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Put up to 4 models beside each other — token prices, context windows, capabilities and provider, from the same catalogue the model pages read.

  1. Gemini 3.1 Flash TTS PreviewGoogleRemove
  2. Kimi K3.1 ProMoonShot AIRemove
gemini-3.1-flash-tts-preview vs kimi-k3.1-pro
AttributeGemini 3.1 Flash TTS Previewgemini-3.1-flash-tts-previewKimi K3.1 Prokimi-k3.1-pro
Pricing
Input$27.50 / 1M$2.00 / 1M
Output— Not priced per output token$10.00 / 1M
Cache Write (5m)Not applicable$2.00 / 1M
Cache Write (1h)Not applicable$2.00 / 1M
Cache ReadNot applicable$2.00 / 1M
Web Search$0 / 1M$0 / 1M
Context
Max context8.2K1M
Max outputN/AN/A
Capabilities
VisionNoYes
Function CallingNoYes
JSON ModeYesYes
StreamingNoYes
Catalogue
ProviderGoogleMoonShot AI
Categoryvoicechat
Charge typePay As You GoPay As You Go
Released——
Description
SummaryGemini 3.1 Flash TTS Preview is Google's next-generation text-to-speech model, delivering a major upgrade over Gemini 2.5 Flash TTS. It converts text into natural audio across 70+ languages, with significantly expanded language coverage and improved quality. The model introduces 200+ inline audio control tags (e.g., [whispers], [laughs], [excited]) for fine-grained control over emotion, tone, and pacing, along with support for two speakers with independent voice and style settings. It outputs 24 kHz / 16-bit PCM audio, includes SynthID watermarking, and supports a 32K token context window. Designed for expressive and controllable voice generation, it is well suited for dialogue systems, storytelling, character-driven content, and advanced audio production workflows.Kimi K3.1 Pro is Moonshot AI's flagship open-weight multimodal reasoning model, building on Kimi K3 with enhanced post-training for advanced reasoning and autonomous task execution. It features a 1M-token context window and native image and video understanding, enabling complex, long-context multimodal workflows. Optimized for long-horizon coding, 3D creation, financial research, and end-to-end agentic knowledge work, Kimi K3.1 Pro is well suited for autonomous software engineering, multimodal analysis, and complex professional workflows that require sustained reasoning and reliable execution.