Claude 3 Opus vs GPT OSS 20B
Compare Claude 3 Opus by Anthropic against GPT OSS 20B by OpenAI, context windows of 200K vs 131K, tested across 12 shared challenges. Updated June 2026.
Which is better, Claude 3 Opus or GPT OSS 20B?
Claude 3 Opus and GPT OSS 20B are both competitive models. Claude 3 Opus 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 3 Opus and GPT OSS 20B
Claude 3 Opus is made by anthropic while GPT OSS 20B is from openai. Claude 3 Opus has a 200K token context window compared to GPT OSS 20B's 131K. On pricing, Claude 3 Opus costs $15/M input tokens vs $0.02/M for GPT OSS 20B.
No community votes yet. On paper, Claude 3 Opus 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
GPT OSS 20B uses 591.9x more bold
