GPT API Relay
GPT at a fraction
of the official price
New-user trial from ¥19.9 · 30-day term
Works with Codex, Cursor, and any OpenAI-compatible client · full streaming and tool-call support
GPT is great.
The bills are brutal.
Official GPT APIs charge by the dollar — one overnight agent run costs as much as a nice dinner. FlatRouter pools GPT subscription capacity at scale, then bills at official model prices times a platform billing factor, with no stacked hidden multipliers. Same GPT interface, same streaming and tool calls, on a monthly plan from ¥19.9.
01Cheap
Prices, genuinely
driven down
Pooled GPT subscription capacity spreads fixed costs across thousands of requests. Usage is billed at official model prices times a platform billing factor — no stacked hidden multipliers — so Starter through Ultra land around ¥0.45–0.58 per $1 of official usage.
GPT-5 · per $1 of official usage
Starter–Ultra effective rate, from billing credit ÷ 7
02Stable
Multi-pool redundancy,
automatic failover
Requests spread across GPT account pools in multiple regions, scheduled by live health scores. When a node gets rate-limited it's instantly circuit-broken and cooled down while traffic shifts to the next healthy one — your agent runs till dawn without dying on a 3 a.m. 429.
Routing log · live
14:02:11POST /chat/completions→ pool-us-03
14:02:13POST /v1/responses→ pool-us-01
14:02:14429 rate limitedpool-us-03 cooling 60s
14:02:14POST /chat/completions→ pool-eu-02
14:02:16POST /v1/responses→ pool-eu-02
03Simple
Migrate in
two lines
Fully compatible with the official OpenAI protocol, no lossy translation: streaming, tool calls, and vision all work as-is. Codex, Cursor, or your own code — point the base_url here and you're migrated. Switch back anytime.
Migration · two lines
# Codex / Cursor / any SDK
export OPENAI_BASE_URL=\
https://api.flatrouter.com
export OPENAI_API_KEY=\
sk-flatrouter-****Pricing, laid out in the open
Effective input cost per 1M tokens on the Advanced plan. Usage is billed at official model prices times the platform billing factor — no stacked hidden multipliers.
| Model | Official | FlatRouter | That's |
|---|---|---|---|
| GPT-5 | $1.25 | $0.095 | |
| GPT-5 mini | $0.25 | $0.019 | |
| Claude Opus 5 | — | — | |
| Claude Sonnet 5 | — | — |
GPT-5 figures use the Advanced plan effective rate. Full list in the console.
Monthly GPT plans
Billed at official model prices times the platform billing factor — no stacked hidden multipliers. Credit is a prepaid billing allowance for the 30-day term.
Trial
¥19.9
≈ $2.93 via Stripe
¥19.9 → ¥700 credit · new users, one-time
30-day term · unused credit is forfeited at term end
Claim trialStarter
¥99/mo
≈ $14.56 via Stripe
For side projects and a first taste.
30-day term · unused credit is forfeited at term end
Get startedStandard
¥299/mo
≈ $43.97 via Stripe
Daily driver for solo builders.
30-day term · unused credit is forfeited at term end
Get startedPro
¥999/mo
≈ $146.91 via Stripe
Agents running around the clock.
30-day term · unused credit is forfeited at term end
Get startedUltra
¥1,999/mo
≈ $293.97 via Stripe
Highest GPT pool allowance.
30-day term · unused credit is forfeited at term end
Get startedNeed more than Ultra? Volume deals for teams — talk to us.
Prices are shown in CNY and charged in USD via Stripe at the rate shown on this page. Your card issuer may apply a different rate and may charge foreign-transaction fees. Plan credit is a prepaid billing allowance for API usage on FlatRouter — it is not cash, cannot be withdrawn or transferred, and unused credit is forfeited when the term ends. Usage is metered at official model prices times the platform billing factor shown above.