Gemini 2.5 Flash Preview 05-20 vs Gemini 2.5 Flash Preview 05-20 (thinking)

Compare Gemini 2.5 Flash Preview 05-20 and Gemini 2.5 Flash Preview 05-20 (thinking), both from Google AI, context windows of 1.0M vs 1.0M, tested across 10 shared challenges. Updated April 2026.

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

Gemini 2.5 Flash Preview 05-20 and Gemini 2.5 Flash Preview 05-20 (thinking) are both competitive models. Gemini 2.5 Flash Preview 05-20 costs $0.15/M input tokens vs $0.15/M for Gemini 2.5 Flash Preview 05-20 (thinking). Context windows: 1049K vs 1049K tokens. Compare their real outputs side by side below.

Key Differences Between Gemini 2.5 Flash Preview 05-20 and Gemini 2.5 Flash Preview 05-20 (thinking)

Gemini 2.5 Flash Preview 05-20 is made by google while Gemini 2.5 Flash Preview 05-20 (thinking) is from google. Gemini 2.5 Flash Preview 05-20 has a 1049K token context window compared to Gemini 2.5 Flash Preview 05-20 (thinking)'s 1049K. On pricing, Gemini 2.5 Flash Preview 05-20 costs $0.15/M input tokens vs $0.15/M for Gemini 2.5 Flash Preview 05-20 (thinking).

Our Verdict
Gemini 2.5 Flash Preview 05-20
Gemini 2.5 Flash Preview 05-20
Gemini 2.5 Flash Preview 05-20 (thinking)
Gemini 2.5 Flash Preview 05-20 (thinking)

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Gemini 2.5 Flash Preview 05-20 is 5.8x cheaper per token — worth considering if cost matters.

Too close to call
Writing DNA

Style Comparison

Similarity
99%

Gemini 2.5 Flash Preview 05-20 uses 26.4x more hedging

Gemini 2.5 Flash Preview 05-20
Gemini 2.5 Flash Preview 05-20 (thinking)
69%Vocabulary70%
10wSentence Length11w
0.26Hedging0.00
1.1Bold4.2
5.5Lists7.3
0.00Emoji0.00
0.00Headings0.00
0.00Transitions0.00
Based on 2 + 3 text responses
vs

Ask them anything yourself

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

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

AI Hallucination Index 2026
Free preview13 of 58 slides
FAQ

Common questions