Head-to-Head API Cost Benchmark

Gemini 2.5 Flash vs GPT-4o: API Price & Latency Comparison

On a standard B2B production workload (5,000 req/day), Gemini 2.5 Flash is 94.5% cheaper ($71.16/mo vs $1303.12/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) GPT-4o (OpenAI) Advantage
Standard Input / 1M Tokens $0.150 $2.500 Gemini 2.5 Flash
Cached Input / 1M Tokens $0.037 $1.250 Gemini 2.5 Flash
Output Generation / 1M Tokens $0.60 $10.00 Gemini 2.5 Flash
Intelligence / Benchmark Quality 1264 LMSYS Elo 1286 LMSYS Elo GPT-4o
Monthly Spend (5k req/day, 50% cache) $71.16 / mo $1303.12 / mo Gemini 2.5 Flash (-94.5%)
Context Window 1,000,000 tokens 128,000 tokens Gemini 2.5 Flash
Output Speed (Throughput) 180 tokens/sec 85 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 Complex multi-step customer facing workflows, vision + JSON structured outputs Workload Dependent
Deploy / Console Access Try Gemini 2.5 Flash → Try GPT-4o → Open Full Simulator