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OpenAI API

OpenAI's general developer API for text, agents, realtime voice, embeddings and more, billed usage-based per token.

Free accessNo free plan published
Paid fromOpenAI APIAccess to the GPT-6 flagship family (Astra, Sol, Luna) and the GPT-5.6 family (Sol/Terra/Luna), Agents SDK, Responses API

At a Glance

OpenAI 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
$10 / $50 / per 1M input/output tokens (OpenAI API)
Free Option
No free plan published
Plans
1
Sources
13 verified sources
Website
platform.openai.com (opens in a new tab)

Category: Development & Code · Agent & RAG frameworks

Features

The OpenAI API offers models for text, code, images and audio, plus tools for search, file analysis and agent workflows. Billing depends on the model and usage; tool and storage charges can be added. ChatGPT subscriptions and API billing are separate.

Prices and plans

TierPricePeriodWhat you get
OpenAI API$10 / $50Standard up to 272,000 input tokens. Above that: USD 20 input and USD 75 output per million tokens for the entire request. Other processing tiers and extra tools can incur different costs.per 1M input/output tokensAccess to the GPT-6 flagship family (Astra, Sol, Luna) and the GPT-5.6 family (Sol/Terra/Luna), Agents SDK, Responses API
GPT-6 standard short context per 1M tokens (USD): Astra $10/$50, Sol $2/$10, Luna $0.10/$0.50. Cached: Astra $1, Sol $0.20, Luna $0.01. Long context: Astra $20/$75, Sol $4/$15, Luna $0.20/$0.75. gpt-5.6-sol promo, standard short context: 4 USD input and 20 USD output per 1M tokens. Cached input 0.40 USD. Cache writes 5 USD. Long context: 8 USD input and 30 USD output. Cached long input 0.80 USD. Promo pricing is available at least through 2026-11-21. Decisions API (public beta, POST /v1/decisions) applies only to gpt-6-luna: $0.10 per 1M input tokens, with no output, cache-read, or cache-write charge. Regional processing premiums and long-context multipliers still apply.
Realtime voice API, transcription, embeddings, tool calls
GPT-Live-1: full-duplex voice API (listens and speaks at the same time) at $0.05 per minute, billed by the second; backend model and tools billed separately
Agents API (public beta since September 10, 2026): OpenAI-hosted, managed Codex harness for durable cloud agents with sessions, context compaction, and up to 4 subagents; no separate harness fee, model tokens and tools billed at standard rates, optional hosted sandbox at container rates ($0.03/$0.12/$0.48/$1.92 for 1/4/16/64 GB per 20-minute session); US data residency only, no ZDR
gpt-6.1-sol standard short context: 2 USD input and 10 USD output per 1M tokens. Cached short input is 0.10 USD. Long context: 4 USD input and 15 USD output.
Ultrafast gpt-6-astra short context: 60 USD input and 300 USD output per 1M tokens. Long context: 120 USD input and 450 USD output. Sol Ultrafast is not in the Ultrafast table.
Usage tiers are Free, Build, Launch, and Grow. The tier rises automatically when total credit purchases reach the threshold. Free requires an allowed geography and a monthly usage limit of 100 USD. Build requires 5 USD of total credit purchases and a monthly usage limit of 500 USD. Launch requires 100 USD of total credit purchases and a monthly usage limit of 5000 USD. Grow requires 500 USD of total credit purchases and a monthly usage limit of 200000 USD. Monthly usage limits are separate from spend alerts and hard spend limits. The sample Standard limits differ from Ultrafast. On Build, Astra, Sol, and Terra are 5000 RPM and 1000000 TPM, and Luna is 5000 RPM and 2000000 TPM. On Launch, Astra, Sol, and Terra are 10000 RPM and 4000000 TPM, and Luna is 10000 RPM and 10000000 TPM. On Grow, Astra, Sol, and Terra are 15000 RPM and 40000000 TPM, and Luna is 30000 RPM and 180000000 TPM. Token list prices are unchanged.

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

Interactive API cost calculator for OpenAI API models

Calculate raw developer and inference token costs based on public OpenRouter pricing. These are independent of monthly consumer web subscriptions (such as ChatGPT Plus or Claude Pro). Prices subject to change without notice.

