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Compare models

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

  1. Aura-2DeepgramRemove
  2. Gemini 3.5 TranscribeGoogleRemove
  3. S2 ProFish AudioRemove
  4. GPT-6 LunaOpenAIRemove

4 is the maximum. Remove one to add another.

aura-2 vs gemini-3.5-transcribe vs s2-pro vs gpt-6-luna
AttributeAura-2aura-2Gemini 3.5 Transcribegemini-3.5-transcribeS2 Pros2-proGPT-6 Lunagpt-6-luna
Pricing
Input$0 / 1M$0 / 1M$0 / 1M$0.10 / 1M
Output$0 / 1M$0 / 1M$0 / 1M$0.50 / 1M
Cache Write (5m)Not applicableNot applicableNot applicable$0.10 / 1M
Cache Write (1h)Not applicableNot applicableNot applicable$0.10 / 1M
Cache ReadNot applicableNot applicableNot applicable$0.10 / 1M
Web Search$0 / 1M$0 / 1M$0 / 1M$0 / 1M
Context
Max contextN/A98.3KN/A1.1M
Max outputN/AN/AN/AN/A
Capabilities
VisionNoYesNoYes
Function CallingNoYesNoYes
JSON ModeNoNoNoYes
StreamingNoNoNoYes
Catalogue
ProviderDeepgramGoogleFish AudioOpenAI
Categoryvoicevoicevoicechat
Charge typePay As You GoPay As You GoPay As You GoPay As You Go
Released2026-07-162026-09-252026-07-29—
Description
SummaryDeepgram Aura-2 text-to-speech for real-time voice applications. Billed per input character.Google Gemini 3.5 Transcribe speech-to-text. Billed per input and output token.Fish Audio S2 Pro text-to-speech. Billed per UTF-8 byte of input text.GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, optimized for high-volume and latency-sensitive workloads such as chat, classification, and lightweight agentic tasks. It combines low-cost, responsive inference with the GPT-6 family’s improvements in factual reliability and clear, concise communication. At higher reasoning effort, GPT-6 Luna can also handle complex software engineering and computer-use workflows that previously required a Sol-tier model, making it a versatile choice for scalable production applications that need to balance speed, cost, and capability.