Best AI Gateway & LLM Router in 2026: Independent Comparison
The AI gateway market has consolidated fast. In early 2026, three events reshaped the landscape: Helicone was acquired by Mintlify (entering maintenance mode), LiteLLM suffered a supply chain attack that compromised thousands of deployments, and Portkey locked compliance features behind enterprise pricing. If you're evaluating gateways today, the decision matrix looks very different from six months ago.
This guide compares the six major options across pricing, features, latency, and operational complexity. No sponsored rankings — just engineering analysis.
The Contenders
| Gateway | Language | Approach | Best For |
|---|---|---|---|
| Portkey.ai | TypeScript | Managed SaaS, enterprise focus | Teams needing full observability stack |
| Helicone | Rust | Managed SaaS (maintenance mode) | Existing users; new users should evaluate alternatives |
| LiteLLM | Python | Self-hosted open source | Teams with DevOps capacity wanting full control |
| OpenRouter | Proprietary | Managed marketplace | Access to 400+ models with unified API |
| Vercel AI Gateway | TypeScript | Framework-native (Vercel ecosystem) | Next.js teams already on Vercel |
| NeuralRouting.io | Python | Managed SaaS with intelligent routing | Cost optimization with quality guarantees |
Pricing Breakdown (Real Numbers)
Understanding the true cost of each gateway requires looking beyond the sticker price. Some charge per log, some per request, some take a markup on model costs.
Portkey.ai
- Free: 10K logs/month, 3-day retention
- Production: $49/month (100K logs, 15-day retention)
- Enterprise: Custom pricing (required for SOC2, SSO, self-hosting)
Hidden costs: Guardrails, advanced analytics, and compliance are enterprise-only. You won't know the price until you talk to sales. Users on G2 report documentation gaps that increase onboarding time.
Helicone
- Free: 10K requests/month
- Pro: $79/month (unlimited seats, 1-year retention)
- Team: $799/month (SOC2 + HIPAA compliance)
Current status: Acquired by Mintlify in March 2026. Only receiving security patches. No new features planned. The 16,000 organizations using Helicone need to plan their migration.
LiteLLM
- Open Source: Free (requires self-hosting: Redis + PostgreSQL + your infra)
- Enterprise Basic: $250/month
- Enterprise Premium: $30,000/year
Hidden costs: Infrastructure ($200-$500/month for Redis + PostgreSQL + compute), 2-4 weeks DevOps setup time, ongoing maintenance burden. The March 2026 supply chain attack (versions 1.82.7-1.82.8 compromised with credential-stealing malware) adds a trust cost that's hard to quantify.
OpenRouter
- Free: No gateway fee
- Markup: 5.5% on all model costs
At scale: On $10K/month in model costs, you're paying $550/month in markup. At $50K/month, that's $2,750. No routing intelligence, no caching, no quality guarantees. Pure pass-through.
Vercel AI Gateway
- Free: Included with Vercel Pro ($20/month)
- Features: Rate limiting, caching, basic analytics
Limitations: Tightly coupled to Vercel ecosystem. Limited provider support compared to dedicated gateways. No intelligent routing or cost optimization.
NeuralRouting.io
- Free: 5K credits/month
- Starter: $29/month (50K credits)
- Growth: $89/month (200K credits)
- Business: $349/month (1M credits)
What's included at every tier: Intelligent model routing, semantic caching, quality validation via Shadow Engine, prompt security shield, spend analytics. No features locked behind enterprise pricing.
Feature Matrix
| Feature | Portkey | Helicone | LiteLLM | OpenRouter | Vercel AI | NeuralRouting |
|---|---|---|---|---|---|---|
| Intelligent routing | Basic fallback | Basic (PeakEWMA) | Basic fallback | None | None | Per-query complexity routing |
| Semantic caching | Production+ only | Edge caching | No | Prompt caching | Basic | All tiers |
| Quality validation | No | No | No | No | No | Shadow Engine |
| Prompt security | Guardrails (Enterprise) | Rate limiting only | Enterprise only | No | Rate limiting | All tiers |
| Cost optimization | Manual model selection | No | Manual | No | No | Automatic (Model Cascading) |
| Self-healing routing | No | No | No | No | No | Confidence Matrix |
| Models supported | 250+ | 100+ | 100+ | 400+ | 20+ | 5 (growing) |
| OpenAI SDK compatible | Yes | Yes (proxy) | Yes | Yes | Yes (AI SDK) | Yes |
| Observability | Full | Full | Basic | Basic | Basic | Dashboard + API |
| Active development | Yes | No (maintenance) | Yes (recovering) | Yes | Yes | Yes |
Latency Comparison
Latency is critical for production AI applications. Every millisecond of gateway overhead compounds across thousands of daily requests.
- Portkey: Not publicly disclosed. Enterprise users report reasonable performance but no published benchmarks.
- Helicone: ~8ms P50, ~50ms P95 gateway overhead. Rust-based, historically fast.
- LiteLLM: ~8ms per request (self-hosted, depends on your infrastructure).
- OpenRouter: Variable. Pass-through to providers with marketplace overhead.
- Vercel AI Gateway: Low overhead when deployed on Vercel edge network.
- NeuralRouting: ~118ms average including routing classification. The local heuristic classifier adds < 1ms; the rest is provider response time.
The Routing Intelligence Gap
This is where the market diverges most sharply. Most gateways are proxies — they forward your request to the model you specified, add logging, and return the response. They don't decide which model to use.
NeuralRouting's Model Cascading is fundamentally different:
- Classify: A zero-cost local classifier analyzes prompt complexity in < 1ms
- Route: Simple tasks → Llama 3 (60x cheaper). Complex tasks → GPT-4o
- Validate: The Shadow Engine compares economy responses against premium quality in the background
- Learn: The Confidence Matrix tracks quality per (task_type, model) pair and automatically adjusts routing thresholds
This closed-loop system means the router gets smarter over time. No other gateway in this comparison offers this capability publicly.
Who Should Use What
Choose Portkey if: You need full observability, your team has budget for enterprise pricing, and you want a mature managed platform.
Choose LiteLLM if: You have DevOps capacity, need self-hosting for data sovereignty, and can maintain the infrastructure long-term. Verify supply chain security carefully.
Choose OpenRouter if: You need access to 400+ models and don't care about cost optimization or intelligent routing.
Choose Vercel AI Gateway if: You're already on Vercel and need basic gateway features without adding another vendor.
Choose NeuralRouting if: Cost optimization is your primary goal, you want automatic routing intelligence without manual model selection, and you value quality guarantees backed by continuous validation.
Avoid Helicone for new projects: It's in maintenance mode with no roadmap.
Conclusion
The AI gateway market in 2026 rewards different choices depending on your priorities. For pure observability, Portkey leads. For model access breadth, OpenRouter wins. For self-hosting control, LiteLLM (with security caveats) is the option.
But if you're optimizing for cost with quality guarantees — which is what most production teams actually need — the Model Cascading + Shadow Engine + Confidence Matrix combination in NeuralRouting is unmatched. No other gateway automatically routes by complexity, validates quality in real-time, and self-improves from production data.
The Model Tax is real. The question is whether you'll keep paying it.