Gemini 2.5 Flash vs GPT-4o
Pricing, benchmarks, and use case comparison
Quick take
- •Gemini 2.5 Flash is meaningfully stronger at long context (88 vs 55 on our capability index).
- •Gemini 2.5 Flash is 88% cheaper on input tokens, which compounds fast on high-volume or agentic workloads.
- •GPT-4o has a 128,000 tokens (16,384 max output) context window vs 1,048,576 tokens (1M) input; up to 65,535 output - better for whole-repo or long-document work.
Specs comparison
| Gemini 2.5 Flash | GPT-4o | |
|---|---|---|
| Provider | Google DeepMind | OpenAI |
| Type | Closed source | Closed source |
| Context window | 1,048,576 tokens (1M) input; up to 65,535 output | ✓128,000 tokens (16,384 max output) |
| Input / 1M tokens | ✓$0.30 | $2.50 |
| Output / 1M tokens | $2.50 | $10.00 |
| Release date | 2025-06 | 2024-05 |
Benchmarks
| Benchmark | Gemini 2.5 Flash | GPT-4o |
|---|---|---|
| Context window | 1M tokens | - |
| Input price | $0.30/1M | - |
| MMLU | - | 88.7% |
| HumanEval | - | 90.2% |
| MATH | - | 76.6% |
Scores sourced from official provider release posts and independent benchmark aggregators.
Which should you choose?
Choose Gemini 2.5 Flash if...
- →High-volume, latency-sensitive production workloads
- →Chatbots, extraction, classification, and summarization at scale
- →You need decent reasoning but must control costs
Choose GPT-4o if...
- →Everyday assistant, drafting, summarization, and classification tasks
- →Latency- and cost-sensitive applications at scale
- →Multimodal tasks needing image understanding with fast responses