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OpenAI Agents API

OpenAI-hosted, managed Codex harness API for durable cloud agents with sessions, context compaction, subagents, and MCP connectivity.

Free accessNo free plan published
Paid fromAgents API (Public Beta)Sessions, context compaction, and recovery managed server-side; up to 4 parallel subagents

At a Glance

OpenAI Agents API is an AI tool for Agent & RAG frameworks (category: Development & Code). Free access: No free plan published. Documented: 1 plan with prices and limits.

Category
Agent & RAG frameworks
Paid from
contact sales / usage-based (Agents API (Public Beta))
Free Option
No free plan published
Plans
1
Sources
5 verified sources
Website
developers.openai.com (opens in a new tab)

Category: Development & Code · Agent & RAG frameworks

Features

The OpenAI Agents API is an OpenAI-hosted, managed version of the Codex harness for durable cloud agents: sessions, context compaction, recovery, and up to four subagents run server-side, while the application supplies tools and chooses the execution environment.

There is no separate harness fee. Model tokens and tools are billed at standard API rates, with an optional hosted sandbox at container rates from $0.03 to $1.92 per 20-minute session (1 to 64 GB). Public beta since September 10, 2026, US data residency only, no Zero Data Retention.

Prices and plans

TierPricePeriodWhat you get
Agents API (Public Beta)contact salesusage-basedSessions, context compaction, and recovery managed server-side; up to 4 parallel subagents
MCP connectivity over HTTP; tools billed at standard API rates
Optional hosted sandbox (hosted shell/code interpreter) at container rates: $0.03/$0.12/$0.48/$1.92 for 1/4/16/64 GB per 20-minute session, billed by the minute with a 5-minute minimum
US data residency only; no ZDR, even with a self-hosted sandbox

Prices per vendor, excl. taxes/VAT where applicable.

Limits

The Agents API manages sessions, context compaction, recovery, and up to four concurrent subagents server-side; the application supplies tools and chooses the execution environment. MCP servers connect over HTTP transport. Separate from the Agents SDK (in-app loop with full control over deployment, storage, and approvals) and from Codex/ChatGPT as an end-user product.

Alternatives and similar tools to OpenAI Agents API

A selection for “Agent & RAG frameworks” and curated direct comparisons. Direct comparisons carry the most weight, followed by the shared subcategory and shared tasks. Matching free-access types carry less weight. Ties are resolved consistently. No quality rating.

Cloudflare ClefDecision models on Workers AI: typed questions in, probabilities out. Not Typesafe Jev and not Cloudflare AI Search.Clef-flashAnthropic APIDeveloper API for Claude models with token-based billing, separate from Claude subscriptions.Claude Sonnet 5.5MonidDirectory and runtime for more than 1,700 agent tools, paid per call, usable through MCP, skill or CLI.Pay-per-callCharisma.aiBuild interactive conversational AI experiences for web, apps, games and training.ProfalGenerative media through an API plus serverless GPUs, billed by actual usage.Image modelsTypeSafe JevSystem One model Jev: typed decisions for software, not a chat assistant.Jev Early Access
2
2BA.AIEU-hosted, OpenAI-compatible coding-agent infrastructure with a flat request window. Not the OpenAI API alone.MonthlyHugging Face PROThe AI community platform with a hub for 2M+ models and 500K+ datasets, plus hosting for ML apps (Spaces).PRO

FAQ

Is OpenAI Agents API available for free?

No. No free access is published on the vendor's own pages.

How is OpenAI Agents API billed?

Public beta since September 10, 2026, header OpenAI-Beta: agents=v1. Container sessions are billed by the minute with a 5-minute minimum. US data residency only. No Zero Data Retention (ZDR), even with a self-hosted sandbox.

What plans does OpenAI Agents API offer?

The catalog documents one plan with price, billing period, and included features.

Is OpenAI Agents API currently available?

OpenAI Agents API is still active: Active.

How we compare

We compare free access, paid entry, plan limits, features and the listed official sources. Unsourced figures stay marked as not published.

Only confirmed entries appear in the catalog. Prices, plans and limits come from listed official vendor pages. Missing figures stay marked as not published. Search results are ordered by Task match by default; category and task lists are alphabetical. Both can be switched to Free access first; neither is a quality ranking. The vendor page always wins.

Edited and checked by the AI Compare Ninja team

Sources

All details regarding plans, limits, and features are based on official vendor documentation and the primary sources verified below.

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