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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. S2.1 ProFish AudioRemove
  2. GPT-6.1 TerraOpenAIRemove
  3. Kimi K3.1 ProMoonShot AIRemove
s2.1-pro vs gpt-6.1-terra vs kimi-k3.1-pro
AttributeS2.1 Pros2.1-proGPT-6.1 Terragpt-6.1-terraKimi K3.1 Prokimi-k3.1-pro
Pricing
Input— Not priced per input token$1.00 / 1M$2.00 / 1M
Output— Not priced per output token$5.00 / 1M$10.00 / 1M
Cache Write (5m)Not applicable$1.00 / 1M$2.00 / 1M
Cache Write (1h)Not applicable$1.00 / 1M$2.00 / 1M
Cache ReadNot applicable$1.00 / 1M$2.00 / 1M
Web Search$0 / 1M$0 / 1M$0 / 1M
Context
Max contextN/A1M1M
Max outputN/AN/AN/A
Capabilities
VisionNoYesYes
Function CallingNoYesYes
JSON ModeNoYesYes
StreamingNoNoYes
Catalogue
ProviderFish AudioOpenAIMoonShot AI
Categoryvoicechatchat
Charge typePay As You GoPay As You GoPay As You Go
Released2026-07-29——
Description
SummaryFish Audio S2.1 Pro text-to-speech. Billed per UTF-8 byte of input text.GPT-6.1 Terra is OpenAI’s mid-tier model in the GPT-6.1 series, designed to balance capability, speed, and cost efficiency. Positioned below GPT-6.1 Sol, it delivers strong performance across everyday agentic workflows, coding, and professional writing, with particular strengths in screenshot understanding and on-screen content analysis. Optimized for high-volume production workloads, GPT-6.1 Terra is well suited for coding assistants, visual interface analysis, workflow automation, and scalable agentic applications that require reliable performance at an accessible cost.Kimi K3.1 Pro is Moonshot AI's flagship open-weight multimodal reasoning model, building on Kimi K3 with enhanced post-training for advanced reasoning and autonomous task execution. It features a 1M-token context window and native image and video understanding, enabling complex, long-context multimodal workflows. Optimized for long-horizon coding, 3D creation, financial research, and end-to-end agentic knowledge work, Kimi K3.1 Pro is well suited for autonomous software engineering, multimodal analysis, and complex professional workflows that require sustained reasoning and reliable execution.