# AI Agent Tools With GPT/OpenAI Support

> Source: https://theagentsindex.com/collections/ai-agent-tools-with-gpt-openai-support (curated, quality-gated, re-verified)
> Curated by: The Agents Index Editorial, Research desk

"Supports GPT" means something different depending on which of these 48 tools you're looking at, and the difference matters if you're choosing one to integrate. We read every listing's own sourced `modelLLM` fact — and, where that field alone was silent, its `whatItDoes` or `integrations` text — rather than trusting the `gpt` tag alone. That check also had to rule out several tools that only LOOK like a match on a keyword search: Ada, Sierra and GC AI each name "ChatGPT" or "OpenAI" somewhere in their own listing, but as a caller integration or a founder's biography, never as the model actually powering their own agent, so none of the three is included here.

**GPT-only (4)** — no other model vendor is offered at all: [OpenAI Realtime API](/openai-realtime-api), [Synthflow AI](/synthflow-ai), [Microsoft Fabric Data Agent](/microsoft-fabric-data-agent) and [Unify](/unify), whose own listing names no model but GPT anywhere in its research.

**GPT among a short, vendor-picked list (15)** — the vendor offers GPT alongside a small, fixed set of other frontier models, usually Claude and/or Gemini, not an open provider layer: [Cursor](/cursor), [GitHub Copilot](/github-copilot), [Devin](/devin), [Windsurf](/windsurf), [Relevance AI](/relevance-ai), [Clay](/clay), [Perplexity](/perplexity), [Salesforce Agentforce](/salesforce-agentforce), [PolyAI](/polyai), [CodeRabbit](/coderabbit), [Glean](/glean), [Genspark](/genspark), [Zendesk AI Agents](/zendesk-ai-agents), [OpenAI Codex CLI](/codex-cli) and [Julius AI](/julius-ai).

**GPT via a broad model-agnostic or BYOK layer (30)** — GPT is one of many, often dozens, of named providers reachable through a generic bring-your-own-key or LiteLLM-style integration, not a vendor-curated shortlist: [n8n](/n8n), [Microsoft AutoGen](/microsoft-autogen), [Microsoft Agent Framework](/microsoft-agent-framework), [OpenAI Agents SDK](/openai-agents-sdk), [Agno](/agno), [Dify](/dify), [GPT Researcher](/gpt-researcher), [ElevenLabs Conversational AI](/elevenlabs-conversational-ai), [Juggler](/juggler), [OpenCode](/opencode), [Zot](/zot), [Warp](/warp), [Zed](/zed), [Vecbase](/vecbase), [Google ADK](/google-adk), [Botpress](/botpress), [Deepgram Voice Agent API](/deepgram-voice-agent-api), [Junie](/junie), [OpenClaw](/openclaw), [LangChain](/langchain), [Cline](/cline), [Aider](/aider), [Pydantic AI](/pydantic-ai), [OpenHands](/openhands), [LiveKit Agents](/livekit-agents), [Mastra](/mastra), [Cartesia](/cartesia), [CrewAI](/crewai), [Goose](/goose) and [LangGraph](/langgraph).

[Coding agents](/category/coding-agents) lead the count at 16 of 25 — GPT access is close to the category norm there — followed by [frameworks](/category/frameworks) at 10 of 14, [voice agents](/category/voice-agents) at 7 of 12, [agent platforms](/category/agent-platforms) at 9 of 16 and [research and data agents](/category/research-agents) at 5 of 11. [Support agents](/category/support-agents) has just 1 entry, Zendesk AI Agents — GPT access is still the exception, not the rule, in that category.

