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Google Gemini 2.5 Pro VS OpenAI GPT-5.6 Sol

✍️ Analysis by:the whichllmmodel Editorial Team|📅 Updated: June 2026

Decision Recommendation

⚖️ Editorial Verdict: In our analysis, GPT-5.6 Sol is the premium intelligence choice, scoring 5.0% higher on coding benchmarks. However, this accuracy premium comes with a cost overhead: Gemini 2.5 Pro is 3.3x cheaper to run. If you are building high-volume, simple chatbots or processing massive amounts of text where budget is critical, Gemini 2.5 Pro offers excellent cost savings. For agentic reasoning, code refactoring, or complex logical tasks, the accuracy premium of GPT-5.6 Sol fully justifies the cost.
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Model Specs

Gemini 2.5 Pro

Benchmarks & Scores

Coding (swe-bench-verified)
59.6%

good at editing existing code, cross-file updates, and multi-component systems

Reasoning (gpqa-diamond)
84.4%

graduate-level science QA

Cost & Performance

Cost (per 1M tokens)3.3x cheaper
$3.44Input: $1.25 | Output: $10.00
Context Window
1M tokens
Model Specs

GPT-5.6 Sol

Benchmarks & Scores

Coding (swe-bench-pro)
64.6%

excellent at multi-file repositories, autonomous agents, and industrial codebases

Reasoning (gpqa-diamond)Winner (+10.2%)
94.6%

graduate-level science QA

Cost & Performance

Cost (per 1M tokens)
$11.25Input: $5.00 | Output: $30.00
Context WindowLarger
1.05M tokens

Frequently Asked Questions about Gemini 2.5 Pro vs GPT-5.6 Sol comparison

Gemini 2.5 Pro is cheaper than GPT-5.6 Sol. Gemini 2.5 Pro has a blended cost of $3.44/1M tokens, which is about 3.3x cheaper than GPT-5.6 Sol at $11.25/1M tokens.

For coding tasks, Gemini 2.5 Pro scores 59.6% on swe-bench-verified (good at editing existing code, cross-file updates, and multi-component systems), while GPT-5.6 Sol scores 64.6% on swe-bench-pro (excellent at multi-file repositories, autonomous agents, and industrial codebases).