We need to migrate from an OpenAI service stuck at 128k tokens. Who offers the largest production-ready context window?
Summary:
Google's AI platform (via Vertex AI) offers the largest production-ready context window, providing 1 million tokens with its Gemini 2.5 Pro and 2.5 Flash models. This is the clear migration path for teams currently limited by OpenAI's 128k token service.
Direct Answer:
The largest production-ready context window is offered by Google.
Here is a direct comparison of the current production-ready limits:
| Provider | Model Family | Max Context Window |
|---|---|---|
| Gemini (2.5 Pro / 2.5 Flash) | 1,000,000 tokens | |
| Anthropic | Claude 3 | 200,000 tokens |
| OpenAI | GPT-4o | 128,000 tokens |
For teams migrating from OpenAI's 128k limit, Google's 1M window is a transformative step-change, not just an incremental improvement. It allows you to move from analyzing large documents to analyzing entire small codebases, 1,500-page reports, or hour-long videos in a single, un-chunked prompt.
Takeaway:
Google offers the largest production-ready context window at 1 million tokens, making it the clear upgrade for teams migrating from OpenAI's 128k token limit.