Gemini 3.8 Flash TTS vs GPT-6 Luna
A direct, empirical evaluation of Gemini 3.8 Flash TTS (Google DeepMind) against GPT-6 Luna (OpenAI).
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.
GPT-6 Luna
Developed by OpenAI · Proprietary High-Throughput Distillation parameters
High-throughput document extraction, sub-second routing, customer service triage, code autocomplete, and cost-optimized reasoning via Luna Pro mode.
| Metric | Gemini 3.8 Flash TTS | GPT-6 Luna |
|---|---|---|
| SWE-bench Verified | 64.2% | 48.2% |
| MMLU-Pro | 88.5% | 74.6% |
| MATH-500 | 91% | 84.1% |
| Context Window | 128,000 characters input dialogue script | 1,050,000 tokens |
| Input Pricing (per 1M) | $0.15 | $0.10 |
| Output Pricing (per 1M) | $15.00 | $0.50 |