Compare
GPT-5.4 Pro vs Grok 4.5
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
GPT-5.4 Pro
Context window
1.1M
1,050,000 tokens · ~788K 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.
GPT-5.4 Pro has about 2.1× the context window of the other in this pair.
GPT-5.4 Pro has 110% more context capacity (1050K vs 500K tokens).
Quick verdicts
Short takeaways — validate with your own workloads.
Long document processing
Use GPT-5.4 Pro. Its 1050K context fits entire documents without chunking (vs 500K).
Full specs
Context, output, capabilities, and dates. Green highlights the favorable value where we compute a winner.
| Spec | GPT-5.4 Pro | Grok 4.5 |
|---|---|---|
| Context window | 1,050,000 tokens (1050K) | 500,000 tokens (500K) |
| Max output tokens | 128,000 tokens (128K) | N/A |
| Speed tier | Balanced | Balanced |
| Vision | Yes | Yes |
| Function calling | Yes | Yes |
| Extended thinking | Yes | Yes |
| Prompt caching | No | Yes |
| Batch API | No | No |
| Release date | Mar 2026 | Jul 2026 |
Frequently asked questions
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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