Claude Opus 4.1 vs GPT OSS 20B
Compare Claude Opus 4.1 by Anthropic against GPT OSS 20B by OpenAI, context windows of 200K vs 131K, tested across 53 shared challenges. Updated June 2026.
Which is better, Claude Opus 4.1 or GPT OSS 20B?
Claude Opus 4.1 and GPT OSS 20B are both competitive models. Claude Opus 4.1 costs $15/M input tokens vs $0.02/M for GPT OSS 20B. Context windows: 200K vs 131K tokens. Compare their real outputs side by side below.
Key Differences Between Claude Opus 4.1 and GPT OSS 20B
Claude Opus 4.1 is made by anthropic while GPT OSS 20B is from openai. Claude Opus 4.1 has a 200K token context window compared to GPT OSS 20B's 131K. On pricing, Claude Opus 4.1 costs $15/M input tokens vs $0.02/M for GPT OSS 20B.
No community votes yet. On paper, Claude Opus 4.1 has the edge — bigger model tier, bigger context window.
GPT OSS 20B is 750x cheaper per token — worth considering if cost matters.
Cost per 1M tokens
GPT OSS 20B is cheaper on both — 750× input, 750× output
Style Comparison
Claude Opus 4.1 uses 5.2x more sentence length
