ChatGPT-4o (March 2025) vs Claude Sonnet 3.6 (2022-10-22)

Compare ChatGPT-4o (March 2025) by OpenAI against Claude Sonnet 3.6 (2022-10-22) by Anthropic, context windows of 128K vs 200K, tested across 32 shared challenges. Updated February 2026.

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