What is the difference between Gemini 2.5 Flash Preview 05-20 (thinking) and Grok 4.5?

Gemini 2.5 Flash Preview 05-20 (thinking) is developed by Google AI while Grok 4.5 is developed by xAI. Gemini 2.5 Flash Preview 05-20 (thinking) has a 1.0M token context window vs Grok 4.5's 500K. You can compare their actual outputs across 11 challenges on Rival to see how they differ in practice.

Which is better, Gemini 2.5 Flash Preview 05-20 (thinking) or Grok 4.5?

It depends on your use case. Gemini 2.5 Flash Preview 05-20 (thinking) and Grok 4.5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 11 challenges so you can judge which fits your needs best.

How much does Gemini 2.5 Flash Preview 05-20 (thinking) cost compared to Grok 4.5?

Gemini 2.5 Flash Preview 05-20 (thinking) costs $0.15/M input tokens and Grok 4.5 costs $2/M input tokens. Gemini 2.5 Flash Preview 05-20 (thinking) is $1.85/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Gemini 2.5 Flash Preview 05-20 (thinking) and Grok 4.5 on Rival?

This page shows a side-by-side comparison of Gemini 2.5 Flash Preview 05-20 (thinking) and Grok 4.5 across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

What is the difference between Gemini 2.5 Flash Preview 05-20 (thinking) and Grok 4.5?

Gemini 2.5 Flash Preview 05-20 (thinking) is developed by Google AI while Grok 4.5 is developed by xAI. Gemini 2.5 Flash Preview 05-20 (thinking) has a 1.0M token context window vs Grok 4.5's 500K. You can compare their actual outputs across 11 challenges on Rival to see how they differ in practice.

Which is better, Gemini 2.5 Flash Preview 05-20 (thinking) or Grok 4.5?

It depends on your use case. Gemini 2.5 Flash Preview 05-20 (thinking) and Grok 4.5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 11 challenges so you can judge which fits your needs best.

How much does Gemini 2.5 Flash Preview 05-20 (thinking) cost compared to Grok 4.5?

Gemini 2.5 Flash Preview 05-20 (thinking) costs $0.15/M input tokens and Grok 4.5 costs $2/M input tokens. Gemini 2.5 Flash Preview 05-20 (thinking) is $1.85/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Gemini 2.5 Flash Preview 05-20 (thinking) and Grok 4.5 on Rival?

This page shows a side-by-side comparison of Gemini 2.5 Flash Preview 05-20 (thinking) and Grok 4.5 across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

Gemini 2.5 Flash Preview 05-20 (thinking) vs Grok 4.5: Which Is Better?

Updated Jul 2026

Our Verdict

Grok 4.5

Gemini 2.5 Flash Preview 05-20 (thinking)Runner-up

No community votes yet. On paper, Grok 4.5 has the edge — bigger model tier, newer.

Too close to call

What do Gemini 2.5 Flash Preview 05-20 (thinking) and Grok 4.5 say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

Gemini 2.5 Flash Preview 05-20 (thinking)

Input

$0.15

13× cheaper

Output

$3.50

1.7× cheaper

Grok 4.5

Input

$2.00

Output

$6.00

Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper on both — 13× input, 1.7× output

Writing DNA

Style Comparison

Similarity

58%

Grok 4.5 uses 22.7x more hedging

Gemini 2.5 Flash Preview 05-20 (thinking)

Grok 4.5

70%Vocabulary61%

11wSentence Length16w

0.00Hedging0.23

4.2Bold2.5

7.3Lists2.4

0.00Emoji0.09

0.00Headings0.48

0.00Transitions0.06

Based on 3 + 27 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Gemini 2.5 Flash Preview 05-20 (thinking) vs MiniMax M3New provider

Gemini 2.5 Flash Preview 05-20 (thinking) vs Ox AlphaNew provider

Gemini 2.5 Flash Preview 05-20 (thinking) vs Claude Sonnet 4New provider

Updated Jul 2026

Our Verdict

Grok 4.5

Gemini 2.5 Flash Preview 05-20 (thinking)Runner-up

No community votes yet. On paper, Grok 4.5 has the edge — bigger model tier, newer.

Too close to call

What do Gemini 2.5 Flash Preview 05-20 (thinking) and Grok 4.5 say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

Gemini 2.5 Flash Preview 05-20 (thinking)

Input

$0.15

13× cheaper

Output

$3.50

1.7× cheaper

Grok 4.5

Input

$2.00

Output

$6.00

Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper on both — 13× input, 1.7× output

Writing DNA

Style Comparison

Similarity

58%

Grok 4.5 uses 22.7x more hedging

Gemini 2.5 Flash Preview 05-20 (thinking)

Grok 4.5

70%Vocabulary61%

11wSentence Length16w

0.00Hedging0.23

4.2Bold2.5

7.3Lists2.4

0.00Emoji0.09

0.00Headings0.48

0.00Transitions0.06

Based on 3 + 27 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Gemini 2.5 Flash Preview 05-20 (thinking) vs MiniMax M3New provider

Gemini 2.5 Flash Preview 05-20 (thinking) vs Ox AlphaNew provider

Gemini 2.5 Flash Preview 05-20 (thinking) vs Claude Sonnet 4New provider