OpenAI API
Hosted API for OpenAI's text, image, audio and embedding models, billed per token.
Find alternatives to OpenAI API
What it does
- Text generation
- Code generation
- Image generation
- Speech to text
- Text to speech
How it compares
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Claude API
Rivals on three sourced fronts — consumer assistants, enterprise model APIs and coding agents; in mid-2025 enterprise LLM usage, Anthropic's 32% led OpenAI's 25%.
Anthropic now holds 32% of the enterprise large language model market share by usage, according to a report from Menlo Ventures released on Thursday. OpenAI holds the second-largest market share by usage among enterprises, with 25%.
News reporting · 25 Aug 2026 -
Gemini Enterprise Agent Platform (formerly Vertex AI)
One measured enterprise-LLM market: OpenAI's usage share fell from 50% in 2023 to 27% at end-2025 while Google's grew to 21% — a former leader losing ground to a hyperscaler platform.
Anthropic holds a dominant lead over its AI rivals when it comes to enterprise large language model usage. The AI research lab holds a 40% market share, according to a December report from VC firm Menlo Ventures (which, it should be noted, has invested aggressively in Anthropic). In July, the startup’s market share was estimated to be 32%. Google’s Gemini adoption has been steadier, according to Menlo Ventures. The company released its enterprise product last fall and has seen its enterprise LLM usage market share largely stay the same, per Menlo’s findings, growing from 20% in July to 21% at the end of the year. OpenAI on the other hand has seen its usage market share drop from 50% in 2023 to 27% at the end of 2025 — a trend that appears to concern the company.
News reporting · 25 Aug 2026 -
Cohere Platform
Both enterprise LLM APIs in Menlo's measured market; OpenAI holds 27% of spend — down from 50% in 2023 — while Cohere shares the 12% tail with Mistral and Meta's Llama.
We estimate Anthropic now earns 40% of enterprise LLM spend, up from 24% last year and 12% in 2023. Over the same period, OpenAI lost nearly half of its enterprise share, falling to 27% from 50% in 2023. Google also saw significant gains, increasing its enterprise share from 7% in 2023 to 21% in 2025. Together, these three companies account for 88% of enterprise LLM API usage, with the remaining 12% spread across Meta’s Llama, Cohere, Mistral, and a long tail of smaller providers.
Research report · 25 Aug 2026 -
Mistral AI Studio
Both enterprise LLM APIs in Menlo's measured market; OpenAI holds 27% of spend — down from 50% in 2023 — while Mistral shares the 12% tail with Cohere and Meta's Llama.
We estimate Anthropic now earns 40% of enterprise LLM spend, up from 24% last year and 12% in 2023. Over the same period, OpenAI lost nearly half of its enterprise share, falling to 27% from 50% in 2023. Google also saw significant gains, increasing its enterprise share from 7% in 2023 to 21% in 2025. Together, these three companies account for 88% of enterprise LLM API usage, with the remaining 12% spread across Meta’s Llama, Cohere, Mistral, and a long tail of smaller providers.
Research report · 25 Aug 2026 -
LightOn Enterprise
soit parce qu'elles sont adossées à des groupes importants telles que OpenAI, soutenue par Microsoft et Anthropic soutenue par Google et Amazon, ou parce qu'elles ont procédé à des levées de fonds importantes comme Cohere, H ou Mistral
Regulatory filing · 7 Nov 2024 -
AI21 Studio
If we lose deals, it's to OpenAI, mostly.
News reporting · 19 Sep 2026 -
Pharia-1-LLM
As companies that develop large language models, Aleph Alpha and Cohere have been hometown stars, while still lagging far behind OpenAI and the likes globally.
News reporting · 19 Sep 2026 -
Fireworks AI
Fireworks is the inference and adaptation platform engineering teams move to when they've validated their product on OpenAI or Anthropic and need production-grade open-source inference, model customization, and reliability at scale.
