Claude 3 Opus vs GPT-3.5 Turbo

Compare Claude 3 Opus by Anthropic against GPT-3.5 Turbo by OpenAI, context windows of 200K vs 16K, tested across 12 shared challenges. Updated April 2026.

Which is better, Claude 3 Opus or GPT-3.5 Turbo?

Claude 3 Opus and GPT-3.5 Turbo are both competitive models. Claude 3 Opus costs $15/M input tokens vs $1.5/M for GPT-3.5 Turbo. Context windows: 200K vs 16K tokens. Compare their real outputs side by side below.

Key Differences Between Claude 3 Opus and GPT-3.5 Turbo

Claude 3 Opus is made by anthropic while GPT-3.5 Turbo is from openai. Claude 3 Opus has a 200K token context window compared to GPT-3.5 Turbo's 16K. On pricing, Claude 3 Opus costs $15/M input tokens vs $1.5/M for GPT-3.5 Turbo.

Our Verdict
Claude 3 Opus
Claude 3 Opus
GPT-3.5 Turbo
GPT-3.5 TurboRunner-up

No community votes yet. On paper, Claude 3 Opus has the edge — bigger model tier, newer, bigger context window.

GPT-3.5 Turbo is 38x cheaper per token — worth considering if cost matters.

Slight edge
Writing DNA

Style Comparison

Similarity
96%

GPT-3.5 Turbo uses 6.8x more transitions

Claude 3 Opus
GPT-3.5 Turbo
54%Vocabulary61%
14wSentence Length16w
0.48Hedging0.23
0.0Bold0.0
3.0Lists3.7
0.00Emoji0.00
0.00Headings0.00
0.06Transitions0.38
Based on 3 + 11 text responses
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Claude 3 OpusGPT-3.5 Turbo

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

AI Hallucination Index 2026
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