Back to Voice & realtime
Model comparison
Gemini 3.8 Live vs GPT-Realtime-2.1
Compare Gemini 3.8 Live and GPT-Realtime-2.1 using the same provider-sourced voice & realtime rubric. No mystery score and no invented benchmark ranking.
Quick take
Gemini 3.8 Live
Google's real-time voice model for responsive conversations with audio, text and visual context.
Best for
- Conversational customer support
- Voice assistants with camera context
- Everyday tool-using voice agents
Watch out for
Audio input and output are charged separately, not as one flat call-minute price. Text, visual context, thinking and search can add to the bill.
GPT-Realtime-2.1
OpenAI's realtime speech-to-speech reasoning model for tool-using voice agents that also need text and image context.
Best for
- Tool-using customer or employee voice agents
- Multimodal realtime assistants
- OpenAI-native agent stacks
Watch out for
There is no published universal latency number, and audio-token costs are hard to compare directly with minute- or character-priced competitors.
Compare the published facts
Gemini 3.8 Live vs GPT-Realtime-2.1
Values use each provider's own published units and limits. A blank means the provider did not publish a directly comparable value in the sources reviewed.
| Voice & realtime | Gemini 3.8 Live | GPT-Realtime-2.1 |
|---|---|---|
| Price basisToken-, character-, or minute-based price for the listed access route. | Audio $0.005/min in · $0.018/min out | Audio $32 in · $64 out / 1M tokens |
| Interaction modeSpeech-to-speech, audio-to-audio, or streamed text-to-speech behavior. | Speech-to-speech with visual input and interleaved reasoning | Speech-to-speech with text/image context |
| Published latencyProvider-published measurement with its stated exclusions; not a Cody test. | Not published | Not published |
| LanguagesProvider-documented language coverage or a clear unpublished marker. | 97 languages (Google launch claim) | Multilingual; exact list not published here |
| Tools & controlNative function calling, reasoning, or speech-control features. | Functions (async by default), search grounding | Function calling and configurable reasoning |
| Context or input limitDocumented token or character limit where it is meaningful. | 131,072 input · 65,536 output | 128K input · 32K max output |
How to choose
Compare the job, not the hype.
Start with the job you need to complete, then validate cost, access, and policy details on your exact provider route.
Gemini 3.8 Live
Google says paid Gemini API prompts and responses are not used to improve its products. Unpaid-service content generally may be used, with different treatment for EEA, UK, and Swiss users; check the current terms for your account and region.
Provider and API links
GPT-Realtime-2.1
OpenAI says API content is not used for training by default. Default abuse-monitoring logs may be retained up to 30 days, with additional controls available to qualifying organizations.
Provider and API links
Frequently asked questions
Gemini 3.8 Live vs GPT-Realtime-2.1 FAQ
What is the main difference between Gemini 3.8 Live and GPT-Realtime-2.1?
Gemini 3.8 Live: Google's real-time voice model for responsive conversations with audio, text and visual context. GPT-Realtime-2.1: OpenAI's realtime speech-to-speech reasoning model for tool-using voice agents that also need text and image context.
Should I choose Gemini 3.8 Live or GPT-Realtime-2.1?
Consider Gemini 3.8 Live when your priority is Conversational customer support. Consider GPT-Realtime-2.1 when your priority is Tool-using customer or employee voice agents. Test both with your own data and provider route before committing.
Is this Gemini 3.8 Live vs GPT-Realtime-2.1 comparison based on Cody benchmarks?
No. This comparison aligns provider-published facts for the Voice & realtime category. It does not claim a universal winner or combine incompatible third-party benchmark scores.