Models

Gemini 2.5 Flash Preview 09 2025 vs Grok 4.5

Compare Gemini 2.5 Flash Preview 09 2025 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 Flash Preview 09 2025GrokGrok 4.5
Google logo
Gemini 2.5 Flash Preview 09 2025
Google · text, image, audio, video → text

This latest 2.5 Flash model comes with improvements in two key areas we heard consistent feedback on: Better agentic tool use: We've improved how the model uses tools, leading to better performance in more complex, agentic and multi-step applications. This model shows noticeable improvements on key agentic benchmarks, including a 5% gain on SWE-Bench Verified, compared to our last release (48.9% → 54%). More efficient: With thinking on, the model is now significantly more cost-efficient—achieving higher quality outputs while using fewer tokens, reducing latency and cost (see charts above).

Input$0.30 /M
Output$2.50 /M
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

Pricing & Specifications

Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.

Gemini 2.5 Flash Preview 09 2025
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
0.4 s
1.5 s
Throughput
144.3 tok/s
25.7 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-flash-preview-09-2025grok-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-flash-preview-09-2025grok-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-flash-preview-09-2025grok-4.5
1360142014801540
Overall
14041470
Coding
14281523
Math
14121478
Hard prompts
14201495
Instruction following
14021466
Multi-turn
14001477
Creative writing
13831449
Longer query
14171485
Chinese
14481511
English
14111475
Vision
gemini-2.5-flash-preview-09-2025grok-4.5
12001240128013201360
Overall
12261282
OCR
12401295
Diagram
12421321
Homework
12671328

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 Preview 09 2025
$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 Preview 09 2025, Grok 4.5?

Gemini 2.5 Flash Preview 09 2025: $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 Preview 09 2025: 1428 (LMArena coding leaderboard).

Which responds faster?

Gemini 2.5 Flash Preview 09 2025: 0.4s 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 Preview 09 2025 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 Preview 09 2025 and 500,000 tokens on Grok 4.5.

Which one generates tokens faster?

Gemini 2.5 Flash Preview 09 2025 at 144.3 tok/s and Grok 4.5 at 25.7 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 Preview 09 2025 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 Preview 09 2025 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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