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Gemini 3.1 Pro Preview Customtools vs Grok 4.5

Output tokens cost $12.00 per million on Gemini 3.1 Pro Preview Customtools and $6.00 per million on Grok 4.5. Input tokens cost $2.00 per million on Gemini 3.1 Pro Preview Customtools 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 Customtools and $0.50 per million on Grok 4.5. Context lengths are 1,000,000 tokens on Gemini 3.1 Pro Preview Customtools and 500,000 tokens on Grok 4.5. Time to first token (TTFT) measured on AIHubMix is 2.7s on Gemini 3.1 Pro Preview Customtools and 1.8s on Grok 4.5. Measured output throughput is 103.4 tok/s on Gemini 3.1 Pro Preview Customtools and 26.6 tok/s on Grok 4.5.

GoogleGemini 3.1 Pro Preview CustomtoolsGrokGrok 4.5
+ Add model · 2/4
Google logo
Gemini 3.1 Pro Preview Customtools
Google · text, image, audio, video → text

gemini-3.1-pro-preview-customtools For users who build applications mixing bash and custom tools, the Gemini 3.1 Pro preview provides a separate endpoint accessible via the API call gemini-3.1-pro-preview-customtools. This endpoint is better at prioritizing your custom tools (for example, view_file or search_code). Please note that while gemini-3.1-pro-preview-customtools is optimized for agent workflows that use custom tools and Bash, you may experience quality fluctuations in some use cases that cannot benefit from these tools.

Input$2.00 /M
Output$12.00 /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 3.1 Pro Preview Customtools
Grok 4.5
Input /M
$2.00
$2.00
Output /M
$12.00
$6.00
Cache read /M
$0.50
$0.50
Context length
1,000,000
500,000
Max output
64,000
500,000
Time to First Token
2.7 s
1.8 s
Throughput
103.4 tok/s
26.6 tok/s
Modalities
textimageaudiovideo
textimage
Supported Parameters
thinkingtoolsfunction callingstructured outputswebdeepsearchlong context
thinkingtoolsfunction callingstructured outputslong context
API Formats
chat_completions · gemini_api · 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.

gemini-3.1-pro-preview-customtoolsgrok-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.

gemini-3.1-pro-preview-customtoolsgrok-4.5

Throughput (tok/s)

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TTFT (s)

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Uptime (%)

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Cost calculator

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

Grok 4.5
$210 /mo
Gemini 3.1 Pro Preview Customtools
$300 /mo

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

FAQ

Which is cheaper: Gemini 3.1 Pro Preview Customtools, Grok 4.5?

Grok 4.5: $6.00/M output tokens; Gemini 3.1 Pro Preview Customtools: $12.00/M. Use the cost calculator above to estimate your own workload.

Which responds faster?

Grok 4.5: 1.8s 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?

Gemini 3.1 Pro Preview Customtools accepts 1,000,000 and Grok 4.5 accepts 500,000 input tokens. Maximum output per request is 64,000 tokens on Gemini 3.1 Pro Preview Customtools and 500,000 tokens on Grok 4.5.

Which one generates tokens faster?

Gemini 3.1 Pro Preview Customtools at 103.4 tok/s and Grok 4.5 at 26.6 tok/s, measured as output throughput on AIHubMix — a separate metric from time to first token.

What inputs and capabilities does each model support?

Gemini 3.1 Pro Preview Customtools 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 Customtools 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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