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Immersive Translate is a strong browser extension for webpage translation, bilingual reading, text-selection translation, and document translation. For Crazyrouter, the most reliable route is the extension’s officially supported OpenAI service path, using the More Settings section to enter a custom API address.

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Overview

With Immersive Translate’s OpenAI service setup, you can send requests to Crazyrouter with:
  • recommended protocol: OpenAI-compatible API
  • service type: OpenAI
  • API key: your sk-...
  • custom API URL: https://crazyrouter.com/v1/chat/completions
  • recommended first validation model: gpt-5.4
The most important difference between Immersive Translate and ChatBox is this: here you should usually start with the full endpoint path, not just the root domain.

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Why This Guide Uses The Full Endpoint Path

According to Immersive Translate’s official OpenAI service docs, the extension supports customizing the OpenAI API address in More Settings. For Crazyrouter, the safer first-pass value is therefore: 
https://crazyrouter.com/v1/chat/completions
Do not start by entering only the root domain such as https://crazyrouter.com, and do not stop at /v1. For Immersive Translate’s OpenAI-style path, the safest first validation is the full /v1/chat/completions endpoint.

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Best For

  • users who want high-quality AI webpage translation
  • users who want Crazyrouter-based control over translation costs
  • users who want separate budgets by browser or device
  • users who prefer an OpenAI-compatible route for a browser translation extension

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Prerequisites

ItemNotes
Crazyrouter accountCreate one at crazyrouter.com
Crazyrouter tokenCreate a dedicated token for Immersive Translate
BrowserChrome, Edge, Firefox, or another supported browser
Immersive Translate extensionUse a current stable release
Allowed modelsAllow at least one translation-friendly model
Suggested starter allowlist:
  • gpt-5.4
  • claude-sonnet-4-6

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Install And Setup Path

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Chrome / Edge Path

  1. install Immersive Translate from the extension store
  2. open the extension settings
  3. go to Translation Services
  4. choose OpenAI
  5. open More Settings
  6. enter the Crazyrouter key and full custom API URL

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Firefox Path

  1. install Immersive Translate from Firefox Add-ons
  2. open the settings page
  3. go to Translation Services
  4. choose OpenAI
  5. open More Settings
  6. enter the Crazyrouter settings

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Detailed Setup

1

Step 1: Install the extension

Install Immersive Translate from the official extension store for your browser.
2

Step 2: Create a dedicated Crazyrouter token

For the first pass, allow only:
  • gpt-5.4
  • claude-sonnet-4-6
Do not start by allowing a wide model set in a translation scenario.
3

Step 3: Open the OpenAI service configuration

In the extension UI, go to:
  • Settings
  • Translation Services
  • choose OpenAI
4

Step 4: Enter the API key and custom URL

Fill in:
  • API Key: your sk-...
  • Custom API URL: https://crazyrouter.com/v1/chat/completions
  • Model: start with gpt-5.4
If some fields are hidden by default, expand More Settings first.
5

Step 5: Lower the request rate for the first pass

Immersive Translate’s official OpenAI docs explicitly warn about rate limits. On the first Crazyrouter validation, keep the request rate conservative, especially for long webpages or ebooks.Safe starter pattern:
  • keep requests-per-second low
  • validate with a small page or selected text first
  • only raise the rate after the setup is already stable
6

Step 6: Run the smallest practical validation

Recommended order:
  1. translate a short selected paragraph
  2. translate a short webpage
  3. only then try full-page or longer-document translation
That makes it much easier to tell whether the issue is config-related or simply request-volume-related.
Use caseRecommended modelWhy
first-pass minimal validationgpt-5.4verified successfully in production on March 23, 2026, and best for proving the OpenAI-compatible route works
higher-quality translationclaude-sonnet-4-6better for long-form explanation, refinement, and more quality-sensitive content
Gemini fallback pathgemini-3-pro-previewuseful as a second compatibility-validation path after the baseline is already stable

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Token Setup Best Practices

SettingRecommendationNotes
dedicated tokenRequireddo not share browser translation tokens with IDE or CLI tools
model allowlistStrongly recommendedstart with only 1 to 2 translation models
quota capStrongly recommendedfull-page and ebook translation can spend much faster than normal chat
device splitRecommendedseparate tokens by browser or machine if needed
leak responseRotate immediatelyrecordings, screenshots, or browser sync leaks should trigger a key rotation

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Verification Checklist

  • the extension is installed correctly
  • OpenAI is selected as the translation service
  • API Key is entered correctly
  • Custom API URL is https://crazyrouter.com/v1/chat/completions
  • the first model is gpt-5.4 or another allowed model
  • a short selected paragraph translates successfully
  • a short webpage translates successfully
  • Crazyrouter logs show the matching request

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Common Errors And Fixes

SymptomLikely causeFix
404the API URL is missing /chat/completions, or only the root domain was enteredswitch to the full https://crazyrouter.com/v1/chat/completions URL
401 unauthorizedwrong, expired, or incomplete API keygenerate a new token and paste it again
403 or model not allowedthe token does not allow the selected modelallow that model in Crazyrouter token settings
429 or unstable behaviorthe request rate is too highlower the request rate and validate on smaller text first
long pages fail more oftenconcurrency or rate is too highreduce scope first, then increase gradually
cost rises too fastyou started with full-page or full-document translation immediatelybegin with gpt-5.4 on a smaller scope first

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Cost Tips

  • default to gpt-5.4
  • translate selected text first instead of full pages immediately
  • sample long content first before translating all of it
  • if you install the extension on multiple browsers, separate the tokens for cleaner cost tracking

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FAQ

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What API URL should I enter in Immersive Translate?

Use the full path: https://crazyrouter.com/v1/chat/completions.

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Why is this different from ChatBox, where the guide starts from the root domain?

Because Immersive Translate’s official OpenAI custom-address path is better aligned with a full endpoint URL, which makes the first validation more reliable.

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Which model should I try first?

Start with gpt-5.4.

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Why not translate full pages or ebooks immediately?

Because that amplifies configuration mistakes, rate-limit issues, and cost at the same time. Small text first is the fastest debugging pattern.
If your goal is to manage browser AI translation cost through Crazyrouter, Immersive Translate is one of the most important browser-extension guides to keep detailed and accurate.