Compare
Grok 4 1 Fast vs Openai Gpt 4o Mini
This page is context-first: how much text each model can take in one request. Full specs adds capabilities and limits; the pricing matrix below is only about $/million tokens from hosts that list both models.
Model
Grok 4 1 Fast
Context window
2M
2,000,000 tokens · ~1.5M words
Context window · side by side
Bar length is relative to the larger of the two windows (100% = max of this pair). This is not pricing.
Grok 4 1 Fast has about 15.6× the context window of the other in this pair.
Grok 4 1 Fast has 1462% more context capacity (2000K vs 128K tokens).
Quick verdicts
Short takeaways — validate with your own workloads.
Long document processing
Use Grok 4 1 Fast. Its 2000K context fits entire documents without chunking (vs 128K).
Full specs
Context, output, capabilities, and dates. Green highlights the favorable value where we compute a winner.
| Spec | Grok 4 1 Fast | Openai Gpt 4o Mini |
|---|---|---|
| Context window | 2,000,000 tokens (2000K) | 128,000 tokens (128K) |
| Max output tokens | 2,000,000 tokens (2000K) | N/A |
| Speed tier | Balanced | Fast |
| Vision | Yes | No |
| Function calling | Yes | No |
| Extended thinking | Yes | No |
| Prompt caching | Yes | No |
| Batch API | No | Yes |
| Release date | N/A | N/A |
Pricing matrix
Dollar rates only: hosts that list both models, per 1M tokens. For how much text fits, use the context section above — not this table.
| Provider | Grok 4 1 Fast in | Grok 4 1 Fast out | Openai Gpt 4o Mini in | Openai Gpt 4o Mini out |
|---|---|---|---|---|
| Gradient | — | — | — | — |
| Xai | $0.200/M | $0.500/M | — | — |
Frequently asked questions
Powered by Mem0
Use a smaller model.
Get better results.
Mem0 gives your AI long-term memory so you stop re-sending context on every call. That means you can use a smaller, faster, cheaper model — and still get better answers.
Example: a multi-turn chat session
80% less to send — works with any model