Limits

Standalone, usage-based price list on platform.openai.com, separate from ChatGPT subscription plans and from the already-listed OpenAI Image API and OpenAI Codex entries, which only cover narrow slices. Models, prices, and rate limits vary; full table on the official pricing page. gpt-6.1-sol costs 2 USD input and 10 USD output per 1M tokens on standard short context. Ultrafast gpt-6-astra costs 60 USD input and 300 USD output per 1M tokens on short context. gpt-5.6-sol promo, standard short context: 4 USD input and 20 USD output per 1M tokens. Cached input 0.40 USD. Cache writes 5 USD. Long context: 8 USD input and 30 USD output. Cached long input 0.80 USD. Promo pricing is available at least through 2026-11-21. gpt-rosalind-research costs 5 USD input, 0.50 USD cached input and 25 USD output per 1M tokens. Cache-write pricing does not apply. Billing has been active since 2026-10-05 and applies only to approved internal research in the trusted-access program. This is not an open public model. Usage tiers are Free, Build, Launch, and Grow. The tier rises automatically when total credit purchases reach the threshold. Free requires an allowed geography and a monthly usage limit of 100 USD. Build requires 5 USD of total credit purchases and a monthly usage limit of 500 USD. Launch requires 100 USD of total credit purchases and a monthly usage limit of 5000 USD. Grow requires 500 USD of total credit purchases and a monthly usage limit of 200000 USD. Monthly usage limits are separate from spend alerts and hard spend limits. The sample Standard limits differ from Ultrafast. On Build, Astra, Sol, and Terra are 5000 RPM and 1000000 TPM, and Luna is 5000 RPM and 2000000 TPM. On Launch, Astra, Sol, and Terra are 10000 RPM and 4000000 TPM, and Luna is 10000 RPM and 10000000 TPM. On Grow, Astra, Sol, and Terra are 15000 RPM and 40000000 TPM, and Luna is 30000 RPM and 180000000 TPM. Token list prices are unchanged.

Alternatives and similar tools to OpenAI 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.

2
2BA.AIEU-hosted, OpenAI-compatible coding-agent infrastructure with a flat request window. Not the OpenAI API alone.MonthlyLyzrEnterprise platform for deploying and governing AI agents, billed per agent run.Lyzr CloudfalGenerative media through an API plus serverless GPUs, billed by actual usage.Image modelsTwiggHosted context store, assembler, and model router: create a chat once, send only the next event.Prepaid usageCharisma.aiBuild interactive conversational AI experiences for web, apps, games and training.ProTogether AICloud platform where developers run open AI models via API, fine-tune them and rent dedicated GPUs.Serverless Inference (Pay-as-you-go)MonidDirectory and runtime for more than 1,700 agent tools, paid per call, usable through MCP, skill or CLI.Pay-per-callTypeSafe JevSystem One model Jev: typed decisions for software, not a chat assistant.Jev Early Access

Two tools at a glance: prices, limits and sources from the catalog. Side by side, not a ranking.

Gemini vs ChatGPT vs Claude

FAQ

Is OpenAI API available for free?

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

Where is the vendor of OpenAI API based?

OpenAI is based in the USA. Regardless of that location, data processing and privacy terms are governed by the vendor's own contract.

How is OpenAI API billed?

Standalone, usage-based price list on platform.openai.com, separate from the ChatGPT subscription plans and from the already listed entries OpenAI Image API and OpenAI Codex, which cover only parts of it. Models, prices and rate limits vary. Full table on the official pricing page. gpt-6.1-sol in short standard context: USD 2 input and USD 10 output per 1M tokens. Ultrafast gpt-6-astra in short context: USD 60 input and USD 300 output per 1M tokens. gpt-5.6-sol promo, short standard context: USD 4 input and USD 20 output per 1M tokens. Cached input USD 0.40. Cache writes USD 5. Long context: USD 8 input and USD 30 output. Cached long input USD 0.80. The promo applies at least until 2026-11-21.

What plans does OpenAI API offer?

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

Is OpenAI API currently available?

OpenAI 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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