by Theo Park13 min readOpenRouter, LLM Gateway, Comparison, LiteLLM, Portkey, Vercel AI Gateway

Best OpenRouter Alternatives in 2026: a side-by-side for production use

An honest, source-cited comparison of the LLM gateways teams reach for when OpenRouter no longer fits — markup, model coverage, protocol compatibility, and governance.

OpenRouter is a household name for unified LLM access, but it isn’t the only option anymore. This article evaluates seven gateways the way a platform team would: markup, protocol compatibility, model coverage, governance, and self-host versus SaaS. Every non-trivial fact below is sourced and linked — no claims from memory.

Method.For each candidate we checked the official pricing page or product docs, the GitHub repository where applicable, and at least one independent reference. Where a number wasn’t available on a primary source by April 28, 2026 we say so explicitly rather than guess. OminiGate is one of the candidates and is described in the same neutral register as the others.

Why teams look beyond OpenRouter

OpenRouter pioneered the “one key, many models” pattern and remains the reference design for an LLM aggregator. Two facts are useful to keep straight before comparing the field.

  • OpenRouter does not mark up inference.Per the official FAQ, OpenRouter “passes through the pricing of the underlying providers without any markup on inference pricing.” The widely-cited “5% markup” figure refers to something different.
  • The fee is on credit purchases. Effective June 9, 2025 OpenRouter charges 5.5% with a $0.80 minimum for non-crypto top-ups and a flat 5% for crypto. Bring-Your-Own-Key requests above 1M/month carry a 5% usage fee that the team has signalled will move to a flat monthly subscription.
  • Attribution headers HTTP-Referer and X-Title are optional for making calls work, but required if you want to appear on OpenRouter rankings.

So when teams say they’re “leaving OpenRouter,” the reasons usually collapse into one of these: (1) the credit-purchase fee is unwelcome at scale, (2) the team wants self-hosted observability and key governance, (3) they need first-class Anthropic Messages support that the official Anthropic SDK can hit unmodified, or (4) they want access to image and video models alongside text in one billing surface.

Evaluation criteria

We rate each candidate on six dimensions. None of these are scored — the right gateway depends on your stack, not a leaderboard.

  • Markup. Does the gateway add a per-token surcharge, a per-call fee, a credit-purchase fee, a flat monthly subscription, or nothing at all?
  • Protocol compatibility. Does it expose /v1/chat/completions (OpenAI) and /v1/messages (Anthropic) so existing SDKs work without rewrites?
  • Model coverage. Text only, or does the same gateway also serve image and video?
  • Deployment. SaaS, self-host, or both?
  • Governance. Per-key budgets, rate limits, RBAC, audit logs, SSO.
  • Observability. Built-in tracing, cost attribution, dashboards.

The candidates

LiteLLM

LiteLLM is the most popular open-source proxy in this category. The repository advertises a single OpenAI-compatible interface to 100+ providers, and the docs confirm a native Anthropic-format endpoint at /v1/messages that the official Anthropic SDK can call by changing only the base_url. Endpoints supported include /chat/completions, /messages, /responses, /embeddings, /images, and /audio.

The license is MIT for most of the codebase, with the enterprise/ directory under a separate commercial license that gates SSO, RBAC, audit logs, and prioritized support. There is no hosted SaaS that markets itself as a managed gateway — you run the proxy yourself, and the credentials and observability stack are yours to operate.

Portkey

Portkeyis positioned as the “control panel for production AI.” The free Developer tier covers up to 10,000 logs/month with 3-day log retention. The first paid tier is $49/month for 100,000 logs with overage at $9 per additional 100k up to 3M, plus advanced alerts, unlimited prompt templates, guardrails, and semantic caching. Enterprise pricing is custom and ranges into thousands per month for SOC 2 / HIPAA / VPC deployments.

The gateway itself is open source and routes to 200+ LLMs with 50+ guardrails. Anthropic Messages format is supported through the proxy — Claude Code users can point ANTHROPIC_BASE_URL at a Portkey endpoint. The pitch is governance, not raw routing.

Vercel AI Gateway

Vercel AI Gatewaywent GA in August 2025 and is the most aggressive on price. The pricing page is explicit: “AI Gateway uses a pay-as-you-go model with no markups” and “If you use a custom API key, there is no markup or fee from AI Gateway.” Every Vercel team gets $5/month in free credits.

