What is the difference between GLM 5.1 and Owl Alpha?

GLM 5.1 is developed by Z.ai while Owl Alpha is developed by OpenRouter. GLM 5.1 has a 203K token context window vs Owl Alpha's 1.0M. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, GLM 5.1 or Owl Alpha?

It depends on your use case. GLM 5.1 and Owl Alpha each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does GLM 5.1 cost compared to Owl Alpha?

GLM 5.1 costs $1.4/M input tokens and Owl Alpha costs $0/M input tokens. Owl Alpha is $1.40/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 GLM 5.1 and Owl Alpha on Rival?

This page shows a side-by-side comparison of GLM 5.1 and Owl Alpha 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

GLM 5.1vsOwl Alpha

Owl Alpha is cheaper than GLM 5.1 at $0/M vs $1.4/M input tokens.

GLM 5.1 and Owl Alpha compared across 53 shared prompts
Spec	GLM 5.1	Owl Alpha
Input price	$1.4/M tokens	Free
Output price	$4.4/M tokens	Free
Context window	203K tokens	1.0M tokens
Weights	Open	—
Free API (OpenRouter)	No	No
Released	Apr 2026	Apr 2026