Official documentation · 20 Sep 2026 -
Inference Providers
OpenAI competes with Hugging Face for enterprise inference and fine-tuning budgets, although its model stack is fully proprietary and vertically integrated
Research report · 19 Sep 2026 -
StepFun Open Platform
We introduce a state-of-the-art image editing model, Step1X-Edit, which aims to provide comparable performance against the closed-source models like GPT-4o and Gemini2 Flash.
Official documentation · 19 Sep 2026 -
xAI API
Can I use the OpenAI or Anthropic SDK with Grok? Yes. Point your existing SDK at base URL https://api.x.ai/v1 with your SpaceXAI API key.
Official documentation · 19 Sep 2026 -
Solar LLMs
Solar Pro 2 delivered results comparable to leading frontier-scale models including OpenAI's GPT-4o, DeepSeek's R1, Mistral's Small 3.2, and Alibaba's Qwen 3—despite being less than half their size.
Official documentation · 19 Sep 2026
Sources
- Pricing
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Official documentation · 2 Sep 2026
Verified 2026-09-02: URL 200, product unchanged; pricing lives at /api/pricing/.
- Constraints
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Derived from this product's security block by scripts/fixes/derive-constraints-met.py; see provenance.security.
- Security
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Portal scope names the API Platform. BAA, DPA, ZDR (eligible endpoints, on approval) and encryption from openai.com/enterprise-privacy; training, residency and BYOK from the API's your-data guide; RBAC, SCIM, IP allowlist and audit logs from the API docs. FedRAMP Moderate is the fedramp.gov marketplace's listing of a separately provisioned ChatGPT Enterprise and API Platform configuration.
- Sold within
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OpenAI's own model pricing page, read 2026-09-06: per-token rates for gpt-6-astra and the rest. Bought on its own, with no ChatGPT plan involved.
Also from OpenAI
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ChatGPT Application
Assistant for chat, web search, file analysis and image generation, used in the browser and in desktop and mobile apps; developers can build custom in-chat apps for it via the Apps SDK, built on the Model Context Protocol.
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ChatGPT for Word Application
ChatGPT in a Microsoft Word sidebar: drafts, revises and reorganizes the open document from notes or pasted source text, pulling in context from connected apps like Outlook, SharePoint, Google Workspace and Dropbox.
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ChatGPT for Excel Application
ChatGPT in the Excel ribbon: builds and edits spreadsheets, formulas and formatting from plain-language requests, answers questions about what is in the workbook, and asks permission before changing it. OpenAI's own page bundles this with a separate ChatGPT for Google Sheets add-in; this record covers the Excel add-in only.
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ChatGPT for PowerPoint Application
ChatGPT in the PowerPoint ribbon: creates new slides, rewrites and restructures an existing deck, and turns notes, documents or spreadsheets into presentation-ready content while keeping the output editable in PowerPoint.
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ChatGPT Atlas Application
OpenAI's agentic web browser. Deprecated on 9 August 2026, with its browser-based agentic capabilities moved into ChatGPT and Codex.
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ChatGPT Gov Application
A version of ChatGPT that US government agencies deploy in their own Microsoft Azure commercial or Azure Government cloud, so the agency manages its own security, privacy and compliance.
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Codex AI agent
Coding agent that reads, edits and runs a codebase from the terminal, an IDE extension and the ChatGPT web app.
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OpenAI Daybreak Agent platform
OpenAI's cybersecurity offering, bringing together frontier cyber models, Codex Security and partner workflows to find, validate and fix vulnerabilities, with an access-gated Daybreak Red tier for authorised vulnerability research and red teaming.
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OpenAI Frontier Agent platform
Enterprise platform for connecting AI agents to systems of record and running them under enterprise identity, access and observability controls.
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Sora Application
OpenAI's text-to-video product. The web and app experiences were discontinued on 26 April 2026; the API will be discontinued on 24 September 2026.
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