Vercel exposes both an OpenAI-compatible interface and an Anthropic-compatible endpoint so the Anthropic SDK and Claude Code work via base-URL swap. Catalog is the major hyperscaler models; the focus is depth of integration with Vercel AI SDK v5 rather than the long tail. The launch is widely credited with pressuring OpenRouter into its 2025 fee simplification.

Helicone

Helicone began as an LLM observability tool (YC W23) and has evolved into a Rust-built open-source AI Gateway licensed Apache 2.0. The gateway charges 0% markup; revenue comes from the cloud observability tiers. Free includes 10,000 requests/month with 1-month retention; Pro is $79/month; Team is $799/month; Enterprise is custom with on-prem and SAML SSO.

The gateway is single-binary, claims sub-10ms P50 latency, and provides automatic failover, GCRA rate limiting, and edge caching. It exposes an OpenAI-compatible interface across 100+ providers with observability wired in by default.

Bifrost

Bifrost from Maxim AI is the newest entrant and the most performance-focused. Apache-2.0 licensed Go binary, advertised at 11μs gateway overhead at 5,000 RPS. It unifies 15+ providers behind a single OpenAI-compatible API, with Anthropic, OpenAI, and other SDKs swapped in via base-URL substitution (http://localhost:8080/anthropic).

Where Bifrost goes beyond a routing proxy is its first-class MCP gateway: the full Model Context Protocol spec including STDIO, HTTP, and SSE transports, agent and code modes, plus tool hosting. Per-team and per-key budgets, audit logs, and SSO ship in the box. There is no hosted SaaS — you run it yourself, configured by a npx command or Docker.

Eden AI

Eden AI is closer to a multi-modal SaaS hub than a pure LLM gateway. Beyond 500+ language models it serves OCR, document parsing, translation, and other expert AI features through one API. Pricing is provider list price plus a 5.5%platform fee at credit checkout — structurally identical to OpenRouter’s non-crypto fee.

For teams that want one billing surface for “all the AI,” not just LLMs, Eden is the most natural fit. For teams that only need text generation it is more abstraction than they need.

OminiGate

OminiGate (this site) is a unified LLM gateway with 400+ models spanning text, image, and video, billed per token or per call against a prepaid balance with no monthly fee. The OpenAI-compatible base is https://api.ominigate.ai/v1 for /v1/chat/completions and the image/video endpoints; the Anthropic-compatible base is https://api.ominigate.ai (the SDK appends /v1/messages). API keys are prefixed sk-omg-.

OminiGate is hosted only — there is no self-host distribution. Governance currently covers per-key spend caps, rate limits, and an admin-side audit trail; advanced enterprise items like SAML SSO and on-prem are not yet shipped. Image and video sit on dedicated endpoints (/v1/images/..., /v1/videos/...) — a single chat-completions call cannot return an image or a video, so multi-modal projects route by endpoint, not by a single uniform request.

Side-by-side matrix

Read this as a fingerprint, not a verdict. A “0% markup” line item next to a “$799/month observability” one is not a cost win — it’s the same cost moved to a different invoice.

  • OpenRouter — 5.5% credit-purchase fee (5% crypto), no inference markup, OpenAI- and Anthropic-format endpoints, 400+ text/image/video models, SaaS only.
  • LiteLLM — 0% markup, MIT (enterprise dir separate), self-host only, OpenAI + Anthropic + Responses + Embeddings + Images + Audio endpoints, ~45k GitHub stars, governance via paid Enterprise edition.
  • Portkey — 0% markup, Apache-licensed gateway, free up to 10k logs/month, $49/month entry tier, 200+ LLMs, OpenAI + Anthropic compatible, SaaS or self-host, RBAC and SSO in paid tiers.
  • Vercel AI Gateway — 0% markup including BYOK, $5/month free credits, OpenAI + Anthropic compatible endpoints, GA Aug 2025, SaaS only, deepest integration with Vercel AI SDK v5.
  • Helicone — 0% markup gateway (Apache 2.0, Rust), $79/month Pro for observability, 100+ providers, OpenAI-compatible, sub-10ms P50, self-host or SaaS.
  • Bifrost — 0% markup, Apache 2.0, Go, 11μs overhead at 5k RPS, OpenAI- compatible plus drop-in Anthropic SDK base-URL, full MCP gateway, self-host only, 15+ providers.
  • Eden AI — 5.5% credit-purchase platform fee, 500+ models plus OCR / translation / document AI, SaaS only.
  • OminiGate — pay-per-token / per-call against prepaid balance, no subscription, 400+ text + image + video models, OpenAI + Anthropic compatible endpoints, SaaS only, per-key spend caps and rate limits.

