GoogleGemini 2.5 ProVSOpenAIGPT-5.5
Our Take
We recommend GPT-5.5 if you need peak intelligence for complex complex codebases, multi-file repositories, and architectural planning, or the 3.3x cheaper Gemini 2.5 Pro if your workflow is limited to multi-file code and clearly defined tasks. While GPT-5.5 holds a major reasoning advantage, Gemini 2.5 Pro is optimized for high-volume budget pipelines. Choose GPT-5.5 for architectural codebase planning, or Gemini 2.5 Pro to maximize your budget for basic scripts.
▶WHY?
Benchmark Calculations & Evidence:
Coding Evaluation: Gemini 2.5 Pro was evaluated on SWE-bench Verified (scoring 59.6%), while GPT-5.5 was evaluated on SWE-bench Pro (scoring 58.6%).
Reasoning Accuracy: Both models were evaluated on the GPQA Diamond benchmark. GPT-5.5 scored 93.6%, while Gemini 2.5 Pro scored 84.4%.
Cost Efficiency: Gemini 2.5 Pro pricing ($1.25/M input, $10/M output) is 3.3x cheaper than GPT-5.5 ($5/M input, $30/M output).
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Benchmarks & Scores
Coding (swe-bench-verified)
59.6%multi-file code and clearly defined tasks
Reasoning (gpqa-diamond)
84.4%graduate-level science QA
Cost & Context
Cost (per 1M tokens)3.3x cheaper
$3.44Input: $1.25 | Output: $10.00Context Window
1.05M tokensBenchmarks & Scores
Coding (swe-bench-pro)
58.6%complex codebases, multi-file repositories, and architectural planning
Reasoning (gpqa-diamond)Winner (+9.2%)
93.6%graduate-level science QA
Cost & Context
Cost (per 1M tokens)
$11.25Input: $5.00 | Output: $30.00Context WindowLarger
1.05M tokensFrequently Asked Questions about Gemini 2.5 Pro vs GPT-5.5
Gemini 2.5 Pro is cheaper than GPT-5.5. Gemini 2.5 Pro has a blended cost of $3.44/1M tokens, which is about 3.3x cheaper than GPT-5.5 at $11.25/1M tokens.
For coding tasks, Gemini 2.5 Pro scores 59.6% on swe-bench-verified (multi-file code and clearly defined tasks), while GPT-5.5 scores 58.6% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning).
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