Grok Speech (STT + TTS APIs) vs Nano Banana 2 (Gemini 3.1 Flash Image)

Nano Banana 2 (Gemini 3.1 Flash Image) edges out Grok Speech (STT + TTS APIs) by 0.8 points (8.9 vs 8.1) -- a A-tier vs A-tier split that's narrow but real. Not a blowout; both belong on a shortlist. The score gap shows up most clearly in the categories that matter for Nano Banana 2 (Gemini 3.1 Flash Image)'s strengths, so if those categories are your priority, the lead translates.

On pricing, Nano Banana 2 (Gemini 3.1 Flash Image) starts free while Grok Speech (STT + TTS APIs) requires a paid plan from day one ($0.10+). If you're testing the waters or running an occasional workload, that gap matters more than the score differential. Grok Speech (STT + TTS APIs) starts at $0.10; Nano Banana 2 (Gemini 3.1 Flash Image) starts at $0. Compare what each entry tier actually unlocks before you compare list prices -- the limits matter more than the headline number.

By use case: pick Grok Speech (STT + TTS APIs) when 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. Pick Nano Banana 2 (Gemini 3.1 Flash Image) when 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. The two tools aren't fighting for the same person -- they're aiming at adjacent jobs that occasionally overlap. If you're squarely in Nano Banana 2 (Gemini 3.1 Flash Image)'s lane, the tier-list ranking and the use-case fit point the same direction; if you're in Grok Speech (STT + TTS APIs)'s lane, the score gap matters less than the fit.

Bottom line: Nano Banana 2 (Gemini 3.1 Flash Image) is the safer default for most readers, but Grok Speech (STT + TTS APIs) is competitive enough that the tie-breaker is your specific workload, not the spec sheet.