Alternatives to Open Responses Server
30 tools that compete with or replace Open Responses Server. Ranked by direct product-type match — not generic category overlap.
What is the best Open Responses Server alternative?
The best Open Responses Server alternative today is LiteLLM because it is a safe bet on our live viability checks and AI engines read it more than any other option here; it also has a free tier.
Ranked on live viability checks, real-user mentions and how often AI engines read each tool — never pay-for-placement.
Why people look for alternatives to Open Responses Server
The complaints that come up most often in public discussion — reviews, forums and community threads. Not our opinion, and not the vendor's marketing.
- Duplicate /v1 in URL issue with vLLM shows base URL handling bugs.
- Community support is nearly nonexistent; only 2 relevant GitHub posts found.
- In-memory state is lost on restart, breaking long-running sessions.
- Insufficient documentation for edge cases, relying on readme and sparse issues.
Drawn from 26 mentions across 3 sources · researched Sep 1, 2026.
In fairness: users also consistently praise bridge any openai-compatible backend to the responses api, enabling codex cli locally, and mcp server support for both chat completions and responses apis expands tool use. A complaint list is not a verdict — see the full picture on the Open Responses Server page.
LiteLLM
LiteLLM is a self-hosted AI gateway putting 140+ providers and 1,800+ models behind one OpenAI-compatible API.
Github Copilot Api Vscode
Open-source VS Code extension that turns your GitHub Copilot subscription into a local OpenAI-compatible API server on port 3030.
Olla
Olla is an open-source, Apache-2.0 Go LLM proxy that load-balances Ollama, vLLM, SGLang and MLX behind one OpenAI-compatible endpoint on
Agnes AI
Agnes AI delivers text, image and video generation through one OpenAI-compatible API, with a free tier to start.
9router
Open-source AI routing gateway that fronts 60+ providers behind one OpenAI-compatible endpoint at localhost:20128/v1.
backdoor
Backdoor proxies Claude Code to DeepSeek, Groq, Ollama, or OpenRouter with a 3-command install and MIT-licensed source.
Free GPT Grok Gemini Claude API
One OpenAI-compatible API key routing to OpenAI, Anthropic, Google, and 100+ open-source models.
OpenRouter Agents
Route one OpenAI-compatible API key across 500+ models on 80+ providers, text to audio
CometAPI
One OpenAI-compatible API key for 500+ AI models at 20-40% below official provider rates
TrueFoundry AI Gateway
One OpenAI-compatible gateway in front of 1,600+ models, with quotas, RBAC, guardrails and an MCP gateway for agent tool calls.
OmniRoute
OmniRoute routes 352 AI providers through one OpenAI-compatible endpoint with automatic fallback.
Gateway
Portkey's AI Gateway routes, caches, and governs 1600+ LLMs through one OpenAI-compatible API endpoint.
TokenHot
TokenHot is an OpenAI-compatible LLM API gateway that cuts frontier model API costs by up to 90% with one base URL swap.
Crazyrouter
One OpenAI-compatible API key for 600+ models, with cost-optimized routing and pay-as-you-go billing
MakeHub.ai
OpenAI-compatible API load balancer that routes each LLM request to the fastest, cheapest provider in real time.
APIMaster
Buy verified GPT, Claude, Nano Banana and Seedance API keys through one OpenAI-compatible endpoint at up to 90% off.
Arch
Plano is an open-source AI-native proxy for smart LLM routing, agent orchestration, and guardrails in agentic apps.
GPTProto
One OpenAI-compatible API key for 200+ text, image, and video models at 10–30% below official rates.
APIMart
One OpenAI-compatible API for 190+ AI image, video, LLM, and audio models at discounted pay-as-you-go rates
Kaopu API
Unified AI API gateway routing one OpenAI-compatible endpoint across 50+ upstream model services
Text-Generator.io
OpenAI-compatible AI API gateway with automatic model routing across 17 providers
Windows-Copilot-API
Calls Microsoft Copilot's free consumer chat as an OpenAI-compatible API on localhost:8000/v1
Netlify AI Gateway
Use OpenAI, Anthropic, Gemini, OpenRouter and TypeSafe models in your Netlify functions with no API keys to manage.
