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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. GPT-6 Astra ProOpenAIRemove
  2. S1Fish AudioRemove
  3. S2 ProFish AudioRemove
  4. Universal-3.5 ProAssemblyAIRemove

4 is the maximum. Remove one to add another.

gpt-6-astra-pro vs s1 vs s2-pro vs universal-3-5-pro
AttributeGPT-6 Astra Progpt-6-astra-proS1s1S2 Pros2-proUniversal-3.5 Prouniversal-3-5-pro
Pricing
Input$10.00 / 1M$0 / 1M$0 / 1M$0 / 1M
Output$50.00 / 1M$0 / 1M$0 / 1M$0 / 1M
Cache Write (5m)$10.00 / 1MNot applicableNot applicableNot applicable
Cache Write (1h)$10.00 / 1MNot applicableNot applicableNot applicable
Cache Read$10.00 / 1MNot applicableNot applicableNot applicable
Web Search$0 / 1M$0 / 1M$0 / 1M$0 / 1M
Context
Max context1MN/AN/AN/A
Max outputN/AN/AN/AN/A
Capabilities
VisionYesNoNoNo
Function CallingYesNoNoNo
JSON ModeYesNoNoNo
StreamingYesNoNoNo
Catalogue
ProviderOpenAIFish AudioFish AudioAssemblyAI
Categorychatvoicevoicevoice
Charge typePay As You GoPay As You GoPay As You GoPay As You Go
Released—2026-07-292026-07-292026-09-22
Description
SummaryGPT-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.Fish 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.AssemblyAI Universal-3.5 Pro speech-to-text. Billed per second of audio.