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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 ProFish AudioRemove
  3. Gemini 3.5 TranscribeGoogleRemove
  4. GPT-6 Astra ProOpenAIRemove

4 is the maximum. Remove one to add another.

s1 vs s2-pro vs gemini-3.5-transcribe vs gpt-6-astra-pro
AttributeS1s1S2 Pros2-proGemini 3.5 Transcribegemini-3.5-transcribeGPT-6 Astra Progpt-6-astra-pro
Pricing
Input$0 / 1M$0 / 1M$0 / 1M$10.00 / 1M
Output$0 / 1M$0 / 1M$0 / 1M$50.00 / 1M
Cache Write (5m)Not applicableNot applicableNot applicable$10.00 / 1M
Cache Write (1h)Not applicableNot applicableNot applicable$10.00 / 1M
Cache ReadNot applicableNot applicableNot applicable$10.00 / 1M
Web Search$0 / 1M$0 / 1M$0 / 1M$0 / 1M
Context
Max contextN/AN/A98.3K1M
Max outputN/AN/AN/AN/A
Capabilities
VisionNoNoYesYes
Function CallingNoNoYesYes
JSON ModeNoNoNoYes
StreamingNoNoNoYes
Catalogue
ProviderFish AudioFish AudioGoogleOpenAI
Categoryvoicevoicevoicechat
Charge typePay As You GoPay As You GoPay As You GoPay As You Go
Released2026-07-292026-07-292026-09-25—
Description
SummaryFish Audio S1 text-to-speech. Billed per UTF-8 byte of input text.Fish Audio S2 Pro text-to-speech. Billed per UTF-8 byte of input text.Google Gemini 3.5 Transcribe speech-to-text. Billed per input and output token.GPT-6 Astra Pro uses the same underlying model as GPT-6 Astra, but runs with reasoning.mode set to pro for higher-quality responses on complex tasks. Optimized for deeper reasoning, greater accuracy, and more reliable multi-step execution, it is well suited for demanding coding, analysis, and agentic workflows where solution quality takes priority over speed and cost.