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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. Universal-3.5 ProAssemblyAIRemove
  2. GPT-6 Luna ProOpenAIRemove
  3. S1Fish AudioRemove
  4. Perceptron Mk1.5PerceptronRemove

4 is the maximum. Remove one to add another.

universal-3-5-pro vs gpt-6-luna-pro vs s1 vs perceptron-mk1.5
AttributeUniversal-3.5 Prouniversal-3-5-proGPT-6 Luna Progpt-6-luna-proS1s1Perceptron Mk1.5perceptron-mk1.5
Pricing
Input$0 / 1M$0.10 / 1M$0 / 1M$0.15 / 1M
Output$0 / 1M$0.50 / 1M$0 / 1M$1.50 / 1M
Cache Write (5m)Not applicable$0.10 / 1MNot applicable$0.15 / 1M
Cache Write (1h)Not applicable$0.10 / 1MNot applicable$0.15 / 1M
Cache ReadNot applicable$0.10 / 1MNot applicable$0.15 / 1M
Web Search$0 / 1M$0 / 1M$0 / 1M$0 / 1M
Context
Max contextN/A1.1MN/A36.9K
Max outputN/AN/AN/AN/A
Capabilities
VisionNoYesNoNo
Function CallingNoYesNoNo
JSON ModeNoYesNoNo
StreamingNoYesNoYes
Catalogue
ProviderAssemblyAIOpenAIFish AudioPerceptron
Categoryvoicechatvoicechat
Charge typePay As You GoPay As You GoPay As You GoPay As You Go
Released2026-09-22—2026-07-292026-09-25
Description
SummaryAssemblyAI Universal-3.5 Pro speech-to-text. Billed per second of audio.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.Fish Audio S1 text-to-speech. Billed per UTF-8 byte of input text.Perceptron Mk1.5 chat model that accepts audio input. Audio and text input are billed per token.