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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. Muse Spark OpenMetaRemove
  4. Claude Fable 5.2AnthropicRemove

4 is the maximum. Remove one to add another.

s2.1-pro vs gpt-6.1-terra vs muse-spark-open vs claude-fable-5.2
AttributeS2.1 Pros2.1-proGPT-6.1 Terragpt-6.1-terraMuse Spark Openmuse-spark-openClaude Fable 5.2claude-fable-5.2
Pricing
Input— Not priced per input token$1.00 / 1M$1.25 / 1M$8.00 / 1M
Output— Not priced per output token$5.00 / 1M$4.25 / 1M$40.00 / 1M
Cache Write (5m)Not applicable$1.00 / 1M$1.25 / 1M$10.00 / 1M
Cache Write (1h)Not applicable$1.00 / 1M$1.25 / 1M$16.00 / 1M
Cache ReadNot applicable$1.00 / 1M$1.25 / 1M$0.20 / 1M
Web Search$0 / 1M$0 / 1M$0 / 1M$0 / 1M
Context
Max contextN/A1M1M1M
Max outputN/AN/AN/AN/A
Capabilities
VisionNoYesYesYes
Function CallingNoYesYesYes
JSON ModeNoYesYesYes
StreamingNoNoYesYes
Catalogue
ProviderFish AudioOpenAIMetaAnthropic
Categoryvoicechatchatchat
Charge typePay As You GoPay 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.Muse Spark Open is an open-weight, coding-optimized model designed for agentic software engineering workflows. It delivers strong first-attempt accuracy, reliable tool calling, and deep codebase understanding, enabling effective development across real-world repositories. Optimized for autonomous coding agents, complex code navigation, and tool-driven development, Muse Spark Open is well suited for software engineering automation, debugging, code generation, and multi-step coding workflows where accuracy and reliable execution are essential.Claude Fable 5.2 is Anthropic's most capable model for advanced technical work and open-ended problem solving, delivering significant improvements in coding, reasoning, and vision over Fable 5.1. It excels at exceptionally complex tasks, including large-scale software migrations, electronic system design, and advanced scientific and mathematical research. With up to 30% faster output generation, clearer communication, and always-on adaptive extended thinking, Fable 5.2 supports configurable reasoning effort from low to max (default high), with thinking preserved across turns. Designed for frontier engineering, scientific discovery, and ambitious long-horizon agentic workflows, it complements Opus 5.5 as a specialized option for the most demanding technical challenges.