DeepSeek HarnessDeepSeek
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OpenAI Agents APIOpenAI
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Related Products
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About
DeepSeek Harness is an open source agent harness designed to keep AI agents working in real-world environments by helping them understand context, use tools, and continue operating across complex tasks. Built on the Cordis plugin system, every capability is a plugin that can be selected, swapped, extended, or recomposed through configuration without changing the core source code. Plugins provide models, tools, skills, sessions, sandboxes, storage, loops, scheduling, and the UI, while Cordis manages plugin mounting, dependencies, services, and events. Every run is traceable through an append-only session log that records system prompts, reasoning, tool calls and results, subagent scheduling, and context injections. The Trajectory view lets developers inspect these records by source, while resume, fork, search, and replay operate on the same event stream.
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About
The Agents API lets developers build and run cloud agents with the same harness and infrastructure that powers Codex, fully managed by OpenAI. A production-ready agent can be created with a single API call by specifying the task, model, tools, and environment, while OpenAI hosts and maintains the agent harness. Developers can choose where agents run: in an OpenAI-hosted sandbox, on their own infrastructure, or through supported sandbox partners. OpenAI-hosted sandboxes provide secure environments where agents can run code, work with files, use packages, skills, and plugins, and produce artifacts. The API is designed for long-running work, with automatic context compaction that preserves relevant information as sessions span multiple context windows. Tool search loads relevant tool definitions only when needed, while programmatic tool calling lets agents run calls in parallel, chain related operations, and filter or combine results in code.
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Platforms Supported
Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook
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Platforms Supported
Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook
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Audience
AI developers and agent-harness builders seeking to create, customize, trace, benchmark, and operate composable AI agents with interchangeable models, tools, skills, runtimes, and infrastructure
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Audience
Developers and AI teams seeking to build reliable, long-running cloud agents with managed context, tools, sandboxes, and multi-agent orchestration
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Support
Phone Support
24/7 Live Support
Online
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Support
Phone Support
24/7 Live Support
Online
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API
Offers API
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API
Offers API
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Screenshots and Videos |
Screenshots and Videos |
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Pricing
No information available.
Free Version
Free Trial
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Pricing
No information available.
Free Version
Free Trial
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Reviews/
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Reviews/
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Training
Documentation
Webinars
Live Online
In Person
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Training
Documentation
Webinars
Live Online
In Person
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Company InformationDeepSeek
Founded: 2023
China
deepseek.com/harness/en/
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Company InformationOpenAI
Founded: 2015
United States
openai.com/index/introducing-the-agents-api/
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Alternatives |
Alternatives |
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Categories |
Categories |
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Integrations
ChatGPT
ChatGPT Work
DeepSeek
DeepSeek -V4.1-Flash
DeepSeek-V4-Flash
DeepSeek-V4-Pro
GLM-5.3-Flash
OpenAI
OpenAI Codex
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Integrations
ChatGPT
ChatGPT Work
DeepSeek
DeepSeek -V4.1-Flash
DeepSeek-V4-Flash
DeepSeek-V4-Pro
GLM-5.3-Flash
OpenAI
OpenAI Codex
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