Compare Claude Opus 4.1 by Anthropic against GPT OSS 120B by OpenAI, context windows of 200K vs 131K, tested across 27 shared challenges. Updated April 2026.
Claude Opus 4.1 and GPT OSS 120B are both competitive models. Claude Opus 4.1 costs $15/M input tokens vs $0.18/M for GPT OSS 120B. Context windows: 200K vs 131K tokens. Compare their real outputs side by side below.
Claude Opus 4.1 is made by anthropic while GPT OSS 120B is from openai. Claude Opus 4.1 has a 200K token context window compared to GPT OSS 120B's 131K. On pricing, Claude Opus 4.1 costs $15/M input tokens vs $0.18/M for GPT OSS 120B.
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
GPT OSS 120B is 94x cheaper per token — worth considering if cost matters.
Claude Opus 4.1 uses 4.6x more sentence length
vsAsk them anything yourself
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
27 fights queued
Tests an AI's ability to solve a simple but potentially confusing logic puzzle
Let me work through this step-by-step.
Sally has 3 brothers.
Each of Sally's brothers has 2 sisters.
Since Sally is a girl, she is one of the sisters that each brother has.
If each brother has 2 sisters total, and Sally is one of them, then there must be 1 other sister besides Sally.
Therefore, Sally has 1 sister.
Sally has one sister (apart from herself).
Each of her 3 brothers has exactly two sisters. Since the brothers share the same sisters, there are only two sisters in total—the two sisters are Sally and her one sister. Hence, Sally has one sister.
Tests an AI's randomness and creativity
Tests an AI's ability to create detailed SVG illustrations of gaming hardware
Tests an AI's ability to simulate personalities and predict future trends
Tests an AI's humor and understanding of current events
Tests an AI's ability to generate a complete, working landing page
Recreate an interactive, classic Mario level in a single HTML file.
Tests an AI's UI design skills with theming support
Tests an AI's ability to engage in philosophical discourse about AI rights
Generate SVG art of a randomly chosen animal in a setting of its choosing.
Generate a unique and simple recipe with common ingredients.
Create a starter plan for improving long-term health.
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