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X420.ai

Credit packs

Buy GPT-5.5 credit like a simple online pack.

Choose an amount, pay once, and receive prepaid GPT-5.5 API credit. When discounted partner capacity is available, X420 can give you up to 50% more value.

Offer summary

Current X420.ai offers

The active X420.ai offer is prepaid GPT-5.5 API credit: 10€ paid buys 20€ official-value credit. A Claude Pro subscription offer at 50€ instead of 90€ is shown as coming soon and cannot be purchased yet.

Active offer
GPT-5.5 API credits
Example
10€ paid → 20€ credit
Disabled offer
Claude Pro coming soon
Checkout
Stripe for active credit packs only

Updated 2026-06-04. Pricing and availability can change with partner surplus supply.

Credit packs

Model available

GPT-5.5

A new class of intelligence for coding and professional work.

Reasoning

xhigh ready

none to xhigh

Speed

Pro work

code, agents, production

X420 price

-50%

$2.50 input / $15 output

$5input•$30output

Official reference pricing per 1M text tokens. X420 applies the prepaid credit discount below when partner surplus capacity is available.

Model guide notes

GPT-5.5 is positioned for complex professional work. Reasoning effort supports none, low, medium (default), high and xhigh.

Reasoning

none, low, medium, high, xhigh

Context window

1,050,000 tokens

Max output

128,000 tokens

Knowledge cutoff

Dec 01, 2025

Reasoning tokens

Supported

Pricing

Text tokens, per 1M tokens.

Official reference

Input
$5.00
Cached input
$0.50
Output
$30.00

X420 prepaid

-50%
Input
$2.50
Cached input
$0.25
Output
$15.00

X420 pricing is delivered through prepaid wallet credit: pay X€ + VAT and receive 2X€ of official-value GPT-5.5 API credit.

-50%
GPT-5.5 credit logo
Custom amount-50%

GPT-5.5 API

Choose any amount and receive discounted GPT-5.5 API credit up to 50%.

  • ✓Pay €X (+ VAT) and receive 2× the amount in GPT-5.5 API credit
  • ✓99.95% runtime and OpenAI-level response time
  • ✓No subscription, no monthly commitment
€20€10-50%

API credit value: €20 · pay €10

Claude Pro logo
Coming soon-44%

Claude Pro offer

A discounted Claude Pro plan is being prepared for X420 customers.

  • ✓Claude Pro access planned
  • ✓Target offer: €50 instead of €90
  • ✓Checkout opens when available

€50

instead of €90

How to use credits

01

We source surplus partner credits

Vetted partners sometimes have unused capacity. X420 purchases part of that surplus at a discount.

02

You buy prepaid API credits

You choose a pack and pay upfront, so there is no surprise invoice or runaway bill.

03

You get a capped API key

Create keys with spend controls and track usage from your dashboard.

04

Requests use the X420 proxy

Point your OpenAI-compatible SDK at https://api.x420.ai/v1 and use openai/gpt-5.5.

Start with a small pack.

Buy credit, create a capped API key, then add more credit only when usage grows.