What is the difference between Gemini 2.5 Flash Preview 05-20 (thinking) and Qwen3.5 Plus 2026-02-15?

Gemini 2.5 Flash Preview 05-20 (thinking) is developed by Google AI while Qwen3.5 Plus 2026-02-15 is developed by Qwen. Gemini 2.5 Flash Preview 05-20 (thinking) has a 1.0M token context window vs Qwen3.5 Plus 2026-02-15's 1.0M. 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 Qwen3.5 Plus 2026-02-15?

It depends on your use case. Gemini 2.5 Flash Preview 05-20 (thinking) and Qwen3.5 Plus 2026-02-15 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 Qwen3.5 Plus 2026-02-15?

Gemini 2.5 Flash Preview 05-20 (thinking) costs $0.15/M input tokens and Qwen3.5 Plus 2026-02-15 costs $0.4/M input tokens. Gemini 2.5 Flash Preview 05-20 (thinking) is $0.25/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 Qwen3.5 Plus 2026-02-15 on Rival?

This page shows a side-by-side comparison of Gemini 2.5 Flash Preview 05-20 (thinking) and Qwen3.5 Plus 2026-02-15 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.

Updated Feb 2026

Gemini 2.5 Flash Preview 05-20 (thinking)vsQwen3.5 Plus 2026-02-15

Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper than Qwen3.5 Plus 2026-02-15 at $0.15/M vs $0.4/M input tokens.

Gemini 2.5 Flash Preview 05-20 (thinking) and Qwen3.5 Plus 2026-02-15 compared across 11 shared prompts
Spec	Gemini 2.5 Flash Preview 05-20 (thinking)	Qwen3.5 Plus 2026-02-15
Input price	$0.15/M tokens	$0.4/M tokens
Output price	$3.5/M tokens	$2.4/M tokens
Context window	1.0M tokens	1.0M tokens
Parameters	Not disclosed	Not disclosed
Weights	—	Closed
Free API (OpenRouter)	No	No
Released	May 2025	Feb 2026