GPT-5.4 Pro vs Grok 4.20
A side-by-side comparison of two multimodal models — real specs, pricing, strengths and weaknesses, and a clear verdict on which to choose. Kept current by our agents.
Quick verdict: which should you choose?
Choose GPT-5.4 Pro if you need
- ✓Choose Grok 4.20 if you need a 2M token context window for extremely large inputs.
- ✓Choose Grok 4.20 if you need the lowest output price at $2.5 per million tokens.
- ✓Choose Grok 4.20 if you need documented high output speed of 132.31 tokens per second.
- ✓Choose Grok 4.20 if you need native multimodal integration of text, image, and file inputs in one model.
Choose Grok 4.20 if you need
- ✓Choose GPT-5.4 Pro if you need advanced reasoning over extended contexts for document tasks.
- ✓Choose GPT-5.4 Pro if you need strong integration of text, image, and file data in versatile workflows.
- ✓Choose GPT-5.4 Pro if you need handling of very large inputs across modalities despite higher cost.
Verdict
Grok 4.20 leads on measurable dimensions with a 2M token context, $2.5/M output price, and 132.31 t/s speed versus GPT-5.4 Pro's 1.05M context and $180/M price. GPT-5.4 Pro lists advanced reasoning and versatile document tasks among its strengths but provides no intelligence_index or speed data to substantiate superiority. Both models share identical modality limits (text/image/file only) and proprietary access.
GPT-5.4 Pro vs Grok 4.20: side by side
| Spec | GPT-5.4 Pro | Grok 4.20 | Winner |
|---|---|---|---|
| Intelligence | — | 37 | Tie |
| Output speed | — | 132 t/s | Tie |
| Output price | $180.00/1M | $2.50/1M | Grok 4.20 |
| Context | 1050K | 2000K | Grok 4.20 |
| Params | — | — | Tie |
| Provider | OpenAI | xAI | Tie |
Detailed analysis
Context Window
Winner: Grok 4.20Grok 4.20 provides a 2 million token context while GPT-5.4 Pro offers 1.05 million tokens. This gives Grok 4.20 the edge for extremely large inputs as stated in its strengths.
Pricing
Winner: Grok 4.20Grok 4.20 costs $2.5 per million output tokens compared to GPT-5.4 Pro at $180 per million. The nearly 72x price difference favors Grok 4.20 on cost efficiency.
Speed
Winner: Grok 4.20Grok 4.20 reports a specific output speed of 132.31 tokens per second while GPT-5.4 Pro lists no speed metric. Both note potential latency increases on maximum-length inputs.
Multimodal Capabilities
Winner: TieBoth models support text, image, and file inputs with no audio or video support. Grok 4.20 emphasizes native single-model integration while GPT-5.4 Pro highlights strong data integration and versatility.
GPT-5.4 Pro
Pros
- +Handles very large inputs across modalities
- +Strong integration of text, image, and file data
- +Advanced reasoning over extended contexts
Cons
- –Higher latency on maximum-length inputs
- –No native audio or video support
- –Proprietary access with usage constraints
Grok 4.20
Pros
- +Handles extremely large contexts up to 2M tokens
- +Native support for text, image, and file inputs
- +Multimodal integration in a single model
Cons
- –No audio or video modality support
- –Very large context can increase latency
- –Performance depends on input quality and structure
Summary: GPT-5.4 Pro vs Grok 4.20
Grok 4.20 is the clearer choice for cost-sensitive or maximum-context multimodal workloads based on its documented advantages in context size, price, and speed. GPT-5.4 Pro may appeal only where its listed advanced reasoning strengths align with specific unquantified needs despite the large gaps in available metrics.
Frequently asked questions
Grok 4.20 leads where data is available due to larger context, lower price, and known speed; GPT-5.4 Pro lacks comparable metrics.