| Name | What it is | Why it's here | Pricing | API |
| --- | --- | --- | --- | --- |
| [OpenAI Realtime API](https://theagentsindex.com/openai-realtime-api.md) | OpenAI's own speech-to-speech model API for voice agents: WebRTC, WebSocket or native SIP telephony, billed purely on audio tokens with no platform fee. | OpenAI's own realtime speech-to-speech models only — gpt-realtime-2.1 (flagship) or gpt-realtime-2.1-mini — no other provider is offered. | — | Yes |
| [Synthflow AI](https://theagentsindex.com/synthflow-ai.md) | A no-code voice AI platform for enterprise phone agents — a visual Flow Designer and a structured Build-Evaluate-Launch-Learn deployment cycle, billed by the minute in separate components. | OpenAI only — GPT-4.1 mini, GPT-4.1 or GPT-5 variants depending on plan, with no other model vendor publicly documented. | — | Yes |
| [Microsoft Fabric Data Agent](https://theagentsindex.com/microsoft-fabric-data-agent.md) | A generally available, governed natural-language Q&A agent built into Microsoft Fabric. It turns plain-English questions into SQL, DAX, KQL or GQL over your own lakehouse, warehouse, Power BI, mirrored and graph data, run as the requesting user, permission-scoped and read-only. | Fixed to a GPT-4-series model behind the Azure OpenAI Assistant APIs — cannot be changed or swapped by the user. | — | Yes |
| [Unify](https://theagentsindex.com/unify.md) | A single conversational GTM agent for warm outbound — self-serve from $0, built to augment a seller rather than replace one. | GPT-5.4 on the Free/Base/Pro tiers or GPT-5.6 on Business — always OpenAI, and not user-selectable. | — | Yes |
| [Cursor](https://theagentsindex.com/cursor.md) | The AI-first code editor (a VS Code fork) with a coding agent that reads, plans and edits across your whole codebase. Free Hobby tier, Pro from $20/month. | Claude, GPT and Gemini are all selectable per request, with no single default. | — | Yes |
| [GitHub Copilot](https://theagentsindex.com/github-copilot.md) | GitHub's AI coding assistant with an issue-to-PR coding agent, multi-agent control plane (Claude Code + OpenAI Codex bundled), and broad IDE coverage. Free tier with 2,000 completions/month; Pro from $10/month. | GPT is one of three selectable models in Copilot Chat, alongside Claude and Gemini. | — | Yes |
| [Devin](https://theagentsindex.com/devin.md) | Devin is Cognition's autonomous coding agent: assign a task through Slack, CLI, or the web app, and it plans, edits, tests, and opens a pull request inside its own sandbox. | GPT runs alongside Claude, Gemini and Cognition's own SWE-tuned models under the hood. | — | Yes |
| [Windsurf (now Devin Desktop)](https://theagentsindex.com/windsurf.md) | The agentic IDE that began as Codeium, then Windsurf, now Cognition’s Devin Desktop. An open command centre for local and cloud coding agents. | GPT sits alongside Claude and Gemini as a general model option, on top of Windsurf's own SWE-tuned models, carried over into the Devin Desktop rebrand. | — | — |
| [Relevance AI](https://theagentsindex.com/relevance-ai.md) | Visual builder for multi-agent AI workforces, with evals, tracing, and SSO-grade governance on Enterprise. | GPT is one of three models its router can select per task, alongside Claude and Gemini. | — | Yes |
| [Perplexity](https://theagentsindex.com/perplexity.md) | The AI answer engine. Cited answers, Deep Research, and the Comet browser that acts on the web for you. | GPT is one of six selectable models for Pro users, alongside Sonar, Claude, Gemini, GLM and Kimi. | — | Yes |
| [Salesforce Agentforce](https://theagentsindex.com/salesforce-agentforce.md) | Salesforce's enterprise platform for building, testing and running AI agents across customer and employee workflows, with CRM actions, voice, APIs, MCP and multi-agent orchestration. | GPT-5.x is one of the model options admins can select, alongside Claude, Gemini or a bring-your-own-model, not the default. | — | Yes |
| [PolyAI](https://theagentsindex.com/polyai.md) | The pre-LLM-era enterprise voice AI incumbent ($750M-valued, 200+ enterprise customers): sales-led only again after a May 2026 self-serve tier went away. | GPT-5 joined PolyAI's own proprietary Raven model as a selectable option in May 2026, alongside Claude and Gemini. | — | Yes |
| [CodeRabbit](https://theagentsindex.com/coderabbit.md) | An AI code-review and security platform that reviews every pull request across GitHub, GitLab, Bitbucket and Azure DevOps, with a real free tier for unlimited repos. | OpenAI models power its review backend alongside Claude Opus/Sonnet/Haiku, orchestrated internally rather than user-selectable. | — | Yes |
