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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. S1Fish AudioRemove
  2. GPT-6 Astra ProOpenAIRemove
  3. Claude Sonnet 5.5AnthropicRemove
  4. Gemini 3.5 TranscribeGoogleRemove

4 is the maximum. Remove one to add another.

s1 vs gpt-6-astra-pro vs claude-sonnet-5.5 vs gemini-3.5-transcribe
AttributeS1s1GPT-6 Astra Progpt-6-astra-proClaude Sonnet 5.5claude-sonnet-5.5Gemini 3.5 Transcribegemini-3.5-transcribe
Pricing
Input$0 / 1M$10.00 / 1M$2.00 / 1M$0 / 1M
Output$0 / 1M$50.00 / 1M$10.00 / 1M$0 / 1M
Cache Write (5m)Not applicable$10.00 / 1M$2.50 / 1MNot applicable
Cache Write (1h)Not applicable$10.00 / 1M$4.00 / 1MNot applicable
Cache ReadNot applicable$10.00 / 1M$0.20 / 1MNot applicable
Web Search$0 / 1M$0 / 1M$0 / 1M$0 / 1M
Context
Max contextN/A1M1M98.3K
Max outputN/AN/AN/AN/A
Capabilities
VisionNoYesYesYes
Function CallingNoYesYesYes
JSON ModeNoYesYesNo
StreamingNoYesYesNo
Catalogue
ProviderFish AudioOpenAIAnthropicGoogle
Categoryvoicechatchatvoice
Charge typePay As You GoPay As You GoPay As You GoPay As You Go
Released2026-07-29——2026-09-25
Description
SummaryFish Audio S1 text-to-speech. Billed per UTF-8 byte of input text.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.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.Google Gemini 3.5 Transcribe speech-to-text. Billed per input and output token.