Nano Banana 2 (Gemini 3.1 Flash Image) vs Grok Speech (STT + TTS APIs)
Which one should you pick? Here's the full breakdown.
Nano Banana 2 (Gemini 3.1 Flash Image)
Google's Gemini 3.1 Flash Image model -- the best-in-class text-in-image renderer, now the default across the Gemini app
Grok Speech (STT + TTS APIs)
xAI's standalone voice APIs -- launched 2026-04-17. Built on the stack that powers Grok Voice, Tesla vehicles, and Starlink customer support. $0.10/hr STT batch, $4.20 per 1M characters TTS, 25+ languages, word-level timestamps + speaker diarization
| Category | Nano Banana 2 (Gemini 3.1 Flash Image) | Grok Speech (STT + TTS APIs) |
|---|---|---|
| Ease of Use | 9.5 | 7.0 |
| Output Quality | 9.5 | 8.5 |
| Value | 8.5 | 9.0 |
| Features | 8.0 | 8.0 |
| Overall | 8.9 | 8.1 |
Pricing Comparison
| Feature | Nano Banana 2 (Gemini 3.1 Flash Image) | Grok Speech (STT + TTS APIs) |
|---|---|---|
| Free Tier | Yes | No |
| Starting Price | $0 | $0.10 |
Which Should You Pick?
Pick Nano Banana 2 (Gemini 3.1 Flash Image) if...
- ✓Higher output quality (9.5 vs 8.5)
- ✓Easier to use (9.5 vs 7)
- ✓Has a free tier
Designers, marketers, and content creators who need readable text in images (social posts, ad creative, book covers, infographics, event flyers) and who are already using or willing to pay for Gemini. If any part of your commercial design work requires typography to look right, Nano Banana 2 is the 2026 leader.
Visit Nano Banana 2 (Gemini 3.1 Flash Image)Pick Grok Speech (STT + TTS APIs) if...
Developers building voice agents, real-time transcription tools, accessibility features, or high-volume TTS workloads where the cost per hour of audio actually matters at scale. Strong fit for phone-call and meeting transcription use cases where xAI's published WER advantage (5.0% on phone-call entities vs. ElevenLabs 12.0%) compounds quickly.
Visit Grok Speech (STT + TTS APIs)Our Verdict
Nano Banana 2 (Gemini 3.1 Flash Image) edges out Grok Speech (STT + TTS APIs) with a 8.9 vs 8.1 overall score. Both are solid picks, but Nano Banana 2 (Gemini 3.1 Flash Image) has the advantage in output quality.