| [Glean](https://theagentsindex.com/glean.md) | Enterprise "Work AI" platform — permission-aware search across 100+ systems, an AI assistant and a no-code agent builder, all grounded in one Knowledge Graph. $7.2B valuation (June 2025), $200M ARR by December 2025. | Admins enable and switch to GPT from an LLM admin console, alongside Claude and Gemini, on top of Glean's own retrieval layer. | — | Yes |
| [Genspark](https://theagentsindex.com/genspark.md) | One web workspace for research, files, slides, code, media and agent-run tasks, backed by a persistent context layer. | One of nine specialized models — with Claude, Gemini, DeepSeek and others — its Super Agent routes across and cross-checks. | — | Yes |
| [Zendesk AI Agents](https://theagentsindex.com/zendesk-ai-agents.md) | The customer-facing AI agent built into Zendesk's Suite helpdesk, now with Forethought's autonomous engine bundled in, billed per Verified Resolution on top of a per-seat plan. | GPT-4o is the primary backend, with Anthropic, Google and Amazon Bedrock also supported. | — | Yes |
| [OpenAI Codex CLI](https://theagentsindex.com/codex-cli.md) | OpenAI's open-source (Apache-2.0) terminal coding agent, bundled into ChatGPT plans from Free through Pro — Business seats are grandfathered-only. | OpenAI's own CLI, built on the GPT-5.6 family, with built-in support for local Ollama/LM Studio models or Amazon Bedrock as alternates. | — | Yes |
| [Julius AI](https://theagentsindex.com/julius-ai.md) | Chat-based AI that turns your data into charts, reports, and presentations for knowledge workers. | GPT-5.6 is one of a short frontier set — with Claude Sonnet 5 and Claude Fable 5 — offered on top of Julius’s own models, and which of them you get depends on your plan. | — | — |
| [n8n](https://theagentsindex.com/n8n.md) | Source-available workflow automation with native AI-agent nodes and 500+ integrations. Self-hostable free, or on n8n Cloud from €20/month. | A named model-agnostic option alongside Anthropic and Ollama that its AI nodes can call. | — | Yes |
| [Microsoft AutoGen](https://theagentsindex.com/microsoft-autogen.md) | Microsoft's open-source framework for orchestrating conversations between multiple AI agents. Now in maintenance mode. | OpenAI and Azure OpenAI are first-class in its otherwise model-agnostic `autogen-ext` design. | — | — |
| [Microsoft Agent Framework](https://theagentsindex.com/microsoft-agent-framework.md) | Microsoft's unified, MIT-licensed agent SDK for .NET and Python: the supported successor to AutoGen and Semantic Kernel. | A named provider alongside Azure OpenAI, Anthropic Claude, Ollama and Gemini (via its Go SDK). | — | Yes |
| [OpenAI Agents SDK](https://theagentsindex.com/openai-agents-sdk.md) | OpenAI's lightweight open-source framework for building agents in Python and TypeScript, with handoffs, guardrails, tracing and a sandboxed workspace mode for long-running work. | OpenAI's own SDK, first-class by design, extensible to 100+ other providers via LiteLLM. | — | Yes |
| [Agno](https://theagentsindex.com/agno.md) | An Apache 2.0 Python agent SDK and AgentOS runtime, with a Control Plane you run in your own cloud. | One of 20+ providers reachable through its model-agnostic Python interface, alongside Anthropic, Ollama and others. | — | Yes |
| [Dify](https://theagentsindex.com/dify.md) | Open-source, visual platform for building production LLM apps and agents, self-host it or run it in the cloud. | One of hundreds of model-agnostic options it can connect, alongside Anthropic, Google and open/local models. | — | Yes |
| [GPT Researcher](https://theagentsindex.com/gpt-researcher.md) | Open-source autonomous research agent that plans a question, fans out across many sources and writes a cited report. Bring your own LLM and search keys. | One of several model-agnostic providers — with Anthropic, Google and local Ollama models — it can run on. | — | Yes |
| [ElevenLabs Conversational AI](https://theagentsindex.com/elevenlabs-conversational-ai.md) | The voice-quality specialist’s own agent layer, 10,000+ voices and instant cloning, with a bring-your-own-LLM brain. | One of three bring-your-own-key providers, with Anthropic and Google, or any OpenAI-compatible endpoint, or ElevenLabs' own hosted default. | — | Yes |
| [Juggler](https://theagentsindex.com/juggler.md) | A free, open-source visual workbench for AI coding agents: each session is an editable Yjs tree, not a transcript. Single Go binary, no Electron, by the creator of JUCE. | One of six selectable providers — with Claude, Gemini, Ollama, OpenRouter and DeepSeek — in its visual, model-agnostic canvas. | — | No |
