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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. S1Fish AudioRemove
  2. S2.1 ProFish AudioRemove
  3. GPT-6 Luna ProOpenAIRemove
  4. Gemini 3.5 TranscribeGoogleRemove

4 is the maximum. Remove one to add another.

s1 vs s2.1-pro vs gpt-6-luna-pro vs gemini-3.5-transcribe
AttributeS1s1S2.1 Pros2.1-proGPT-6 Luna Progpt-6-luna-proGemini 3.5 Transcribegemini-3.5-transcribe
Pricing
Input$0 / 1M$0 / 1M$0.10 / 1M$0 / 1M
Output$0 / 1M$0 / 1M$0.50 / 1M$0 / 1M
Cache Write (5m)Not applicableNot applicable$0.10 / 1MNot applicable
Cache Write (1h)Not applicableNot applicable$0.10 / 1MNot applicable
Cache ReadNot applicableNot applicable$0.10 / 1MNot applicable
Web Search$0 / 1M$0 / 1M$0 / 1M$0 / 1M
Context
Max contextN/AN/A1.1M98.3K
Max outputN/AN/AN/AN/A
Capabilities
VisionNoNoYesYes
Function CallingNoNoYesYes
JSON ModeNoNoYesNo
StreamingNoNoYesNo
Catalogue
ProviderFish AudioFish AudioOpenAIGoogle
Categoryvoicevoicechatvoice
Charge typePay As You GoPay As You GoPay As You GoPay As You Go
Released2026-07-292026-07-29—2026-09-25
Description
SummaryFish Audio S1 text-to-speech. Billed per UTF-8 byte of input text.Fish Audio S2.1 Pro text-to-speech. Billed per UTF-8 byte of input text.GPT-6 Luna Pro uses the same underlying model as GPT-6 Luna, but runs with reasoning.mode set to pro for higher-quality responses on complex tasks. It combines Luna's speed and cost efficiency with deeper reasoning and more reliable multi-step execution, making it well suited for advanced coding, computer use, and agentic workflows where higher solution quality is needed without moving to a larger GPT-6 tier.Google Gemini 3.5 Transcribe speech-to-text. Billed per input and output token.