Gemini 2.5 Flash Native AudiovsGPT-Realtime-2.1 Mini
Both realtime voice models, compared at each maker’s own API list prices. Every figure links to its source.
Key differences
Context
131,072 Gemini 2.5 Flash live preview | Gemini API | Google AI for Developers · as of Nov 1, 2026
128,000 GPT-Realtime-2.1 Mini · as of Nov 1, 2026
Input modalities
Text, Audio, Video Gemini 2.5 Flash live preview | Gemini API | Google AI for Developers · as of Nov 1, 2026
Text, Image, Audio GPT-Realtime-2.1 Mini · as of Nov 1, 2026
InputMaker’s official API · global · USD · Text tokens
$0.50 / 1M tokens Gemini API pricing · as of Nov 1, 2026
$0.60 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
InputMaker’s official API · global · USD · Audio tokens
$3.00 / 1M tokens Gemini API pricing · as of Nov 1, 2026
$10.00 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
OutputMaker’s official API · global · USD · Text tokens
$2.00 / 1M tokens Gemini API pricing · as of Nov 1, 2026
$2.40 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
OutputMaker’s official API · global · USD · Audio tokens
$12.00 / 1M tokens Gemini API pricing · as of Nov 1, 2026
$20.00 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
These differences use verified vendor specifications or each maker’s official API on the same region, currency, meter and billing conditions. Different conditions remain side by side in the full table; they do not establish which model is cheaper. Declared features describe support, not measured quality or a recommendation. Missing evidence does not mean a feature is unsupported.
Full comparison
| Gemini 2.5 Flash Native Audio Google | GPT-Realtime-2.1 Mini OpenAI | |
|---|---|---|
| Overview | ||
| Released | Dec 12, 2025 | Jul 6, 2026 |
| Knowledge cutoff | Jan 2025 | Sep 2024 |
| Specs | ||
| Context | 131.07K | 128K |
| Max output | 8.19K | 32K |
| Input modalities | Text, Audio, Video | Text, Image, Audio |
| Output modalities | Text, Audio | Text, Audio |
| Reasoning | ||
| Tool use | ||
| Structured output | — | — |
| Pricing | ||
| Audio input price | $3.00Audio tokens | $10.00Audio tokens |
| Audio output price | $12.00Audio tokens | $20.00Audio tokens |
| Input price | $0.50 | $0.60 |
| Output price | $2.00 | $2.40 |
| Cache read price | — | $0.060 |
Headline prices may come from different channels, regions or tiers. Check each source before choosing a model; missing facts stay blank.
Model details and sources
- Gemini 2.5 Flash Native Audio → Available
- GPT-Realtime-2.1 Mini → Available