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Apertis

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. S2.1 ProFish AudioRemove
  2. Claude Sonnet 5.5AnthropicRemove
  3. S1Fish AudioRemove
  4. Gemini 3.5 TranscribeGoogleRemove

4 is the maximum. Remove one to add another.

s2.1-pro vs claude-sonnet-5.5 vs s1 vs gemini-3.5-transcribe
AttributeS2.1 Pros2.1-proClaude Sonnet 5.5claude-sonnet-5.5S1s1Gemini 3.5 Transcribegemini-3.5-transcribe
Pricing
Input$0 / 1M$2.00 / 1M$0 / 1M$0 / 1M
Output$0 / 1M$10.00 / 1M$0 / 1M$0 / 1M
Cache Write (5m)Not applicable$2.50 / 1MNot applicableNot applicable
Cache Write (1h)Not applicable$4.00 / 1MNot applicableNot applicable
Cache ReadNot applicable$0.20 / 1MNot applicableNot applicable
Web Search$0 / 1M$0 / 1M$0 / 1M$0 / 1M
Context
Max contextN/A1MN/A98.3K
Max outputN/AN/AN/AN/A
Capabilities
VisionNoYesNoYes
Function CallingNoYesNoYes
JSON ModeNoYesNoNo
StreamingNoYesNoNo
Catalogue
ProviderFish AudioAnthropicFish AudioGoogle
Categoryvoicechatvoicevoice
Charge typePay As You GoPay As You GoPay As You GoPay As You Go
Released2026-07-29—2026-07-292026-09-25
Description
SummaryFish Audio S2.1 Pro text-to-speech. Billed per UTF-8 byte of input text.Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, serving as a direct upgrade to Sonnet 5. It excels at feature development, bug fixing, and creating polished documents, presentations, and spreadsheets, while offering clearer writing and communication than its predecessor.Fish Audio S1 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.