Head-to-Head API Cost Benchmark

Gemini 2.5 Flash vs OpenAI o3-mini: API Price & Latency Comparison

On a standard B2B production workload (5,000 req/day), Gemini 2.5 Flash is 87.6% cheaper ($71.16/mo vs $573.38/mo), while Gemini 2.5 Flash leads in token generation speed (180 tok/s).

Side-by-Side Specification & Billing Matrix

Metric Gemini 2.5 Flash (Google Gemini API) OpenAI o3-mini (OpenAI) Advantage
Standard Input / 1M Tokens $0.150 $1.100 Gemini 2.5 Flash
Cached Input / 1M Tokens $0.037 $0.550 Gemini 2.5 Flash
Output Generation / 1M Tokens $0.60 $4.40 Gemini 2.5 Flash
Intelligence / Benchmark Quality 1264 LMSYS Elo 1305 LMSYS Elo OpenAI o3-mini
Monthly Spend (5k req/day, 50% cache) $71.16 / mo $573.38 / mo Gemini 2.5 Flash (-87.6%)
Context Window 1,000,000 tokens 200,000 tokens Gemini 2.5 Flash
Output Speed (Throughput) 180 tokens/sec 95 tokens/sec Gemini 2.5 Flash
Batch API Discount -50% (Google Gemini API) -50% (OpenAI) Google Gemini API
Primary Workload Fit Large-scale data extraction, PDF/document parsing, high-throughput pipelines Algorithmic code generation, math, STEM reasoning, automated QA agents Workload Dependent
Deploy / Console Access Try Gemini 2.5 Flash → Try OpenAI o3-mini → Open Full Simulator