NadirClaw
Nadir is an LLM router that sends each prompt, and each Claude Code or Codex turn, to the cheapest model that can still do it.
Echo
Open-source SDK that swaps the Vercel AI SDK so your users pay for their own LLM tokens through Echo Sign-In, and you never front the inference bill.
GPT API Free
A free multi-model API key that speaks OpenAI and Claude SDKs across GPT, Claude, Gemini, DeepSeek, Qwen, GLM, Kimi and MiniMax.
Not Diamond
Not Diamond routes each prompt to the best-fit LLM — GPT-4o, Claude, or Gemini — automatically.
BodhiApp
BodhiApp is a self-hosted AI gateway for local GGUF models, OpenAI/Anthropic/Gemini cloud APIs, and MCP tool calling behind one login.
OnAPI
OnAPI unifies GPT, Claude, Gemini, Sora, Veo and Banana behind one API key and one bill for multi-modal apps
jev-codex-router
Per-turn Codex model routing that picks the model and thinking depth for every call, not once per session.
Open Responses Server alternatives compared
| Tool | Pricing type | Starting price | Free tier | Last verified | Viability |
|---|---|---|---|---|---|
| Open Responses Server | Free | — | Yes | Moderate | |
| LiteLLM | Freemium | Custom pricing | Yes | Safe bet | |
| Github Copilot Api Vscode | Free | Free | Yes | Moderate | |
| Olla | Free | Free | Yes | Safe bet | |
| Agnes AI | Freemium | — | Yes | Moderate | |
| 9router | Freemium | Usage-based | Yes | Safe bet | |
| backdoor | Free | Free | Yes | Safe bet | |
| Free GPT Grok Gemini Claude API | Freemium | — | Yes | Moderate | |
| OpenRouter Agents | Freemium | Usage-based | Yes | Safe bet |
First row is Open Responses Server itself. Starting price is the cheapest paid plan on each vendor's published pricing; viability is our band, not a score.
Is there a cheaper alternative to Open Responses Server?
Open Responses Server does not publish a fixed monthly price we can compare against, so we do not name a cheaper option; the table shows each alternative's starting price.
Which Open Responses Server alternative is free?
LiteLLM has a free tier on its published pricing and is also our top pick. Free tiers change often; the "Last verified" column shows when we last checked each one.
Is Open Responses Server still active?
Yes. Open Responses Server is live and its listing was verified on 26 Oct 2026.
Frequently asked questions
What is the best Open Responses Server alternative?
The best Open Responses Server alternative today is LiteLLM because it is a safe bet on our live viability checks and AI engines read it more than any other option here; it also has a free tier.
Is there a cheaper alternative to Open Responses Server?
Open Responses Server does not publish a fixed monthly price we can compare against, so we do not name a cheaper option; the table shows each alternative's starting price.
Which Open Responses Server alternative is free?
LiteLLM has a free tier on its published pricing and is also our top pick. Free tiers change often; the "Last verified" column shows when we last checked each one.
Is Open Responses Server still active?
Yes. Open Responses Server is live and its listing was verified on 26 Oct 2026.
What are the best alternatives to Open Responses Server?
We currently list 30 alternatives to Open Responses Server: LiteLLM, Github Copilot Api Vscode, Olla, Agnes AI, 9router. Each is ranked by direct product-type match rather than generic category overlap.
How do you choose which Open Responses Server alternatives to show?
Alternatives are ranked by direct product-type match — tools that do the same job — not by shared category tags. Every listed tool is independently re-verified on a continuous cycle.
How this page is made: a human editor decides what is published. Drafts are proposed by a mixture of models (Claude Opus 4.5, GPT Codex and DeepSeek’s strongest models) working from our own verified data — live site checks, current pricing and the public sentiment we gather from Reddit, Product Hunt, G2 and community forums — and the editor keeps, corrects or strikes each line. Nothing here is pay-for-placement. Read the full methodology.