About Gemini 2.5 Pro
Gemini 2.5 Pro was the model that established Google's thinking-model approach in general availability — Google describes it as the most advanced of the Gemini 2.5 family, built for complex tasks with deep reasoning and coding capability. It remains a stable, fully supported release with the family's signature range: multimodal input including audio and video, and a million-token-class context window.
With the Gemini 3 line above it, its role has shifted from frontier to known quantity — the version teams stay on when validated behaviour matters more than headline capability.
About GPT-4o
GPT-4o is OpenAI's omni-generation model, the first in its lineup designed from the start around multimodal input, and the ChatGPT default for a long stretch before the GPT-5 era. In the API it takes text and images and returns text, with a context window that is modest by later standards.
OpenAI keeps it available primarily for continuity: a large base of integrations was built against its exact behaviour, and like-for-like stability matters more there than headline capability. New work generally starts on the GPT-5 family, which OpenAI positions as its successor in every role GPT-4o played.
Frequently asked questions
Which is cheaper, Gemini 2.5 Pro or GPT-4o?
On a mixed workload (10K input / 2K output tokens per request), Gemini 2.5 Pro costs $0.033 per request versus $0.045 for GPT-4o — about 1.4× less. List rates: Gemini 2.5 Pro is $1.25/M input and $10/M output; GPT-4o is $2.5/M input and $10/M output.
What does a typical chat message cost on Gemini 2.5 Pro vs GPT-4o?
A short chat message (about 500 input and 250 output tokens) costs roughly $0.0031 with Gemini 2.5 Pro and $0.0037 with GPT-4o. At 1,000 messages a day that is about $93.75 versus $112.50 per month.
Do Gemini 2.5 Pro and GPT-4o have the same context window?
No. Gemini 2.5 Pro accepts up to 1024K tokens of input; GPT-4o accepts up to 125K. For workloads built around very large prompts, that difference can matter as much as the per-token rates.
Related
Compare all models at once ·Gemini 2.5 Pro pricing in detail ·GPT-4o pricing in detail ·Count tokens in your prompt
Last updated 2026-09-03. Prices verified against each provider's official pricing page; see the methodology.