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.

GPT-6.1 TerraOpenAI Remove
Claude Fable 5.2Anthropic Remove
Kimi K3.1 ProMoonShot AI Remove
S2 ProFish Audio Remove

4 is the maximum. Remove one to add another.

gpt-6.1-terra vs claude-fable-5.2 vs kimi-k3.1-pro vs s2-pro
Attribute	GPT-6.1 Terragpt-6.1-terra	Claude Fable 5.2claude-fable-5.2	Kimi K3.1 Prokimi-k3.1-pro	S2 Pros2-pro
Pricing
Input	$1.00 / 1M	$8.00 / 1M	$2.00 / 1M	— Not priced per input token
Output	$5.00 / 1M	$40.00 / 1M	$10.00 / 1M	— Not priced per output token
Cache Write (5m)	$1.00 / 1M	$10.00 / 1M	$2.00 / 1M	Not applicable
Cache Write (1h)	$1.00 / 1M	$16.00 / 1M	$2.00 / 1M	Not applicable
Cache Read	$1.00 / 1M	$0.20 / 1M	$2.00 / 1M	Not applicable
Web Search	$0 / 1M	$0 / 1M	$0 / 1M	$0 / 1M
Context
Max context	1M	1M	1M	N/A
Max output	N/A	N/A	N/A	N/A
Capabilities
Vision	Yes	Yes	Yes	No
Function Calling	Yes	Yes	Yes	No
JSON Mode	Yes	Yes	Yes	No
Streaming	No	Yes	Yes	No
Catalogue
Provider	OpenAI	Anthropic	MoonShot AI	Fish Audio
Category	chat	chat	chat	voice
Charge type	Pay As You Go	Pay As You Go	Pay As You Go	Pay As You Go
Released	—	—	—	2026-07-29
Description
Summary	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.	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.	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.	Fish Audio S2 Pro text-to-speech. Billed per UTF-8 byte of input text.