Best AI Model APIs & Infra
Last updated: 2026-09
This category is for developers building on top of AI rather than using it through a chat interface: foundation model APIs (an LLM API) from the major labs, plus infrastructure for running open models, hosting inference, and routing requests across providers. Pricing per token, latency, and model selection are the comparison points that actually matter here, not brand reputation. Compare per-token cost across providers before you commit; the difference for similar output quality can be an order of magnitude. See each provider's own pricing page, linked from its tool page below, for exact current rates.
Model APIs are one half; the other is letting the host call your stack. Curated MCP servers with install JSON and access warnings.
What to look for
- Compare per-token pricing carefully, costs can differ by an order of magnitude between providers for similar quality.
- If you need to run open-weight models, check GPU availability and cold-start times, not just listed specs.
- Multi-provider routers are useful if you want to avoid lock-in to a single model vendor.
- Compare blended cost on your real prompt mix (input vs output tokens), not headline price-per-million alone.
- If you need multi-model routing or spend caps, an API gateway layer saves more money than switching base models.
Most compared in this category
Tools peers mention most often when picking an alternative — a stand-in for “most looked at” until we wire live traffic ranks.
OOpenAI APIOpenAI's developer API — billed per token, separate from a ChatGPT subscription.
TTogether AIHosted open-source models with fine-tuning support.
RReplicateOne API for open models — you pay GPU-seconds, and a warm private deploy is a 24/7 rent.
OOpenRouterOne API to route requests across 300+ models.
CCometAPIOne API key and one endpoint for 500+ AI models from OpenAI, Anthropic, Google, and more.
All 23 tools in this category
OOpenAI APIOpenAI's developer API — billed per token, separate from a ChatGPT subscription.
AAnthropic APIClaude models via API, with long context windows.
GGemini APIGoogle's multimodal models for developers.
GGroqLPU inference for open models — Llama 8B/70B left the self-serve catalog; GPT-OSS 20B/120B are the listed production prices.
TTogether AIHosted open-source models with fine-tuning support.
OOpenRouterOne API to route requests across 300+ models.
RReplicateOne API for open models — you pay GPU-seconds, and a warm private deploy is a 24/7 rent.
HHugging FaceThe open-model Hub — PRO is storage and ZeroGPU, not a $9 chatbot.
AAssemblyAISpeech-to-text and audio-understanding models delivered as a developer API.
CCohereEnterprise-focused LLM and embedding APIs for search, RAG, and chat.
LLightning AICloud platform to build, train, and deploy AI, from the PyTorch Lightning team.
EEvidently AIOpen-source evaluation and monitoring for ML and LLM systems.
LLeap AIAPIs and SDKs to add image generation and fine-tuning to your app.
SSequence MonkeyMobvoi's multimodal large-model open platform for developers.
AAlibaba Cloud BailianAlibaba Cloud's one-stop platform to build and deploy LLM apps.
CCometAPIOne API key and one endpoint for 500+ AI models from OpenAI, Anthropic, Google, and more.
CCrunOne API for 100+ video, image, audio, and language models, including Sora 2, Veo 3.1, Suno, and Midjourney.
KKie APIA single API and credit wallet for video, image, audio, and LLM models at 30-50% below official provider pricing.
MMesh APIAn OpenAI-compatible gateway to 1,000+ AI models from one API key, with zero markup and automatic failover.
PPika API ClubA $10/month membership that unlocks wholesale pricing across 100+ generative video, image, and audio models.
WWeave RouterRoutes each coding-agent request to the cheapest model that can still do the job.
AAppwriteOpen-source backend platform, rebuilt so AI agents can provision and run it directly.
TTwiggStateful LLM API that stores your conversation and routes it across providers.