| [OpenCode](https://theagentsindex.com/opencode.md) | A free, open-source (MIT) AI coding agent for the terminal, desktop and IDE, with 75+ model providers, built-in subscription login, and a tested model marketplace behind it. | Reachable through its 75+-provider Models.dev integration, alongside Claude, Gemini and local Ollama models. | — | Yes |
| [Zot](https://theagentsindex.com/zot.md) | A free, MIT-licensed coding-agent harness in one Go binary. Branch any session from any past message, run 30+ model providers from one catalog, and DM the agent from Telegram. | One of 30+ named providers — with Anthropic, Gemini, Kimi, DeepSeek and more — in its self-hosted, model-agnostic CLI. | — | Yes |
| [Warp](https://theagentsindex.com/warp.md) | An open platform for automating development: an open-source terminal, a standalone coding agent, and cloud-agent factories that orchestrate Claude Code, Codex, Gemini CLI and Warp's own agent across your SDLC. | A named provider its terminal can orchestrate, alongside Anthropic and z.ai — and it runs OpenAI's own Codex CLI directly as a hosted agent. | — | Yes |
| [Zed](https://theagentsindex.com/zed.md) | The open-source, GPU-native code editor built from scratch by Atom's creators — runs Claude Code, Codex and other agents via the Agent Client Protocol it created. | First-class, named support alongside Anthropic, Google, Mistral, DeepSeek and more — and it natively runs OpenAI Codex as an external agent via the ACP it created. | — | — |
| [Vecbase](https://theagentsindex.com/vecbase.md) | One workspace where AI agents with roles like Researcher, Coder, Writer, and Operator work as a team | One of several selectable models — alongside Claude, Gemini, Kimi, DeepSeek or Vecbase's own — billed per token. | — | Yes |
| [Google Agent Development Kit](https://theagentsindex.com/google-adk.md) | Google's open-source, code-first agent SDK with five language runtimes (Python, TypeScript, Go, Java, Kotlin), native A2A and MCP support, and an optional managed runtime on Google Cloud. | Reachable via LiteLLM alongside 100+ other providers, on top of native first-party Gemini support. | — | Yes |
| [Botpress](https://theagentsindex.com/botpress.md) | An open-source (MIT) AI agent platform for customer support, with bi-directional MCP support, webchat, WhatsApp and voice channels. Self-host free or use the managed cloud from $0/month. | One of the model-agnostic options, alongside Anthropic Claude, Google Gemini and open-weight models. | — | Yes |
| [Deepgram Voice Agent API](https://theagentsindex.com/deepgram-voice-agent-api.md) | The speech-infrastructure vendor's own voice-agent API. Managed STT, LLM and TTS over a single WebSocket, $4.50/hr flat, with 6 LLM providers and self-hosted or VPC deployment on the same product. | One of six bring-your-own-key LLM providers — with Anthropic, Google, NVIDIA, Groq and Amazon Bedrock — or Deepgram manages the model for you by default. | — | Yes |
| [Junie](https://theagentsindex.com/junie.md) | JetBrains' own AI coding agent. Plans before it codes, drives the real IDE debugger, runs across the JetBrains IDE family plus a standalone CLI. Free 30-day Pro trial; Pro from $10/month. | Reachable via JetBrains AI credits or bring-your-own-key, alongside Anthropic and Google frontier models, plus local runtimes via Ollama/LiteLLM. | — | Yes |
| [OpenClaw](https://theagentsindex.com/openclaw.md) | Open source AI assistant that runs on your machine and manages email, calendar, and tasks via WhatsApp or Telegram | One of three hosted-account options, with Claude and DeepSeek, plus bring-your-own-key or a fully local model — genuinely model-agnostic, not GPT-first. | — | Yes |
| [LangChain](https://theagentsindex.com/langchain.md) | The most widely-used framework for building LLM apps and agents, with LangGraph for stateful multi-agent control: open-source and free to self-host. | A named model-agnostic integration alongside Anthropic and Google, documented explicitly rather than inferred. | — | Yes |
| [Cline](https://theagentsindex.com/cline.md) | The open-source coding agent. Bring your own key. Runs in your editor, terminal, and as an SDK, with optional ClinePass for flat-rate open-model access. | A named provider in its bring-your-own-key setup, alongside Anthropic, Google, OpenRouter, Bedrock, Azure, Vertex, DeepSeek, xAI, Mistral and more. | — | Yes |
