GPT-5.5 Document Translation
GPT-5.5's 1M-token context window — about 2,100 pages — lets Belin Doc translate an entire contract, book or research paper in a single pass, keeping terminology and tone consistent from the first page to the last.
Why GPT-5.5 is built for document translation
1M-token context
Hold ~2,100 pages in a single context — translate whole documents at once instead of stitching together disconnected chunks.
128K-token output
Produce long, fully formatted translations in one response without truncation.
Higher token efficiency
More intelligent than GPT-5.4 at matching latency and better token efficiency — lower cost per translated page.
Knowledge to Dec 2025
Up-to-date terminology and domain knowledge for technical, legal and academic content.
Agentic accuracy
Top agentic-coding and reasoning scores (Terminal-Bench 2.0 82.7%, GDPval 84.9%) translate into precise handling of structured, domain-heavy documents.
One pass. Consistent terminology. No drift.
Traditional translators split a long document into chunks and translate each in isolation, so a term rendered one way on page 3 drifts on page 80. GPT-5.5 reads up to a million tokens at once, so it sees the whole document — every defined term, name and heading stays consistent end to end, and cross-references stay intact.
GPT-5.5 vs GPT-5.2 vs Gemini 3 for document translation
| GPT-5.5 | GPT-5.2 | Gemini 3 | |
|---|---|---|---|
| Context window | 1M tokens | 400K tokens | 1M tokens |
| Max output | 128K tokens | 128K tokens | 64K tokens |
| Best for | Whole-document consistency, agentic precision | Enterprise coding, 400K-context long docs | Multimodal, 1M context |
| API price (input / output per 1M) | $5 / $30 | $1.75 / $14 | $2 / $12 (Pro) |
Translate with GPT-5.5 in three steps
Upload your document
Drop in a PDF, Word, PowerPoint or other supported file — up to whole books.
Choose GPT-5.5
Pick GPT-5.5 as the translation model and select your target language.
Download the translation
Get a fully formatted translation with layout, tables and terminology preserved.
GPT-5.5 document translation FAQ
Common questions about translating documents with GPT-5.5 on Belin Doc.
GPT-5.5 has a 1M-token context window — roughly 2,100 pages — so most contracts, books and reports can be translated in a single pass without splitting.