What is the difference between Claude Sonnet 4 and Qwen3.5 Plus 2026-04-20?

Claude Sonnet 4 is developed by Anthropic while Qwen3.5 Plus 2026-04-20 is developed by Qwen. Claude Sonnet 4 has a 200K token context window vs Qwen3.5 Plus 2026-04-20's 1.0M. You can compare their actual outputs across 51 challenges on Rival to see how they differ in practice.

Which is better, Claude Sonnet 4 or Qwen3.5 Plus 2026-04-20?

It depends on your use case. Claude Sonnet 4 and Qwen3.5 Plus 2026-04-20 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 51 challenges so you can judge which fits your needs best.

How much does Claude Sonnet 4 cost compared to Qwen3.5 Plus 2026-04-20?

Claude Sonnet 4 costs $3/M input tokens and Qwen3.5 Plus 2026-04-20 costs $0.4/M input tokens. Qwen3.5 Plus 2026-04-20 is $2.60/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 Claude Sonnet 4 and Qwen3.5 Plus 2026-04-20 on Rival?

This page shows a side-by-side comparison of Claude Sonnet 4 and Qwen3.5 Plus 2026-04-20 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 Apr 2026

Claude Sonnet 4vsQwen3.5 Plus 2026-04-20

Qwen3.5 Plus 2026-04-20 is cheaper than Claude Sonnet 4 at $0.4/M vs $3/M input tokens.

Claude Sonnet 4 and Qwen3.5 Plus 2026-04-20 compared across 51 shared prompts
Spec	Claude Sonnet 4	Qwen3.5 Plus 2026-04-20
Input price	$3/M tokens	$0.4/M tokens
Output price	$15/M tokens	$2.4/M tokens
Context window	200K tokens	1.0M tokens
Weights	Closed	Open
Free API (OpenRouter)	No	No
Released	May 2025	Apr 2026