Limited time

USD 20$217.60in account credit

USD 100$1,264.80in account credit

USD 500$7,112.80in account credit

Up to130%bonus

24d 11:51:11 left24d 11h left

See your bonus →
Fenno Fenno
+130% Top up more, get more 24 days left
Get started

Prepaid GPT API credit · Built for coding agents

Keep your coding agent running for the price of a coffee.

Use the full GPT-5.6 lineup from 7% of list price. Add the Base URL and API key to the tools you already use.

Drag right

Works with

Codex Claude Code Cline OpenCode Cursor VS Code cc-switch Hermes Agent OpenClaw Roo Code TRAE WorkBuddy

Fenno to date

0T+

Tokens processed

0M+

API calls completed

0+

Developers

0%+

Average cache hit rate

Plans

Subscribe for steady work or pay as you go when usage varies.

Option 1 · Subscription

Fixed allowance, fixed term

  • Weekly and monthly limits both apply
  • About 1.5–2× more usage than a standard top-up for the same budget
  • For regular development with predictable monthly spend

Option 2 · Account credit

Pay per token from your account credit

  • No billing cycle or usage cap; credit never expires
  • Top up any amount and spend it at the token rates below
  • For uneven usage: busy one week, quiet for the next three

Both options use the same models and token rates, and you can combine them: let a subscription cover everyday work, then use account credit for spikes. The two balances stay separate.

Trial

A 7-day trial for new users.

USD 1.99/ 7 days

Included credit $504%

OpenAI list price USD 50

You pay USD 1.99

Weekly ~$50

  • Valid for 7 days; one purchase per new user
  • Set up and verify the connection
  • Try light generation and agent tasks
Start trial

Mini

For light daily use. The first long-term tier.

USD 19.99/ 30 days

Included credit $20010%

OpenAI list price USD 200

You pay USD 19.99

Weekly ~$50 · Monthly ~$200

  • Light, steady usage
  • Good for completions and code explanations
  • Handle small editing tasks
Subscribe

Recommended

Solo

Daily development, first-pass PR reviews, and moderate agent usage.

USD 47.99/ 30 days

Included credit $5009.6%

OpenAI list price USD 500

You pay USD 47.99

Weekly ~$125 · Monthly ~$500

  • Covers completions, explanations, and refactoring
  • Enough for first-pass PR reviews
  • A natural step up from Trial or Mini
Subscribe

What you can count on

Refunds when you need them

Plans are refunded based on the days remaining. The paid portion of account credit can also be refunded at any time by contacting support. Trial is excluded.

No automatic renewal

It only renews if you turn on a recurring monthly or quarterly plan, which saves another 5%–10%.

Available right away

Plan credit, top-ups, and promotional bonuses are ready as soon as payment completes. No review queue.

Discounts are measured against OpenAI’s public list prices. See model pricing for each model’s reference price.

Limited-time offer

30-day developer boost

Top up your pay-as-you-go balance during the offer and get more credit for the same spend. Top-ups add up across the full campaign, so you do not need to fund it all at once. Bonuses arrive when each order completes.

Ends in

24days
11hr
51min
11sec

Aug 6 → Sep 5, 12:00 Beijing time
Aug 6 → Sep 5, 00:00 ET

USD

60%First 20

+$81.60

80%20 – 50

+$163.20

100%50 – 100

+$340.00

110%100 – 300

—

120%300 – 500

—

130%500 – 1,500

—

Each band earns its own bonus rate. Only the amount above a threshold moves to the higher rate. Drag the slider to see how your top-up is split.

Base credit

$680.00

Offer bonus

+$584.80

Total credit

$1,264.80

Top up in the console

Outside the offer, USD 100 gives you $680.00. During the offer, you also receive $584.80.

  • Only account-credit top-ups qualify. Subscription purchases do not earn a promotional bonus.
  • Bonuses start once cumulative top-ups reach USD 10 and apply up to USD 1,500.
  • Bonuses are issued as platform credit and cannot be withdrawn or transferred.

Models & pricing

One API key for every model.

gpt-5.6-luna

Light

Input · per 1M tokens

$0.20

Output$1.20
Cached input$0.02

For small tasks, fast responses, and the lowest cost per call.

gpt-5.6-terra

Default

Input · per 1M tokens

$2.00

Output$12.00
Cached input$0.20

The everyday choice for interactive work and agent coding.

gpt-5.6-sol

Flagship

Input · per 1M tokens

$5.00

Output$30.00
Cached input$0.50

The strongest reasoning for large codebases and long-running agent work.

Also available with the same key

gpt-5.5

Previous flagship

$5 / $30

Cache $0.50

gpt-5.4

Previous balanced model

$2.50 / $15

Cache $0.25

gpt-5.4-mini

Previous light model

$0.75 / $4.50

Cache $0.075

codex-auto-review

Code review

$5 / $30

Cache $0.50

Output · per 1M$1.20
Cached input$0.02

For small tasks, fast responses, and the lowest cost per call.

Output · per 1M$12.00
Cached input$0.20

The everyday choice for interactive work and agent coding.

Output · per 1M$30.00
Cached input$0.50

The strongest reasoning for large codebases and long-running agent work.

Output · per 1M$30
Cached input$0.50

Output · per 1M$15
Cached input$0.25

Output · per 1M$4.50
Cached input$0.075

Output · per 1M$30
Cached input$0.50

Model prices use platform credit ($), with 1 USD = $6.8. Even standard pay-as-you-go usage works out to 15% of OpenAI’s list price. During a top-up offer or on the best-value subscription, it can be as low as 7% .

Setup

The config files look different, but each tool needs the same three values: Base URL, API key, and model name.

Swipe sideways to view the full config →

~/.codex/config.toml · ~/.codex/auth.json
# ~/.codex/config.toml
model_provider = "OpenAI"
model = "gpt-5.6-sol"
review_model = "gpt-5.6-sol"
model_reasoning_effort = "xhigh"
disable_response_storage = true
network_access = "enabled"
model_context_window = 1000000
model_auto_compact_token_limit = 900000
[model_providers.OpenAI]
name = "OpenAI"
base_url = "https://api.fenno.ai/v1"
wire_api = "responses"
requires_openai_auth = true
# ~/.codex/auth.json
{
"OPENAI_API_KEY": "sk-fenno-xxxxxxxx"
}
TOML + JSON 20 lines 4 lines highlighted — these are the only ones to change

$ codex "refactor auth middleware, keep tests green"

✓ 14 files changed · 38 tests passed · Cost for this run USD 0.41

Supported APIs: OpenAI Chat Completions and Responses, plus Anthropic Messages. Most AI coding tools and agent frameworks use one of these, so changing the Base URL is enough to connect.

Before you pay

Answers before you get started.

Use leading models for less than one-tenth of the cost.

USD 1.99 gets you $50 in API credit for gpt-5.6-sol and other leading models. Add the Base URL and API key to connect the agent you already use.

One per new user · No automatic renewal · Credit available immediately

What $50 in credit can do

340+

agent tasks

About 68M

tokens

GPT-5.6

All models included

Create an account → copy your key → add it to your tool. The estimate assumes 200K tokens per task, a 90% cached-input hit rate, and the gpt-5.6-sol list price.