The four platforms most-cited in "best LLM gateway" lists for 2026 — Bifrost, LiteLLM, Portkey, and ThinkNEO — approach cost control from different angles. This post compares them on the six dimensions that matter for enterprise budget management: attribution, per-team quotas, hard budget blocks, BYOK, provider-dashboard reconciliation, and audit ledger.
The comparison at a glance
| Dimension | Bifrost | LiteLLM | Portkey | ThinkNEO |
|---|---|---|---|---|
| Attribution granularity | Virtual key + team | Virtual key | Virtual key + user | Project + workspace + user |
| Per-team quotas | Yes | Yes | Yes | Yes |
| Hard USD budget block | Yes (four-level hierarchy) | Yes (per key) | Yes | Yes (fail-closed default) |
| BYOK | Yes | Yes | Yes | Yes |
| Provider-dashboard reconciliation | Yes | Yes | Yes | Yes (documented) |
| Audit ledger | Yes | Basic (Postgres tables) | Yes | Yes (immutable, tamper-evident) |
| Deployment model | OSS self-host | OSS self-host | Managed + OSS core | Managed + BYO-cloud |
| Metering source of truth | Provider response | Provider response | Provider response | Provider response + versioned pricing |
Bifrost (Maxim AI)
Strength: Go implementation, published ~11 µs per-request overhead, four-level budget hierarchy (org → team → key → user). Semantic caching. Ships as OSS you self-host.
Cost control angle: enforcement lives in the request path itself — before a token is sent to a provider, the cap is checked and the request rejected inline if exhausted. Provider failover on outages. Free open-source; enterprise offering is Maxim's Bifrost Enterprise.
Where it fits: engineering teams that want to own their gateway, need very high throughput on a single instance, and are comfortable operating a Go service in production.
LiteLLM
Strength: 100+ provider adapters, OpenAI-compatible API, MIT license, large community. Per-key spend caps and budget reset windows. Self-hosted by default; also available as managed via LiteLLM Cloud.
Cost control angle: per-key budgets fail the request once the reset window closes. Virtual keys per team. Good enough for many teams; less enterprise-shaped than the others (no native RBAC beyond keys, audit is what you build from the Postgres schema).
Where it fits: developer-led teams who want a proven OSS proxy and are willing to build the enterprise fit-and-finish themselves.
Portkey
Strength: 250+ models, guardrails (PII redaction, jailbreak detection), prompt versioning, semantic caching, virtual keys, SOC 2 / HIPAA / GDPR. Very polished managed product.
Cost control angle: budget alerts and limits per virtual key. Chargeback-ready per-team reporting. Passes provider rates through — Portkey does not mark up tokens.
Where it fits: teams that want a managed product with guardrails and prompt management on top of the gateway, and are comfortable with a per-request fee on top of provider costs.
ThinkNEO
Strength: enforcement plane with explicit fail-CLOSED default for cost budgets and fail-NEUTRAL default for quotas. BYOK by default. Real, honest, arithmetic metering (no fabricated tokens — the design decision is documented). Immutable audit ledger. Project + workspace + user attribution.
Cost control angle: hard USD budget block that stops the call before the model runs, wired to a versioned pricing catalog. Multi-threshold warnings (50%, 75%, 90%). Model gates for expensive tier. Provider dashboards reconcile with gateway numbers.
Where it fits: enterprises that need audit-ready cost control from day one, want BYOK to be genuine (tokens billed to their own provider account), and are comfortable with a managed control plane.
The dimension that isn't in the table: what happens when the meter is wrong
Every gateway on this list will occasionally produce a wrong cost number. The question is what happens next.
- OSS gateways (Bifrost, LiteLLM): you own the fix. You can read the code, patch the meter, redeploy. Turnaround measured in engineering hours.
- Managed gateways (Portkey, ThinkNEO): the vendor fixes it. You file a ticket and wait. Turnaround measured in vendor response time.
What ThinkNEO added, in response to its own historical bug (a database trigger that filled in default token counts), is a public corrections table: every row that was ever fabricated is flagged with a corrections record, and aggregations use a view that respects the corrections. The story of the bug is public. That is not the fastest response mode, but it is the most honest one.
How to choose
- If you already operate Go services and want to own the gateway → Bifrost.
- If you want maximum provider coverage and are willing to build the enterprise polish → LiteLLM.
- If you want a polished managed product with guardrails bundled → Portkey.
- If you want fail-CLOSED cost enforcement out of the box, BYOK done right, and immutable audit → ThinkNEO.
None of these choices is wrong. The wrong choice is deferring the decision until the first cost anomaly, which is exactly the incident the gateway would have prevented.
Related reading: What is LLM cost control? · ThinkNEO vs Bifrost · ThinkNEO vs LiteLLM