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Grok vs. ChatGPT vs. Gemini Comparison 2026: Complete Guide (Tested)

As of May 2026, three frontier AI models are distinct: Gemini 3.1 Pro leads in reasoning (GPQA Diamond 94.3%) and context (2M tokens); GPT-5.5 excels in coding (SWE-Bench 88.7%) and agentic workflows; Grok 4/4.3 offers real-time X data and the cheapest API ($1.25/$2.50 per million tokens). This guide uses official pricing, public benchmarks, and independent testing to help you choose based on your needs and budget.

SourceHacker News AIAuthor: carlual
Grok vs. ChatGPT vs. Gemini Comparison 2026: Complete Guide (Tested)
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Key points

  • Gemini 3.1 Pro tops reasoning benchmarks and has the largest context window (2M tokens) with moderate API pricing ($2/$12 per million tokens).
  • GPT-5.5 leads in coding (88.7% on SWE-Bench Verified) and ecosystem breadth, but its API doubled in price ($5/$30 per million tokens).
  • Grok 4.3 is the cheapest frontier reasoning model, with live X data access, ideal for real-time info and cost-sensitive applications.
  • All three are near-tied on general knowledge (MMLU ~92%); the choice hinges on specific tasks and budget.

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