Gemini 2.5 Flash vs GPT-4o
2026 - Pricing, benchmarks, and use case comparison
Quick take
- •Gemini 2.5 Flash is 97% cheaper on input tokens - better for high-volume workloads.
- •Gemini 2.5 Flash has a 1M context window - 8x larger than GPT-4o's 128K. Better for long documents and large codebases.
Specs comparison
| Gemini 2.5 Flash | GPT-4o | |
|---|---|---|
| Provider | Google DeepMind | OpenAI |
| Type | Closed source | Closed source |
| Context window | ✓1M | 128K |
| Input / 1M tokens | ✓$0.075 | $2.50 |
| Output / 1M tokens | $0.30 | $10.00 |
| Release date | 2025-05 | 2024-05 |
Benchmarks
| Benchmark | Gemini 2.5 Flash | GPT-4o |
|---|---|---|
| MMLU | ~89% | 88.7% |
| HumanEval | ~85% | 90.2% |
| GPQA | - | 53.6% |
Scores sourced from official provider release posts.
Strengths
Gemini 2.5 Flash
- ✓Exceptional price-to-performance ratio
- ✓1M context at near-commodity pricing
- ✓Multimodal support at low cost
- ✓Fast inference latency
- ✓Strong summarization and classification
GPT-4o
- ✓Native multimodal input (text, image, audio)
- ✓Fast response times at this capability level
- ✓Strong on structured data and JSON output
- ✓Best ecosystem support across SDKs and tools
- ✓Real-time audio capabilities
Which should you choose?
Choose Gemini 2.5 Flash if you need...
- →High-volume, long-context tasks
- →Cost-sensitive production workloads
- →Document and media summarization
- →Retrieval-augmented pipelines
Choose GPT-4o if you need...
- →Multimodal apps
- →High-volume production use
- →Chatbots and assistants
- →Structured data extraction