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  5. Gemini 2.5 Flash Preview (thinking)vsGPT-4
Updated Apr 2025

Gemini 2.5 Flash Preview (thinking)vsGPT-4

Gemini 2.5 Flash Preview (thinking) is cheaper than GPT-4 at $0.175/M vs $30/M input tokens.

Gemini 2.5 Flash Preview (thinking) and GPT-4 compared across 8 shared prompts
SpecGemini 2.5 Flash Preview (thinking)GPT-4
Input price$0.175/M tokens$30/M tokens
Output price$3.5/M tokens$60/M tokens
Context window1.0M tokens8K tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedApr 2025May 2023
Our Verdict
Gemini 2.5 Flash Preview (thinking)
Gemini 2.5 Flash Preview (thinking)
GPT-4
GPT-4

Not enough votes to call it. On the specs, nothing separates them.

Gemini 2.5 Flash Preview (thinking) costs 17x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Gemini 2.5 Flash Preview (thinking)
Input
$0.17
171× cheaper
Output
$3.50
17× cheaper
GPT-4
Input
$30.00
Output
$60.00

Gemini 2.5 Flash Preview (thinking) is cheaper on both: 171× input, 17× output.

Where to run it

2 hosts

Gemini 2.5 Flash Preview (thinking)

No hosts listed on OpenRouter.

GPT-42 hosts
HostInOutContextUptime
Azure AI Foundry$30.00 in·$60.00 out·8k·100% upOpenAI$30.00 in·$60.00 out·8k·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 11 Sep 2026.

Writing DNA

Style Comparison

Similarity
47%

Gemini 2.5 Flash Preview (thinking) uses 5.4x more bold

Gemini 2.5 Flash Preview (thinking)
GPT-4
53%Vocabulary59%
14wSentence Length18w
0.38Hedging1.10
4.4Bold0.8
4.1Lists2.5
0.00Emoji0.00
0.00Headings0.00
0.24Transitions0.45
Based on 7 + 15 text responses
Research

What we learned reading every model

FAQ

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