Gemini 2.5 Flash vs GPT-4o
Benchmarks, API pricing and specs, head to head. Data updated 2026-06-10.
Gemini 2.5 Flash
Google · Jun 2025
The 2025 fast-tier favorite: hybrid reasoning, full multimodality and a 1M context at $0.30/$2.50.
GPT-4o
OpenAI · May 2024
The 2024 omni-modal classic with native audio in and out; superseded at the frontier but still everywhere in production.
The verdict
Gemini 2.5 Flash wins 3 of the 3 benchmarks these models share, against 0 for GPT-4o. On price the gap is dramatic: Gemini 2.5 Flash works out roughly 5.1x cheaper per blended million tokens. Gemini 2.5 Flash also takes 1.0M of context versus 128K for GPT-4o.
Benchmark head-to-head 3–0
Specs & pricing
| Gemini 2.5 Flash | GPT-4o | |
|---|---|---|
| modhub Index | — | — |
| Input price / 1M | $0.3 | $2.5 |
| Output price / 1M | $2.5 | $10 |
| Context window | 1.0M | 128K |
| Max output | 66K | 16K |
| Open weights | no | no |
| Reasoning model | yes | no |
| Multimodal input | text, image, audio, video | text, image, audio |
| Knowledge cutoff | Jan 2025 | Oct 2023 |
| Released | Jun 2025 | May 2024 |
| Example monthly cost* | $6.75 | $40.00 |
* 10M input + 1.5M output tokens per month at list prices, no caching. Green = better value on that row.
Frequently asked questions
- Which is better, Gemini 2.5 Flash or GPT-4o?
- Gemini 2.5 Flash wins 3 of the 3 benchmarks these models share, against 0 for GPT-4o. On price the gap is dramatic: Gemini 2.5 Flash works out roughly 5.1x cheaper per blended million tokens. Gemini 2.5 Flash also takes 1.0M of context versus 128K for GPT-4o.
- Which is cheaper, Gemini 2.5 Flash or GPT-4o?
- Gemini 2.5 Flash costs $0.3/$2.5 per million input/output tokens, while GPT-4o costs $2.5/$10. For a typical workload of 10M input and 1.5M output tokens per month, that's $6.75 versus $40.00.
- Which model is better for coding, Gemini 2.5 Flash or GPT-4o?
- On SWE-bench Verified — the standard agentic-coding benchmark — Gemini 2.5 Flash scores ~48.9% versus 33.2% for GPT-4o, making Gemini 2.5 Flash the stronger pick for coding agents.