Compare AI tools

	GitHub Copilot B	OpenRouter S	Claude Agent SDK S	OpenAI Voice / Realtime S
Tagline	Microsoft/GitHub's autocomplete. Deep VS Code + JetBrains integration.	One API, every model. Pay-as-you-go, no subscriptions.	Anthropic's SDK for building your own agents on Claude.	ChatGPT's voice + the Realtime API for developers.
Category	Coding	Dev Platform	Agents	Voice
Pricing	Free (limited) + $10/mo Pro + $19/mo Business	Pay per token — model-dependent	API usage + SDK is free	Voice included with ChatGPT Plus; Realtime API by usage
Best for	Teams with GitHub already. Devs who don't want to change IDEs.	Developers experimenting across models. Apps that want fallback logic.	Developers building custom agents for their own company/product.	Voice chat users, developers building voice agents on OpenAI.
Strengths	Great enterprise story Works in your existing IDE Chat + autocomplete	300+ models from one endpoint Automatic fallbacks between providers No subscription — just pay what you use	Production-grade agent primitives Built on Claude (best reasoning) Full control — build exactly what you need	Advanced Voice Mode feels genuinely conversational Realtime API enables true two-way voice apps Built into ChatGPT
Weaknesses	Less agentic than Cursor/Claude Code Model quality varies	Slight markup over direct API Some provider features not exposed	Developer-only You build the UI	Pricey for production apps Less voice variety than ElevenLabs Platform lock-in
Kai's verdict	B-tier. Solid for autocomplete but the category moved past it. Pick Cursor unless you can't.	S-tier for model-shopping. I use this for every prototype before committing.	S-tier for builders. The right primitives. What Kai is built on under the hood.	S-tier for conversation. A-tier for TTS. Complement to ElevenLabs, not replacement.
Link	Open →	Open →	Open →	Open →