Endpoints
chat_completions · gemini_api · claude_api

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

Usage on AIHubMix last 30 days

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

gemini-3.1-pro-previewgrok-4.5

Tokens / day

-

Requests / day

-

Live Performance last 3 days

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

gemini-3.1-pro-previewgrok-4.5

Throughput (TPS)

-

Latency (s)

-

Uptime (%)

-

Arena Scores

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

Text
gemini-3.1-pro-previewgrok-4.5
1420146015001540
Overall
14691485
Coding
15201521
Math
14881492
Hard prompts
14911507
Instruction following
14631481
Multi-turn
14721492
Creative writing
14481479
Longer query
14831498
Chinese
15251530
English
14741489
Vision
gemini-3.1-pro-previewgrok-4.5
12601280130013201340
Overall
12781282
OCR
12951295
Diagram
13091322
Homework
13101325
WebDev Arena
gemini-3.1-pro-previewgrok-4.5
13801440150015601620
Overall
14471549
React
14361550
HTML
14981593
Gaming
14671583
Simulations
14711598
Data analytics
14051514

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
gemini-3.1-pro-preview
$300 /mo

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

FAQ

Which is cheaper: gemini-3.1-pro-preview, grok-4.5?

grok-4.5: $6.00/M output tokens; gemini-3.1-pro-preview: $12.00/M. Use the cost calculator above to estimate your own workload.

How do their coding arena scores compare?

gemini-3.1-pro-preview: 1521; grok-4.5: 1520 (LMArena coding leaderboard).

Which responds faster?

grok-4.5: 1.8s first-token latency measured on AIHubMix; see the live performance charts above for how each model behaves across the day.

How large is each context window?

gemini-3.1-pro-preview accepts 1,000,000 and grok-4.5 accepts 1,000,000 input tokens. Maximum output per request is 64,000 tokens on gemini-3.1-pro-preview and 1,000,000 tokens on grok-4.5.

Which one generates tokens faster?

gemini-3.1-pro-preview at 79.5 tokens/s and grok-4.5 at 38.4 tokens/s, measured as output throughput on AIHubMix — a separate metric from first-token latency.

What inputs and capabilities does each model support?

gemini-3.1-pro-preview accepts text, image, audio and video input and supports thinking, tool calling, function calling, structured outputs, web search, deep search and long context; grok-4.5 accepts text and image input and supports thinking, tool calling, function calling, structured outputs and long context.

Can I call gemini-3.1-pro-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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