GPT-5.6 Sol

GPT-5.6 Sol

OpenAI
5.0 out of 5 stars
Inkling 2 Small

Inkling 2 Small

Thinking Machines Lab
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+

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About

GPT-5.6 Sol is a next-generation OpenAI model designed for advanced reasoning, coding, agentic workflows, biology analysis, cybersecurity support, and complex knowledge work. It is part of the GPT-5.6 model family alongside Terra and Luna, with Sol positioned as the flagship model for the most demanding tasks. The model introduces a new max reasoning effort for deeper thinking and an ultra mode that uses subagents to accelerate complex work beyond a single-agent approach. GPT-5.6 Sol shows strong performance in command-line coding workflows, long-horizon security tasks, genomics analysis, vulnerability research, debugging, patch development, and defensive testing. OpenAI pairs the model’s stronger capabilities with layered safeguards, real-time misuse classifiers, account-level review, automated red-teaming, and enterprise controls for sensitive workflows. GPT-5.6 Sol helps developers, enterprises, researchers, and security teams complete sophisticated technical work.

About

Inkling 2 Small is a multimodal AI model developed by Thinking Machines Lab for advanced reasoning, autonomous software engineering, visual understanding, and AI agent development. The model uses a mixture-of-experts architecture with 594 billion total parameters and 17 billion active parameters to balance intelligence and computational efficiency. It supports text and image inputs, a context window of up to one million tokens, and configurable reasoning effort for tasks requiring different levels of analysis. Its agentic capabilities enable autonomous code generation, debugging, website development, scientific research, and complex multistep workflows involving external tools. Inkling 2 Small also supports fine-tuning and reinforcement learning through Thinking Machines Lab's Tinker platform, allowing developers to customize the model for specialized applications.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

GPT-5.6 Sol is best suited for developers, enterprise teams, AI engineers, researchers, security teams, cyber defenders, software organizations, biotechnology teams, and advanced technical users that need frontier reasoning, coding support, agentic workflows, biology analysis, defensive cybersecurity assistance, API access, Codex integration, and stronger safety controls

Audience

AI developers, machine learning engineers, software developers, autonomous agent researchers, data scientists, AI research laboratories, DevOps professionals, computational scientists, enterprise AI teams, and organizations seeking multimodal language models, long-context reasoning, AI coding agents, reinforcement learning, model fine-tuning, visual understanding, and autonomous research capabilities

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Supported

API

Offers API Supported

Screenshots and Videos

Screenshots and Videos

Pricing

$4 per 1M tokens (input)
$4 input / $20 output per 1M tokens
Free Version Not Supported
Free Trial Not Supported

Pricing

$0.30 per million input tokens
$0.30 per million input tokens, $0.03 per million cached input tokens, and $1.00 per million output tokens
Free Version Not Supported
Free Trial Not Supported

Reviews/Ratings

Overall 5.0 / 5
ease 5.0 / 5
features 5.0 / 5
design 5.0 / 5
support 5.0 / 5

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

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Pros & Cons from Real Users

Pros

  • GPT-5.6 Sol feels like the model I would reach for when the task is actually hard. As a developer, I like that it is built for deeper reasoning, coding, long-horizon planning, and agentic workflows instead of just quick prompt-and-response work. It is especially appealing for complex debugging, multi-step code changes, research-heavy engineering tasks, and agents that need to coordinate tools without losing the plot. The fact that OpenAI is positioning Sol as the most capable model in the GPT-5.6 family makes sense, because this is the one I would want for serious engineering work.

Cons

  • The main downside is that Sol is the premium option, so I would not use it for every single task. OpenAI lists Sol at a higher token price than Terra or Luna, which means developers will still need to be smart about routing simple jobs to cheaper models.

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

OpenAI
Founded: 2015
United States
openai.com

Company Information

Thinking Machines Lab
Founded: 2025
United States
thinkingmachines.ai/

Alternatives

GPT-6.1 Terra

GPT-6.1 Terra

OpenAI
5.0 out of 5 stars

Alternatives

GPT-6 Luna

GPT-6 Luna

OpenAI
5.0 out of 5 stars
GPT-6.1 Sol

GPT-6.1 Sol

OpenAI
5.0 out of 5 stars
Gemini 4 Argon

Gemini 4 Argon

Google
5.0 out of 5 stars
Kimi K3.1 Pro

Kimi K3.1 Pro

Moonshot AI
5.0 out of 5 stars
GPT-5.6 Terra

GPT-5.6 Terra

OpenAI
5.0 out of 5 stars
Inkling-Small

Inkling-Small

Thinking Machines Lab
5.0 out of 5 stars
GPT-5.6 Luna

GPT-5.6 Luna

OpenAI
5.0 out of 5 stars
Inkling

Inkling

Thinking Machines Lab

Categories

AI Coding Models Supported
AI Models Supported
AI Vision Models Supported

Categories

Integrations

App0 Supported
C++ Supported
ChatGPT Supported
ChatGPT Enterprise Supported
ChatGPT Pro Supported
GitHub Copilot Supported
Google Drive Supported
Hermes Agent Supported
Kineto by JetBrains Supported
Kotlin Supported
Microsoft 365 Supported
Model Context Protocol (MCP) Not Supported
Muse Supported
NextDocs Supported
OpenTag Supported
Perplexity Pro Supported
SimpleClaw Supported
Springhub Supported
Visual Studio Code Supported
XML Supported

Integrations

App0 Not Supported
C++ Not Supported
ChatGPT Not Supported
ChatGPT Enterprise Not Supported
ChatGPT Pro Not Supported
GitHub Copilot Not Supported
Google Drive Not Supported
Hermes Agent Not Supported
Kineto by JetBrains Not Supported
Kotlin Not Supported
Microsoft 365 Not Supported
Model Context Protocol (MCP) Supported
Muse Not Supported
NextDocs Not Supported
OpenTag Not Supported
Perplexity Pro Not Supported
SimpleClaw Not Supported
Springhub Not Supported
Visual Studio Code Not Supported
XML Not Supported
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Claim GPT-5.6 Sol and update features and information
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