Current Context Window Sizes
| Model | Approx. Context Window |
|---|---|
| Claude Opus 4.8 / Sonnet 5 | 200K tokens |
| GPT-5 | 272K tokens |
| Gemini 2.5 Pro | ~1M tokens |
Bigger Isn't Automatically Better
See our Context Window page on the "lost in the middle" phenomenon — a larger context window doesn't guarantee a model uses every part of it equally well.
Checking Your Specific Fit
See our Context Window Calculator to check whether your specific document or conversation fits within these limits.
Related Pages
Frequently Asked
Which model has the largest context window right now?
Gemini 2.5 Pro currently offers among the largest at roughly 1 million tokens; check current model profiles since this changes with new releases.
Does a bigger context window cost more?
Not necessarily directly, though processing more tokens per request generally does cost more given token-based pricing.
Is context window size the most important factor for my task?
Only if your specific task involves very long documents or conversations; for most everyday tasks it matters less.
Where can I check if my content fits a specific model?
See our Context Window Calculator.