Shortlist by what you need
Start here if you know why you are leaving GPT Proto.
Want the closest match?
SeedRouterMost similar to GPT Proto in what it does, its category and its price.
Visit (opens SeedRouter in a new tab)Want the lowest price?
TokenMixFrom $1/mo, the lowest starting price here.
Visit (opens TokenMix in a new tab)Want the best rated?
AI/ML APIRated 4.1 out of 5 in our review, against 4.0 for GPT Proto.
Visit (opens AI/ML API in a new tab)
At a glance
Green means better than GPT Proto, red means worse. Prices are starting prices per month.
| Tool | Our rating | Starts at | Free plan | Best for | Compare |
|---|---|---|---|---|---|
 GPT ProtoBaseline | 4.0 | Not listed | No | 200+ models on one API key, with per-model rates published and cheapest-channel routing. | |
| SeedRouter | 3.8−0.2 | $20/mo | No | One API key for image, video, language and audio models with pay-per-request billing from a prepaid balance, and no charge for failed requests. | vs GPT Proto |
| AI/ML API | 4.1+0.1 | $20/mo | No | Single OpenAI-compatible endpoint for calling GPT, Claude, Gemini, and 400-plus other AI models. | vs GPT Proto |
 Quartzite AI | 3.9−0.1 | $3.99/mo | No | One chat interface for 10+ models (Claude Opus 4.5, GPT-5.1, Gemini 3) with prompt version history and upfront token-cost estimates - bring your own API key. | vs GPT Proto |
| TokenMix | 3.9−0.1 | $1/mo | No | Change one base URL and your OpenAI code reaches Claude, Gemini, DeepSeek and Qwen. | vs GPT Proto |
 Avian.io | 3.9−0.1 | Not listed | No | A pay-per-token inference API runs frontier open-source LLMs at lower cost than most closed-model providers. | vs GPT Proto |
 SendHQ | 3.6−0.4 | $9/mo | No | Observable email infrastructure for product teams and AI agents | vs GPT Proto |
 Vynaris | 3.5−0.5 | $45/mo | No | An OpenAI- and Anthropic-compatible gateway that sends each call to the cheapest model that meets your quality bar | vs GPT Proto |
 Intrascope | 3.8−0.2 | $41/mo | No | Centralizes a team's AI model access, usage, and spending into one managed or bring-your-own-key workspace. | vs GPT Proto |
The alternatives in detail
In order of how closely each one matches GPT Proto.
SeedRouter
3.8$20/mo
vs GPT Proto−0.2
One API key for image, video, language and audio models with pay-per-request billing from a prepaid balance, and no charge for failed requests.
- Single API key across image, video, language and audio models
- OpenAI and Anthropic SDK compatibility for language models
- Prepaid USD balance with per-request billing
No monthly minimum or subscription
Prepaid balance model needs a top-up before any call
AI/ML API
4.1$20/mo
vs GPT Proto+0.1
Single OpenAI-compatible endpoint for calling GPT, Claude, Gemini, and 400-plus other AI models.
- Single endpoint for 400-plus AI models
- OpenAI SDK-compatible, no code rewrite needed to switch models
- Unified credit-based billing across all providers
One integration covers hundreds of models instead of numerous separate SDKs
No permanent free tier once starter tokens are used
Quartzite AI
3.9$3.99/mo
vs GPT Proto−0.1
One chat interface for 10+ models (Claude Opus 4.5, GPT-5.1, Gemini 3) with prompt version history and upfront token-cost estimates - bring your own API key.
- Access to 10+ models including Claude Opus 4.5, GPT-5.1, Gemini 3
- Markdown prompt editor with version history
- Token usage and cost estimation before execution
Transparent bring-your-own-key pricing, not a hidden markup on API costs
Requires managing your own API keys, more setup than a fully hosted tool
TokenMix
3.9$1/mo
vs GPT Proto−0.1
Change one base URL and your OpenAI code reaches Claude, Gemini, DeepSeek and Qwen.
- Single OpenAI-compatible endpoint across Claude, Gemini, DeepSeek and Qwen
- Works by changing only the base URL
- Prepaid wallet from $1 minimum top-up
A one-line base URL change, with no SDK rewrite
Per-model rates are not shown alongside the catalogue
Avian.io
3.9Not listed
vs GPT Proto−0.1
A pay-per-token inference API runs frontier open-source LLMs at lower cost than most closed-model providers.
- OpenAI-compatible API for open-source frontier models (DeepSeek, Kimi, GLM, MiniMax)
- Pay-per-token billing with no subscription or minimum monthly commitment
- Infrastructure hosting removes the need to self-manage GPU deployment for these models
OpenAI-compatible API means minimal code changes for teams already using that interface pattern
No free tier, every API call consumes paid credit from the first request
SendHQ
3.6$9/mo
vs GPT Proto−0.4
Observable email infrastructure for product teams and AI agents.
- Developer API for sending and receiving transactional email
- Separate inbox and sending identity per product, service or AI agent
- Domain verification plus delivery and bounce tracking
Giving each AI agent its own inbox and identity suits agent-driven products
No free tier
Vynaris
3.5$45/mo
vs GPT Proto−0.5
An OpenAI- and Anthropic-compatible gateway that sends each call to the cheapest model that meets your quality bar.
- Drop-in gateway compatible with the OpenAI and Anthropic APIs
- Routes each request to the cheapest model that passes current evaluations
- A routing receipt per call showing the model used, latency and cost
Switching needs one base_url change
Still in early beta
Intrascope
3.8$41/mo
vs GPT Proto−0.2
Centralizes a team's AI model access, usage, and spending into one managed or bring-your-own-key workspace.
- Single shared workspace balance instead of per-employee AI subscriptions
- Bring-your-own-API-key or fully managed billing across major model providers
- Real-time dashboards for token usage and spend by model, user, and project
Can cut real AI subscription waste from idle or duplicate paid seats
No permanent free tier, only a short trial period
FAQ
Questions people ask
Is GPT Proto free?
GPT Proto does not list a free plan. Check its pricing page for current plans.
What is the cheapest alternative to GPT Proto?
Among paid plans, TokenMix has the lowest starting price (from $1/mo).
How did you pick these alternatives?
We match tools on what they do, their category and their price, using the details in our directory. Ratings come from our reviews and reader reviews.