Side-by-side comparison
| Tool | Best for | Pricing | Free tier? |
|---|---|---|---|
| OpenAI API | OpenAI's developer API — billed per token, separate from a ChatGPT subscription. | Pay per token; no monthly platform fee | No |
| Anthropic API | Claude models via API, with long context windows. | Usage-based, pay per token | No |
| Gemini API | Google's multimodal models for developers. | Free tier, usage-based pricing above limits | Yes |
| Groq | LPU inference for open models — Llama 8B/70B left the self-serve catalog; GPT-OSS 20B/120B are the listed production prices. | Free tier then pay-per-token; GPT-OSS is the public catalog now | Yes |
| Together AI | Hosted open-source models with fine-tuning support. | Usage-based, pay per token or per GPU-hour | No |
| OpenRouter | One API to route requests across 300+ models. | Usage-based, pay per token across providers | No |
| Replicate | One API for open models — you pay GPU-seconds, and a warm private deploy is a 24/7 rent. | Pay per second of hardware; public models skip idle/setup | No |
| Hugging Face | The open-model Hub — PRO is storage and ZeroGPU, not a $9 chatbot. | Free Hub; PRO $9/mo; Team $20/user/mo; compute is extra | Yes |
| AssemblyAI | Speech-to-text and audio-understanding models delivered as a developer API. | Usage-based API pricing, free tier to start | No |
| Cohere | Enterprise-focused LLM and embedding APIs for search, RAG, and chat. | Usage-based API pricing, free trial keys | No |
| Lightning AI | Cloud platform to build, train, and deploy AI, from the PyTorch Lightning team. | Free tier, plus usage-based and paid plans | Yes |
| Evidently AI | Open-source evaluation and monitoring for ML and LLM systems. | Open-source, plus paid Cloud | Yes |
| Leap AI | APIs and SDKs to add image generation and fine-tuning to your app. | Free tier, plus usage-based API pricing | Yes |
| Sequence Monkey | Mobvoi's multimodal large-model open platform for developers. | Free tier, plus usage-based API | Yes |
| Alibaba Cloud Bailian | Alibaba Cloud's one-stop platform to build and deploy LLM apps. | Usage-based, plus free trial credits | No |
| CometAPI | One API key and one endpoint for 500+ AI models from OpenAI, Anthropic, Google, and more. | Pay-as-you-go, no monthly fee - roughly 20% below official model pricing | No |
| Crun | One API for 100+ video, image, audio, and language models, including Sora 2, Veo 3.1, Suno, and Midjourney. | Pay-as-you-go, per-model pricing (no subscription) | No |
| Kie API | A single API and credit wallet for video, image, audio, and LLM models at 30-50% below official provider pricing. | Prepaid credits (~$0.005 each), pay-as-you-go per model | No |
| Mesh API | An OpenAI-compatible gateway to 1,000+ AI models from one API key, with zero markup and automatic failover. | Pay-as-you-go, 0% platform markup; custom volume pricing | No |
| Pika API Club | A $10/month membership that unlocks wholesale pricing across 100+ generative video, image, and audio models. | $10/month membership + pay-as-you-go usage at member rates | No |
| Weave Router | Routes each coding-agent request to the cheapest model that can still do the job. | Free, source-available self-host; hosted plan takes 5% of routed spend | Yes |
| Appwrite | Open-source backend platform, rebuilt so AI agents can provision and run it directly. | Free self-hosted Community Edition; usage-based Cloud plans | Yes |
| Twigg | Stateful LLM API that stores your conversation and routes it across providers. | Usage-based API pricing | No |
Pricing and free-tier flags last reviewed 2026-09. Plans change often — confirm on each product's site before you buy.
FAQ
Which AI model API is cheapest?
It changes by the month as providers cut prices, so check current per-token rates rather than trusting older comparisons. Open-weight models hosted yourself are usually cheapest at scale if you can absorb the GPU and ops overhead.
What's the difference between a model API and an inference platform?
A model API (OpenAI, Anthropic, Google) gives you access to a specific closed model. An inference platform runs open-weight models for you, or lets you self-host them, which trades some quality ceiling for cost control and no vendor lock-in.
Do I need a multi-provider router?
Only if avoiding lock-in to one vendor, or routing by cost and latency across models, actually matters for your use case. For a single small project, calling one provider's API directly is simpler and has less to debug.