Choosing for your scenario

You already have provider keys and want fewest fees

Vercel AI Gateway and Helicone both publish 0% markup including BYOK. If you’re on Vercel already, AI Gateway is the path of least friction. If you want self-host control and still want a hosted dashboard, Helicone gives you both surfaces from the same vendor.

You need self-host with serious governance

LiteLLM, Portkey, Bifrost, and Helicone all publish self-host paths. LiteLLM has the deepest provider catalog and the largest community; Portkey is the most enterprise-feature- complete out of the box; Bifrost is the fastest at high RPS and the only one shipping a first-class MCP gateway; Helicone is the lightest binary and the most observability-native.

You need text + image + video on one bill

OpenRouter and OminiGate both serve image and video alongside text. OpenRouter has the broader long-tail catalog; OminiGate exposes dedicated image/video endpoints rather than squeezing them through chat-completions. Eden AI extends further into non-LLM AI (OCR, translation) if the workload is genuinely multi-modal beyond generation.

You want the Anthropic SDK to work unchanged

LiteLLM, Vercel AI Gateway, Portkey, OpenRouter, and OminiGate all expose an Anthropic- compatible /v1/messages path that the official SDK can hit by changing only the base URL. Bifrost provides drop-in Anthropic SDK support via base-URL substitution but the docs are less explicit about full Messages-format parity — verify your specific feature surface (tool use, streaming, vision) before committing.

You’re building agents heavy on MCP and tool use

Bifrost is the only candidate here that ships MCP as a first-class capability across all three transports. If your agent pipeline is MCP-shaped, that matters more than aggregator breadth.

OpenRouter remains a defensible default for “just give me one key.” The candidates above each win on a different axis: zero-markup BYOK (Vercel), self-host with deep enterprise features (Portkey, LiteLLM), raw performance and MCP (Bifrost), observability-as-the-product (Helicone), non-LLM coverage (Eden), or multi-modal generation on one prepaid balance (OminiGate). The answer is whichever axis your platform team cares about most.

Sources

Frequently asked questions

› Does OpenRouter actually charge a 5% markup on inference?

No. OpenRouter’s FAQ says it passes through provider pricing without inference markup. The 5%/5.5% number is a credit-purchase fee (5% crypto, 5.5% non-crypto with $0.80 minimum) effective June 9, 2025. There is also a 5% BYOK fee on usage above 1M requests/month, which the team has signalled will move to a flat monthly subscription.

› Which alternatives let the official Anthropic SDK work without code changes?

LiteLLM exposes /v1/messages with the Anthropic SDK pointed at its proxy base URL. Vercel AI Gateway provides an Anthropic-compatible API that Claude Code and the Anthropic SDK can use via base-URL swap. Portkey supports it via ANTHROPIC_BASE_URL. OpenRouter and OminiGate also speak the Messages format. Bifrost ships drop-in Anthropic SDK base-URL support but the docs are less explicit on full Messages-format parity — verify your specific feature surface (tool use, streaming, vision) before committing.

› Which option is genuinely zero-markup including BYOK?

Vercel AI Gateway’s pricing page states that with a custom API key “there is no markup or fee from AI Gateway,” and the gateway in general is pay-as-you-go with no markups. Helicone’s open-source AI Gateway is free and adds 0% markup; you only pay for the cloud observability tiers if you choose them. LiteLLM and Bifrost are self-host-only and add nothing on top of provider pricing — you pay the infrastructure and operations cost.

› Can I get image and video models through the same gateway as text?

OpenRouter, OminiGate, and Eden AI all serve image and video alongside text. OpenRouter has the broadest long-tail catalog. OminiGate exposes dedicated image/video endpoints (/v1/images/..., /v1/videos/...) rather than overloading chat-completions, so a single chat call cannot return an image. Eden AI extends further into non-LLM AI like OCR and translation. The pure-LLM gateways (LiteLLM, Portkey, Vercel, Helicone, Bifrost) focus on text and tool use; image and audio support exists on some but is not their headline use case.

› If I need self-host with serious governance, which one should I pick?

LiteLLM has the broadest provider catalog and the largest community (~45k stars), with SSO, RBAC, and audit logs gated behind the Enterprise edition. Portkey’s open-source gateway plus its paid tiers ship the most enterprise features out of the box (RBAC, granular budgets, SOC 2). Bifrost is the fastest at high RPS and is unique in shipping a first-class MCP gateway. Helicone is the lightest single binary and the most observability-native. Pick by which axis matters most for your team — there isn’t a single “best.”

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