GPT-3.5 Turbo vs Claude Opus 4

Compare GPT-3.5 Turbo by OpenAI against Claude Opus 4 by Anthropic, context windows of 16K vs 200K, tested across 15 shared challenges. Updated April 2026.

Which is better, GPT-3.5 Turbo or Claude Opus 4?

GPT-3.5 Turbo and Claude Opus 4 are both competitive models. GPT-3.5 Turbo costs $1.5/M input tokens vs $15/M for Claude Opus 4. Context windows: 16K vs 200K tokens. Compare their real outputs side by side below.

Key Differences Between GPT-3.5 Turbo and Claude Opus 4

GPT-3.5 Turbo is made by openai while Claude Opus 4 is from anthropic. GPT-3.5 Turbo has a 16K token context window compared to Claude Opus 4's 200K. On pricing, GPT-3.5 Turbo costs $1.5/M input tokens vs $15/M for Claude Opus 4.

Our Verdict
Claude Opus 4
Claude Opus 4
GPT-3.5 Turbo
GPT-3.5 TurboRunner-up

No community votes yet. On paper, Claude Opus 4 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
64%

Claude Opus 4 uses 444.0x more bold

GPT-3.5 Turbo
Claude Opus 4
61%Vocabulary64%
16wSentence Length62w
0.23Hedging0.52
0.0Bold4.4
3.7Lists9.1
0.00Emoji0.11
0.00Headings1.87
0.38Transitions0.27
Based on 11 + 16 text responses
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GPT-3.5 TurboClaude Opus 4

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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