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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. Transcribe 1 ProFish AudioRemove
  3. S2.1 ProFish AudioRemove
  4. GPT-6 Luna ProOpenAIRemove

4 is the maximum. Remove one to add another.

s1 vs transcribe-1-pro vs s2.1-pro vs gpt-6-luna-pro
AttributeS1s1Transcribe 1 Protranscribe-1-proS2.1 Pros2.1-proGPT-6 Luna Progpt-6-luna-pro
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/AN/AN/A1.1M
Max outputN/AN/AN/AN/A
Capabilities
VisionNoNoNoYes
Function CallingNoNoNoYes
JSON ModeNoNoNoYes
StreamingNoNoNoYes
Catalogue
ProviderFish AudioFish AudioFish AudioOpenAI
Categoryvoicevoicevoicechat
Charge typePay As You GoPay As You GoPay As You GoPay As You Go
Released2026-07-292026-09-242026-07-29—
Description
SummaryFish Audio S1 text-to-speech. Billed per UTF-8 byte of input text.Fish Audio Transcribe 1 Pro speech-to-text with speaker labels; transcripts include speaker tags such as <|speaker:0|>. Billed per second of audio.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.