Gemini 2.5 Pro vs GPT-4o
A complete head-to-head: pricing, context window, benchmarks, modality coverage, and openness, with a programmatic verdict synthesized from the underlying data.
Updated
Gemini 2.5 Pro specs · GPT-4o specs- PriceTie
Both land near $10.00 / 1M output tokens, call it a wash on cost.
- Context windowGemini 2.5 Pro
Gemini 2.5 Pro accepts 2.1M tokens vs 128K, 16.4× the room for long documents and codebases.
- BenchmarksGPT-4o
GPT-4o leads in 1 of 1 shared benchmarks; the biggest gap is on MMLU (broad academic knowledge), where it scores 88.7 vs 86.0.
- ModalitiesGemini 2.5 Pro
Gemini 2.5 Pro supports 4 modalities (text, vision, audio, video) vs 3 for GPT-4o.
- OpennessTie
Both are closed-weight, API-only.
On balance Gemini 2.5 Pro edges ahead, winning 2 of 5 categories against GPT-4o's 1. Both land near $10.00 / 1M output tokens, call it a wash on cost. Gemini 2.5 Pro accepts 2.1M tokens vs 128K, 16.4× the room for long documents and codebases.
GPT-4o leads in 1 of 1 shared benchmarks; the biggest gap is on MMLU (broad academic knowledge), where it scores 88.7 vs 86.0. They differ in modality coverage, Gemini 2.5 Pro handles text, vision, audio, video while GPT-4o handles text, vision, audio, which can be the deciding factor before you even look at benchmarks. Both are closed-weight, API-only.
Gemini 2.5 Pro is the newer of the two, released 11 months after GPT-4o, which usually means a more recent knowledge cutoff and updated safety post-training. Gemini 2.5 Pro is usually picked for long context and rag workloads, while GPT-4o sees more deployments in chatbots and vision. If pricing matters more than every last benchmark point, run the numbers in the calculator below before committing.
Side-by-side specs
| Spec | Gemini 2.5 Pro | GPT-4o |
|---|---|---|
| Provider | OpenAI | |
| Released | Mar 2025 | May 2024 |
| Modalities | text, vision, audio, video | text, vision, audio |
| Context window | 2.1M tokens | 128K tokens |
| Max output | , | , |
| Input · 1M | $1.25 / 1M tokens | $2.50 / 1M tokens |
| Output · 1M | $10.00 / 1M tokens | $10.00 / 1M tokens |
| Knowledge cutoff | 2025-01 | 2023-10 |
| Open weights | No | No |
| API available | Yes | Yes |
Pricing at scale
What you'd actually pay at typical workloads. Numbers come from each model's published per-million-token rates.
- Light usage, 100k in / 50k out per day$18.75 vs $22.50
- Heavy usage, 1M in / 500k out per day$188 vs $225
- RAG workload, 5M in / 200k out per day$248 vs $435
Light usage, 100k in / 50k out per day: $18.75 vs $22.50 per month, model A comes out ahead. Heavy usage, 1M in / 500k out per day: $188 vs $225 per month, model A comes out ahead. RAG workload, 5M in / 200k out per day: $248 vs $435 per month, model A comes out ahead.
Estimated spend for the listed models at your usage. Numbers are derived from each model's published per-million-token rates.
- Gemini 2.5 Pro$0.625
- GPT-4o$0.750
Benchmarks compared
Only sourced numbers. Where a benchmark is missing for one model we show the available value rather than fabricating the other.
- MMLU86.088.7
- HumanEval,90.2
- GPQA84.0
Gemini 2.5 Pro fits when…
- 2M-token context window
- Strong on long-document tasks
- Native multimodal handling
- Long-context tasks, handles 2.1M tokens vs 128K for GPT-4o.
- Multimodal needs covering video.
GPT-4o fits when…
- Native multimodal
- Mature SDK and tooling
Consider Gemini 3 Pro
Google's late-2025 flagship, set new benchmarks on long-context, vision, and reasoning at competitive pricing.
Frequently asked
Is Gemini 2.5 Pro or GPT-4o cheaper?
Both Gemini 2.5 Pro and GPT-4o are priced equivalently at $10.00 / 1M tokens per million output tokens.Which has the larger context window?
Gemini 2.5 Pro accepts 2.1M tokens vs 128K for GPT-4o.Is Gemini 2.5 Pro or GPT-4o better for coding?
Both Gemini 2.5 Pro and GPT-4o are competitive on coding benchmarks. See each model's individual spec page for HumanEval and SWE-bench scores where published. For an opinionated pick, consult our Best LLM for Coding ranking.Are either of these models open source?
Neither model ships open weights, both are accessible only via their respective providers' APIs.When were Gemini 2.5 Pro and GPT-4o released?
Gemini 2.5 Pro was released by Google on 2025-03-25. GPT-4o was released by OpenAI on 2024-05-13.
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