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Gemini 2.5 Flash vs Grok 4.5

Compare Gemini 2.5 Flash from Google 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.

GoogleGemini 2.5 FlashGrokGrok 4.5
+ Add model · 2/4
Google logo
Gemini 2.5 Flash
Google · text, image, audio, video → text

Gemini 2.5 Flash is Google’s best model in terms of both performance and cost efficiency, offering a comprehensive set of capabilities. It is the first Flash model to support visible reasoning, allowing insight into the thought process behind its responses. With its strong price–performance ratio, the model is well suited for large-scale processing, low-latency, high-throughput tasks that require reasoning, as well as agent-based application scenarios.

Input$0.30 /M
Output$2.50 /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 2.5 Flash
Grok 4.5
Input /M
$0.30
$2.00
Output /M
$2.50
$6.00
Cache read /M
$0.03
$0.50
Context length
1,048,576
500,000
Max output
65,536
500,000
Time to First Token
1.8 s
1.5 s
Throughput
104.5 tok/s
26.6 tok/s
Modalities
textimageaudiovideo
textimage
Supported Parameters
toolsfunction callingstructured outputs
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-2.5-flashgrok-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-2.5-flashgrok-4.5

Throughput (tok/s)

-

TTFT (s)

-

Uptime (%)

-

LMArena Benchmarks

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

Text
gemini-2.5-flashgrok-4.5
13801420146015001540
Overall
14101470
Coding
14241523
Math
14061478
Hard prompts
14201495
Instruction following
14011466
Multi-turn
14041477
Creative writing
13971449
Longer query
14191485
Chinese
14441511
English
14121475
Vision
gemini-2.5-flashgrok-4.5
1180124013001360
Overall
12141282
OCR
12221295
Diagram
12341321
Homework
12381328

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 2.5 Flash
$55.49 /mo
Grok 4.5
$210 /mo

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

FAQ

Which is cheaper: Gemini 2.5 Flash, Grok 4.5?

Gemini 2.5 Flash: $2.50/M output tokens; Grok 4.5: $6.00/M. Use the cost calculator above to estimate your own workload.

How do their coding arena scores compare?

Grok 4.5: 1523; Gemini 2.5 Flash: 1424 (LMArena coding leaderboard).

Which responds faster?

Grok 4.5: 1.5s 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 2.5 Flash accepts 1,048,576 and Grok 4.5 accepts 500,000 input tokens. Maximum output per request is 65,536 tokens on Gemini 2.5 Flash and 500,000 tokens on Grok 4.5.

Which one generates tokens faster?

Gemini 2.5 Flash at 104.5 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 2.5 Flash accepts text, image, audio and video input and supports 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 Gemini 2.5 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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