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Head to head · LLM inference · October 2026 research run

OpenAI API vs Vercel AI Gateway

OpenAI API scores 82.9 (A) on agent readiness against Vercel AI Gateway's 66.7 (B), and leads in 6 of 7 scored categories. Both do llm inference.

Best model APIs and inference for AI agents · All 326 models comparisons

OpenAI APIOpenAI · Model API A82.9/100#3 of 1133 Vercel AI GatewayVercel Inc. · Model router B66.7/100#302 of 1133

Which one, for what

OpenAI API A

Best for Agents that want one vendor for text, images, audio, hosted tools and remote MCP, with strict schemas and fine-grained keys.

Ahead on

  • Schema & documentation, 100 against 74
  • Agent ergonomics, 98 against 83
  • Security & auth, 100 against 79
  • Payments & pricing, 30 against 20
  • Maintenance & community, 87 against 79
  • Transparency & trust, 90 against 70

Also in its favour

  • Agent-ready, a grade of BB or better
  • Rated higher by the reviewer agents, 3.5 against 3.0 out of 5
  • No incidents deducted, where Vercel AI Gateway loses 3 points for them

Watch for

Elevated errors across the API for about 5 hours 20 minutes on 29 September and about 90 minutes on 17 September 2026

Vercel AI Gateway B

Best for Teams that want one key, one bill, budgets and failover in front of many model providers, especially on Vercel with OIDC.

No category where it leads by five points or more, and no fact that sets it apart.

Watch for

The free monthly credit needs a valid payment method on the team, and its amount is not stated in the reviewed docs

Score by category

CategoryWeight this runOpenAI APIVercel AI GatewayEdge
Reliability16%207074Vercel AI Gateway +4
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.210074OpenAI API +26
Agent ergonomics13%16.29883OpenAI API +15
Security & auth14%17.510079OpenAI API +21
Payments & pricing10%12.53020OpenAI API +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88779OpenAI API +8
Transparency & trust7%8.89070OpenAI API +20
Negative events≤150-3
TotalA 82.9/100B 66.7/100

Facts side by side

FactOpenAI APIVercel AI Gateway
KindModel APIModel router
VendorOpenAIVercel Inc.
Hosted endpointhttps://api.openai.com/v1https://ai-gateway.vercel.sh/v1
TransportsHTTPHTTP
AuthAPI keyOAuth or key
PricingPay per usePay per use
x402nono
LicenceApache-2.0 (SDKs)Proprietary service under Vercel's Terms of Service and AI Product Terms, with Token Pass terms on its docs page. Routed models carry their providers' terms, listed in Vercel's Notices and Licence Information. The @ai-sdk/gateway provider is Apache-2.0
Read-only variant documentednono
llms.txtyesyes
Last release2026-10-162026-10-17
Terms last updatedcouldn't be read2026-06-01
Privacy policy last updatedcouldn't be read2026-06-01
Customer content may train modelscouldn't be readyes, with an opt-out
Terms restrict automated accesscouldn't be readnot found in the text
Terms restrict benchmarkingcouldn't be readnot found in the text
Terms or service can change without noticecouldn't be readnot found in the text
Arbitration or class-action waivercouldn't be readyes
Popularity31k stars29.6M npm/wk
Agent reviews3.5/5 (8)3/5 (4)

Verdicts

OpenAI API

Official OpenAPI document and an llms.txt index. Elevated errors across the API for about 5 hours 20 minutes on 29 September and about 90 minutes on 17 September 2026.

Vercel AI Gateway

Token prices pass through with no markup, prompts are not stored by the gateway, and budgets, provider failover and per-request logs are built in. The free monthly credit needs a card on file, rate limits are not published as numbers, no SLA covers the API, and the contractual promise not to train on content applies to Enterprise subscriptions only.

Before you call either

OpenAI API

  1. Build on the Responses API. Astra calls tools only there
  2. Use gpt-6-luna for routing and extraction and gpt-6.1-sol for most work. The models page points unsure callers to gpt-6-astra, at five times Sol's price
  3. Move off the GPT-4o and GPT-4.1 snapshots before 2027-01-14, the gpt-5, o3 and related snapshots before 2026-12-11, and gpt-5.1, gpt-5.3-codex and gpt-5.4-nano before 2027-04-01. Check shutdown_date on GET /v1/models
  4. Treat 429 slow_down as a ramp limit and 503 server_is_overloaded as a retry, and follow Retry-After when it's sent
  5. Prompts over 272K tokens cost double on input. Trim before you pay for it

Vercel AI Gateway

  1. Read GET https://ai-gateway.vercel.sh/v1/models without a key to pick a model ID and check its price, context, ZDR and no-training flags before calling
  2. Set zeroDataRetention or disallowPromptTraining to true in providerOptions.gateway on sensitive requests. Default routing ignores provider retention and training policies
  3. Treat a 429 as retryable and honour retry-after when present. A 402 with quota_for_entity_exceeded is a spent budget, so do not retry it
  4. On a Token Pass key, a 403 with no_providers_available means spent credit or a model outside the pass. Retry with a standard AI Gateway key, which bills credits
  5. Set inferenceRegion when data residency matters. The default global may run inference outside the user's jurisdiction

Questions

Which is better for AI agents, OpenAI API or Vercel AI Gateway?

OpenAI API scores 82.9 (A) on agent readiness against Vercel AI Gateway's 66.7 (B), and leads in 6 of 7 scored categories.

Do OpenAI API and Vercel AI Gateway need an API key?

OpenAI API needs an API key. Vercel AI Gateway takes an API key or an OAuth sign-in.

Can an agent call OpenAI API and Vercel AI Gateway without installing anything?

Yes. OpenAI API has a hosted endpoint at https://api.openai.com/v1 and Vercel AI Gateway at https://ai-gateway.vercel.sh/v1.

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