| [Aider](https://theagentsindex.com/aider.md) | Open-source AI pair programming in your terminal, free under Apache 2.0, built to run against 14 LLM providers | A named provider in its bring-your-own-key setup, alongside Anthropic, DeepSeek and local models. | — | No |
| [Pydantic AI](https://theagentsindex.com/pydantic-ai.md) | The Python AI SDK for type-safe agents, realtime voice, image generation and embeddings, with every model a string swap away. | A named provider in its type-safe, model-agnostic interface, alongside Anthropic, Gemini, Mistral, Cohere, DeepSeek, Grok and Ollama. | — | — |
| [OpenHands](https://theagentsindex.com/openhands.md) | Open source platform for cloud coding agents. Free local OSS, free Individual Cloud tier, self-hosted Enterprise with SSO and RBAC. | Named by its own docs as a bring-your-own-key example alongside Claude, or use OpenHands' own hosted models on a pay-as-you-go basis. | — | Yes |
| [LiveKit Agents](https://theagentsindex.com/livekit-agents.md) | The Apache 2.0 voice-agent framework. 13.1k GitHub stars, self-hostable, and the only open-source pick in this category with fully published pricing. | A named LLM provider in its default pipeline alongside Deepgram, Anthropic and ElevenLabs, or bring your own via LiveKit-hosted Inference — and it powers OpenAI's own ChatGPT Advanced Voice Mode under the hood. | — | Yes |
| [Mastra](https://theagentsindex.com/mastra.md) | The TypeScript-native agent framework. Agents, durable workflows, memory and observability in one Apache 2.0 package, with an optional managed cloud platform. | One of the 90+ providers its model-agnostic layer supports, documented by name alongside Anthropic and Gemini. | — | Yes |
| [Cartesia](https://theagentsindex.com/cartesia.md) | The Stanford SSM-research spinout behind Sonic (TTS) and Ink (STT) — Line, its open-source voice-agent SDK, connects to 100+ LLMs and starts at a genuine $0/month, but the agent layer itself isn't self-hostable. | Reachable for the Line agent layer via its LiteLLM integration (100+ providers); Cartesia's own Sonic/Ink speech models are separate and proprietary. | — | Yes |
| [CrewAI](https://theagentsindex.com/crewai.md) | Open-source Python framework for role-based multi-agent crews, with a hosted build and runtime that adds enterprise governance, native SDKs for the major LLMs, and Ollama via LiteLLM. | Model-agnostic via LiteLLM, so it can drive agents on OpenAI, Anthropic, local/open models and others, documented explicitly in its own FAQ. | — | Yes |
| [Goose](https://theagentsindex.com/goose.md) | Open source AI coding agent with a desktop app, CLI, and 70+ MCP extensions across 15+ LLM providers, backed by the Linux Foundation | One of 15+ providers its ACP integration can call, alongside Anthropic, Google and Ollama, or reuse an existing ChatGPT subscription instead of a separate API key. | — | Yes |
| [LangGraph](https://theagentsindex.com/langgraph.md) | Open-source, MIT-licensed framework for building stateful, multi-agent AI workflows on cyclical graphs. | OpenAI is the first provider its own docs name, alongside Anthropic and Google and an open-ended list beyond them — the same model-agnostic layer LangChain sits on. | — | Yes |

## How this list is built

A tool earns a place here only if its own Published, sourced listing's `attributes.modelLLM` field — or, where that field alone was silent, its `whatItDoes`/`integrations`/FAQ text — names OpenAI or GPT specifically as a model the tool itself runs on. A generic "model-agnostic" or "bring your own model" claim with no provider named anywhere in the listing does not qualify on its own, and neither does a mention of "ChatGPT" or "OpenAI" that describes something other than the tool's own underlying model — a caller integration, a founder's background, or a named competitor. Every entry is additionally sorted into one of three tiers: GPT-only (no other vendor's models are offered at all), GPT among a small vendor-picked set of frontier models, or GPT reachable through a broad model-agnostic/BYOK layer alongside many other named providers. Verified directly against each listing's own already-researched, gate-passed fields, not inferred from the `gpt` tag alone. Re-verified against the live 89-listing corpus on 2026-08-18: removed Vapi (no named model provider anywhere in its listing history) and LlamaIndex (named OpenAI as a model provider until an unrelated 2026-08-16 edit dropped that line; flagged to listing for restoration rather than asserted here from memory), and added Goose (created 2026-08-17, names OpenAI explicitly). Net 50 -> 49.