Gemini 3.8 Flash TTS vs Gemini 4 Carbon
A direct, empirical evaluation of Gemini 3.8 Flash TTS (Google DeepMind) against Gemini 4 Carbon (Google DeepMind).
Gemini 3.8 Flash TTS
Developed by Google DeepMind · Proprietary Multimodal Acoustic Flow Matching Transformer parameters
High-fidelity expressive podcasts, interactive video game dialogues, scripted multi-speaker conversations, and prompt-designed custom character voices.
Gemini 4 Carbon
Developed by Google DeepMind · Carbon-Aware Frontier Transformer on TPU v6e parameters
Sub-watt green computing, 62% energy reduction per million tokens, carbon-aware datagrid routing, and eco-tier batch execution discounts.
| Metric | Gemini 3.8 Flash TTS | Gemini 4 Carbon |
|---|---|---|
| SWE-bench Verified | 64.2% | 69.2% |
| MMLU-Pro | 88.5% | 84.6% |
| MATH-500 | 91% | 91.4% |
| Context Window | 128,000 characters input dialogue script | 1,000,000 tokens |
| Input Pricing (per 1M) | $0.15 | $0.80 |
| Output Pricing (per 1M) | $15.00 | $2.40 |